Sunday, December 10, 2023

Bricklaying work is competitive.

WELCOME TO FRANK MENCHISE BLOG OF GENZANO DI LUCANIA, YOU ARE INVITED TO BROWSE AS LONG AS YOU LIKE. We are also writing several blogs about the Australian housing problems, to read all the blogs of this selected group about rentals click on this link, http://menfranco.blogspot.com, 
Now, let me paste of few links of my other blogs. 

This blog can be found in full at this link, Bricklaying is competitive


Brickwork and Blockwork is a hard job to do, because most times people are paid according to how many bricks or blocks they can lay in one day. So, it is a very competitive job. Anyhow, we will explain all this is this article. Here I want to add, that this is how we were working un the past, when we were building many affordable houses.     


Welcome to our article, Bricklaying is competitive. 

Building workers need to be competitive;

It is a well-known fact that whatever we do in life, we need to be competitive these days, therefore we would like to do it better and faster than somebody else. Most people have this inborn need to excel in whatever we do; and those that don’t fall in this category, because they don’t care to do better usually they become losers, so, we are forced to act one way or another. For these reasons, we always try to challenge ourselves; we have to do that to be successful in life.

This need to do things better and faster also applies to the building industry, because the building industry needs to be competitive, perhaps to a higher degree than other industries, therefore it is very important that we would be able to build better and cheaper houses, because that is the only way that the buyers would be able to afford them, whatever they are houses or apartments, and then, when they are sold, the builders could build another one to sell again, since the builder needs money to build houses.

As we have said, we know that in whatever activities we are able to perform, we would like to do that better and faster, so that we can beat our competitors; so, all the trade people that work in the building are constantly looking for ways to improve their output; you see a tradesman needs to perform well, if he is going to be employed from a builder or contractor, because he needs to perform well to earn his wage and a bit more for his employer. So, if you are a bricklayer you must be able of laying a certain number of bricks or blocks per day before you would be employable, of course this can vary greatly depending on the job that needs to be done.

Now, in some of our previous building articles we have talked about brickwork, we have started with, DIY brickwork,  then we have written  Building a brick base, and then  House brick base continues, so, we have talked about a fair bit how to lay bricks in these three articles, anyhow these three articles were written to show some people, how to lay bricks and how to go about building this brick base, of course we have also pointed out how to lay more bricks by using bricklayers’ profiles and other things, but the aim was mostly for people that were not real tradesmen. But what we are writing here-under is for more advanced builders.  

For the block layer tradesman. 

Now, this sub-article here, we are writing it for the block-layer tradesmen, because we would like the block layer tradesmen to challenge themselves and see if what we are claiming here could be done more than just a few times; of course, to do that, we are going to show you how you could lay more Besser blocks in one day that you did before, but you need to follow some rules that we have found helpful ourselves. In this example we are going to make it easy and we are going to talk only about straight forward work, otherwise it is going to be very hard to achieve and also to explain or measure what we want to do.

As we all know, for the bricklayer to lay blocks is even harder than laying bricks, because the blocks are heavy, each block needs to be lifted with both hands and carefully placed softly on the mortar bed that the block layer has laid, so it is hard to lay many blocks in one day, but there are ways to make it a bit easier and a block layer could be able to lay up to 250 in one day, when the job is easy enough to do; so let us see how that could be done.

Now it is necessary to explain to the public, what happens in the building industry and how many bricks or blocks a tradesman is supposed to lay in one day. In the building industry the best tradesman would exaggerate a bit their capacity of laying so many bricks or blocks per day, so, we go around boasting that we are able to lay 1000 common bricks, or over 500 face bricks, or 200 eight inches Besser blocks in a single day. Here we need to say that perhaps we have done it once or twice ourselves, and we want to boast about it, as if we could do it every day; but really that is hard to achieve, anyhow if you have been able of laying down that many bricks or block even one time in your life, you are a very good tradesman. Now the reality is that on average, when we work on houses or small building at the end of a job the figure could be half of what we are boasting about. Now that we have explained that let us see how we could do even better. 

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Laying 250 Besser blocks in one day:

Now, let us forget about the average number or bricks or blocks that can be laid in one day, and let us concentrate on what we have said above, where we were able to lay 200 Besser block in one day and that is very hard even for a good tradesman, so, since we claim that we are going to be able to lay 250 eight inches blocks in one day, we need to explained it clearly, how it could be done, and that is what we are going to do just now here under:

In order for a block layer to be able of laying 250 blocks in one day, everything and every movement should be planed, so that there is no waste of time and energies. So, how could we achieve those 250 numbers of blocks to be laid is explained here under. 

Now, to do that, it should be a straight forward job, let us say the walls are long and you are on a level platform, let us assume that we are working on a concrete slab, so the place is level and there is plenty of room to move around, the walls have been marked where they should be, so all you have to do is to lay these eight inches’ blocks. Now to do this job efficiently it required team work, so, if you are the block layer, you need to instruct your labor how you want to set up your mortar board and the blocks that you should lay.

Ideally you want the mortar boards to be set off the ground, so, the labour should put a couple of blocks on the slab and set the mortar board on them, they need to be set at least two feet from the wall and about 6 to 8 feet apart, you see here you want to give more room to the labour for the blocks; then instruct you labour that when he brings the blocks he should set the blocks between the mortar boards standing up, so that you don’t have to handle the blocks many times; this is how the labour should set everything up. But what’s about you the block layer; what do you need and how you proceed to lay those 250 blocks.

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The block layer procedure. 

The block layer first of all lays one block in each corner; and then he stretches his bricklayer line between these two blobs and lays the first course of blocks as usual making sure that all blocks are straight and have an even vertical joint, if everything is done the correct way, because the blocks have been made to cover 400 mm each in the wall, but their true length is 390 mm, if you measure the wall it should be an even number divisible by 100 mm and minus 10 mm. So if a wall is 10 metres long and you follow this rule strictly, you will end up with a wall 9.990 meters long, of course this could easily be adjusted from the block layer by making a few joints bigger or smaller as required.

The reason why, we have written about these lengths above is that we want to point out to some people that want to lay blocks themselves how to work with blocks, so, let us explain it in another way: when we work with blocks it is a lot easier for us to follow the gauge, because they have been made to cover an even number when laid, so, a 200 series block is 390 mm long 190 mm wide and 190 mm high, but when laid in the wall because we have to add the mortar joint it covers 400 mm in length and 200 mm high, so this is the gauge that needs to be kept, of course sometimes the length in the building do not work with the length of the blocks and this may cause a few problems; but whatever problems there might be, it is advisable that you don’t try too hard to adjust it by making the joints too big or too small; you can try to make the bed and vertical joint smaller if possible and it is still going to be a good job done, but if you try to make them bigger it becomes very unsightly.  

Of course, now we need still to write how a tradesman block layer could be able to lay 250 blocks in one day, in order to lay that many blocks he must set everything the right way from the start, so, let us describe how that could be achieved. We have mentioned above a wall about ten meters long, but it could be any length as long as it is not very short you can use the following method. After laying the first course of blocks you build the two corners, say four blocks high and you set your bricklayer line on these corners. Now make sure that your labour has brought the blocks and placed them between the mortar boards standing up us we have described above, this will save you the bricklayer to lift the blocks in that position before you place the mortar on them for the vertical joints.

Okay, everything is ready to go, tell the labour that he can wet the boards and fill them with fresh mortar; now pick up a plaster hawk and your bricklayer trowel, fill up the hawk from the mortar board and start laying the mortar on the block ribs on both sides, you see the blocks ribs are narrow and you cannot use a full trowel of mortar straight from the board, well you can but it is going to be hard to drop the right amount of mortar on the ribs, so by using the hawk you can pick up a small amount of mortar from it and place is straight on the block ribs, by doing this you will be able to lay your mortar bed a lot faster without bending to many times, so you can save time and energy, it is up to you if you lay the mortar bed for the entire course, or only part of it, it may depend on the length of the wall and other factor, and a good bricklayer knows what to do just by observing a few things; now that you have laid the mortar bed place some mortar for the vertical joint on the blocks that are already standing up, then leave your hawk and trowel on the mortar board; you see you have to leave these tools there because you need both hands free to lift up the blocks, here you have a choice, you can lift just one block carefully lay it on the mortar without squashing it  and tap it into position with your trowel and when necessary even a hammer, now you can lift one block at a time and tap it into position, or a few blocks and then tap them into position, it is up to you whichever way you prefer.

Anyhow, what we have written above is how you could be able to lay more blocks with less effort, it is worth to try, as we have tried it and it works. I hope that I have been able to explain this procedure clear enough for our readers to follow. 

This is all for this article, see you in our next article,  D.I.W. house repairs

To see more click on this link, Bricklaying is competitive

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Friday, September 15, 2023

Mix your own cement, part two

WELCOME TO FRANK MENCHISE BLOG OF GENZANO DI LUCANIA, YOU ARE INVITED TO BROWSE AS LONG AS YOU LIKE. We are also writing several blogs about the Australian housing problems, to read all the blogs of this selected group about rentals click on this link, http://menfranco.blogspot.com, 
Now, let me paste of few links of my other blogs. 

This blog can be found in full at this link, Mix your own cement



To make concrete even stronger, you need to use steel rods or mash, and place it in the right position, before you place the concrete, this picture above shows you one exsample. But we must say that usually there are plans to show you what steel to use, and how. hereunder is a link that will help you inderstand some of these issues. 

 How to Make Concrete Even Stronger: 6 Steps (with Pictures)

 

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Welcome to our blog, Mix your own cement. part two.  

As we have said before, because this article was too long, we have split it, and this is part two, so, to make sense, you should keen in mind what we said in part one, and follow. 

 

Mixing mortar, plaster, or cement topping.

Anyhow, in part one we have described how to mix concrete by hand and by using a mixer, the same ways can be used to mix mortar and/or hard plaster or cement topping etc. So now, we do not need to explain step by step how to mix them, but we will describe only the different amount of things that are used; but try to remember that when you mix by hand, it is a lot easier to mix the dry materials first and then add water, but when you use the mixer it usually is better and quicker to start with the water first.

To mix mortar for the bricklayer.

Just by using brickies loams and Portland cement, this mixture by volume is most likely 4 part brickies loams to one part Portland cement, but it could vary from (3 to 1) to (6 to 1) the aim here is to give the bricklayers what is easy to work with, and at the same time you don’t want to make the mortar a lot stronger than the bricks when it dries, and you don’t want to make it too weak for the job you are doing, so, it makes sense to see what the bricklayer reckons is good enough for the job; sometimes when making mortar you can replace part of the Portland cement with hydrated lime, plus other things to make the mortar easy to work with.

Mortar for cement blocks

The mortar for cement block is usually three parts fine plaster sand and one-part cement, it is a bit different from the brickie’s loams, as it is thicker and stronger and very close to the block’s colours when dry.   

To mix cement plaster to plaster walls.

This mixture is usually 3 parts plaster sand and 1 part Portland cement, in some countries where lime is easier to have than cement it can be made by using a mixture of lime and cement for the interior, we believe that there are a lot of old places that they have used lime only, the cement mixture is used wherever it is too wet.

Cement topping.

This mixture is usually 3 parts river sand to 1 part Portland cement; it can be used straight on the cement if it is still green, but when the cement is dry you need to make sure it is clean and rough for the cement to bond, you may have to use tools to indent the existing concrete, then you have to wet the cement and also you may need to use some cement bounding agent and/or paint to concrete with this cement glue called Weldbond or  Bondcrete or whatever and place the topping cement according to the instruction supplied, if these concrete glues are not available, you have to wet the concrete that you have to lay the topping on, then make some slur of water and cement and somehow work it in with a brush as if you paint the concrete, and before this starts drying lay your topping on it. 

These three mixtures plus the concrete are the main things that are required when we build with cement, of course, for those people that do not know how the different materials look like, is still hard to understand the hole procedure, but if they read a few times what we have said, they should have a fair idea of what we are talking about. Anyhow, I have described several things already, but I think that I need to describe how to mix mortar with lime only, as it was done in the old days and here I am not talking just hydrated lime that you can buy at the hardware store, but I am talking about quick-lime as it comes from the kiln and slacked lime. 

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Lime use in building.  

Quick-Lime and slacked or hydrated lime

Today when we talk about lime, we see a bag of white powder that we buy at the hardware store, we know that we can use this powder to replace some cement when we make mortar, but we don’t know much more than that, But lime is a lot more than just a white powder in a bag, because lime is one of those materials that has been and is being used a lot in many ways, its’ largest use is in making mortar for the master builders, but it has other uses also. So, let us talk about lime and where it comes from, so that we can understand its several uses, of course, here we are mainly interested about its use in the building industry for making mortar etc. But there is more to say about lime, but before we do that let us check out how the Wikipedia explains quick lime etc. Where you can find a lot of information about lime if you care to know, click on the links.

Slaked or Hydrated Lime

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From the Wikipedia:

   Calcium oxide (CaO), commonly known as quicklime or burnt lime, is a widely usedchemical compound. It is a white, caustic, alkaline crystalline solid at room temperature. The broadly used term "lime" connotes calcium-containing inorganic materials, which include carbonates, oxides and hydroxides of calcium, silicon, magnesium, aluminium, and iron predominate, such as limestone. By contrast, "quicklime" specifically applies to a single chemical compound.

Quicklime is relatively inexpensive. Both it and a chemical derivative (calcium hydroxide) are important commodity chemicals.

   Calcium oxide is usually made by the thermal decomposition of materials such aslimestone, that contain calcium carbonate (CaCO3; mineral calcite) in a lime kiln. This is accomplished by heating the material to above 825 °C (1,517 °F),[5] a process calledcalcination or lime-burning, to liberate a molecule of carbon dioxide (CO2); leaving quicklime. The quicklime is not stable and, when cooled, will spontaneously react with CO2 from the air until, after enough time, it will be completely converted back to calcium carbonate.

Annual worldwide production of quicklime is around 283 million metric tons. China is by far the world's largest producer, with a total of around 170 million metric tons per year. The United States is the next largest, with around 20 million metric tons per year.[6]

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As we have said, lime has been used for a very long time its use could be prehistoric, nobody seems to know when it was first used in making mortar and plaster for buildings and for other things, it was/is used even to disinfect places, when there is no much else to use, and I know that there is a lot more to say about the use of lime even today; up to the time when I was young it was used even to whitewash the walls in spring once a year, after a long winter all the walls were darkened with smoke, because if you wanted to keep warm you needed to light a fire in the chimney, so, the smoke of the fire would find the way into the rooms instead of going all up the chimney, I am pretty sure that even today this is the cheapest way of cleaning rustic building, as, it is one of the cheapest ways to make everything clean. But let us tell you it’s use as a building material to make mortar.

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From quick lime to hydrated lime. 

From quick lime to slacked lime the old ways

Here we are talking about the late forties and early fifties, when I was young learning what was happening around me, so, hereunder we will be writing about what I saw and learned at that time about lime products and its uses. 

In the town where I come from in southern Italy; in the early fifties when there was a new building to be build or alterations to existing buildings to be done, one of the first things we would see was that the master builder would get ready a good supply of slacked lime, because this was one of the most important building materials, he needed to do the job. In those times bagged hydrated lime and cement was very expensive, and bagged cement has a short life shelving span, as it reacts when humidity infiltrate the bags, therefore, most people or builders that needed to build used lime wherever they could; they would buy quick lime and get it process immediately on delivery themselves or with the help of the people that delivered it, of course, one needs to know how to do that, because it is dangerous while you are doing it. Now, let us see how it was done, and then we will tell you where else the lime was used.

Anyhow, the master builder before delivery had to build a square wall like a box, and in this large box he would process the quick lime, because the quick lime cannot be held the way it is for any length of time, because it reacts to humidity and violently to water, so, it is necessary that it is turned into slacked lime as soon as possible after delivery.

 Okay, the cart or the lorry is on the way, so, the master builder gets his worker to start filling the pit with water, and when the quick lime arrives they start carefully throwing this burned lime stones into the pit in very small quantities, as soon as the quick lime comes in contact with the water it reacts and the water starts boiling, everybody is banned to approach the pit accept the people that must work there, and they ware some protective gear, because it is dangerous to handle quick-lime and around the pit, this process goes on until all the quick lime is thus treated, once they have done that it is left to cool down for a few days; after it has cooled down it is a lot less dangerous, but still you need to be careful near the lime pit. You see, the lime pit is now filled up with slacked lime, which looks like curd when you make cheese, but it is still dangerous and it can easily kill you if you fall in it, its contend must be handled with caution, but anyhow the slacked lime is now ready to be used, this is how the builders used to get ready the lime to make mortar. Now to use this lime to make mortar is different from using bagged hydrated lime or cement; so, we are going to tell you how to make mortar with slacked lime.

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How to make mortar with slacked lime. 

This is how I know it was done in the old time, perhaps for thousands of years, anyhow, let me describe the procedure. Let us suppose that you have the slacked lime in the pit or in a container; you have brickies loams or fine sand, so, let us start:

Start by making a hip of your sand on a platform; now that you have done that, make a well in the centre and place your slacked lime in it. The quantities in here may vary a lot more than when we use cement or hydrated bagged lime, because the slacked lime can be as liquid as thickened cream to as compact as feta cheese, so, you have to learn as you go about the quantities, but if you have mixed mortar before, you soon work it out yourself, or if there is any tradesman that is going to use the mortar he can tell you just by looking at the mortar being done, whether you need more lime or more sand and water etc.

Okay, now that you have the lime in the middle of the sand, with a Larry start pushing this devise up and down through the lime by adding a bit of water as needed and slowly mixing some sand with the lime; you need to do this until you have mixed the whole lot evenly. This is hard work but that is how it was done when there were no mixer and no bagged hydrated lime around.

Here we need to note that this mixing of slacked lime to mix mortar is completely different from mixing other mixture, because the slacked lime is already wet, and it is like a paste.

Now, let me talk about, lime use in farming.

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Lime use in farming. 

You know, lime is a very useful commodity, in fact they are countless places where we can use it, I only happen to know a few of them, so, let me say a few things about how we were using lime in our small family farm at the time when I was young, just the way I remember it:

We would use it like the builders use it when we had to repair or replace a few stone that were falling apart in the old stone building, so, instead of using clay like the first time, we would mix a small quantity of mortar using lime and sand; then, we used lime to whitewash the farm house, the stables, the pig stay, the chicken coop and sheds or other buildings near the farm house once a year in spring.

We could use it to disinfect stagnant water ponds that showed signs of vermin, or the water were too dirty, so, we would dilute some lime in water and then pour it in the water ponds, and next day the ponds would be clean, as the lime would kill the vermin and would make the water clear because all the dirt would sink to the bottom of the pond; you see, in our small farm we used to have a kitchen garden, so, we would dig up a few ponds beside the garden that would feel up with water during winter or when it rained, we used this water to water the plants when the soil was becoming too dry for the garden plants to grow.

In the farms of those days lime was also used to spray vines and trees, sometimes there were diseases that could be controlled by applying a coat of lime to the trunk of those trees; but there is one thing that always comes to my mind; it is when we were spraying the grape vines with a copper sulphate and lime, we would have two containers one with diluted copper sulphate and one with diluted lime, some people used to spray first with copper sulphate and then with lime, so that they would help each other to kill the mildew, but my grandma had worked a way how to avoid this double spraying and it worked thus;

In those times it was not like today and even the vine spraying pump was a devise that you would put on your back, and with a handle that you moved up and down you would spray your vines and trees as well; this devise could hold about three gallons of liquid, so, every now and then you needed to fill it up; as I have said we had two containers one holding diluted copper sulphate and one with diluted lime; (of course you had to know how much diluted you had to do your mixtures but that does not mutter here this time) anyhow, when the pump was/is empty you would go to these containers to fill it up: here is my grandma way to avoid to spray twice, when filling the pump, first of all you had to make sure than the mixture were well stirred, then you would put the copper sulphate in the pump and at the last minute you would add the lime, and immediately start to spray. This was my grandma way and it worked because the mixture would not have time to settle down and become stale. There you are this is just another way of how lime is useful in the farms.

Anyhow, I think that this article is too long, and I have said enough about how to mix your own cement or mortar, about lime and lime use in farming, so, see you next time with our article, Bricklaying is competitive

To see more click on this link, Mix your own cement..  

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Wednesday, August 16, 2023

Mix your own cement, part one.

WELCOME TO FRANK MENCHISE BLOG OF GENZANO DI LUCANIA, YOU ARE INVITED TO BROWSE AS LONG AS YOU LIKE. We are also writing several blogs about the Australian housing problems, to read all the blogs of this selected group about rentals click on this link, http://menfranco.blogspot.com, 
Now, let me paste of few links of my other blogs. 

This blog can be found in full at this link, Mix your own cement


To mix your own cement, you need building materials, which can be bought at special places, like the one you see above. Anyhow, there are many types of materials, to mix concrete you need washed graded gravel between 5mm and 20mm, than you need also washed river sand. anyhow there are many types of materials, and you need to learn how to use them. So, let me write how we do that. 


Mix your own cement

Welcome to our article, Mix your own cement, article one. 

Dear readers, this original article is too long, so, I am making two blogs, ant this is the first blog. Anyhow, here we want to explain how to mix concrete, in several ways, we are also going to mix other things as well, and the name mix your own cement covers them all.

The reason why, we are writing this article how to mix your own cement, it is because we want to pass our knowledge of how these things are done. So, we are writing  this article for those people that are willing to do building work themselves, but they need a bit more knowledge to give them the courage to do it; and above all for those people that live in poor countries, where building skills and material are scarce, therefore, they need some knowledge to try building themselves, as long as they can buy Portland cement and/or lime to mix it with; so, this article can be D.I.Y article. 

This article “mix your own cement” (concrete) is going to be a long and detailed way of how to make concrete from scratch, using Portland cement and other basic materials, we will also describe how to mix mortar for the bricklayer and cement plaster, just by using the most basic building materials, by mixing them with Portland cement and/or lime. We will describe how these things were/are done, because we believe that it is helpful to know that.

We must say that today building anything has become easier, because most things that we need are ready made for us to use, provided we are living in a city or large town in the western world and in many other parts of the world. In our case we are talking about how to use cement and the things that we can do with it. So, let us suppose that today we need concrete; we can order it, and have it delivered whenever we want it.

But these things were not so in the past, in the past people that were building had to have their own skills how to mix their own concrete, how to mix their own mortar and other things, and sometimes they had even to find the building materials themselves, before they could start to build anything, they were not easy times and people in the know, kept their knowledge for themselves. But today it is different, the knowledge they had and kept to themselves has become insignificant compared to the things that we know and do; so, to keep any knowledge for yourself is the wrong thing to do, because it is not going to help you, but it can help other people if it becomes common knowledge, but this knowledge can be useful for those people that don’t know yet, because they happen to be in a different part of the world, so, they would like to know.

Therefore, this article is being written, in the hope that our articles can help those poor people that are not aware that they can build a better place for themselves, if they learn to recognize the basic materials, they need to use for building a place for themselves. Most of the building materials that we are talking about are available anywhere in the world, because they occur in the natural state as they are part of this great planet earth, so, what are those building materials you may ask?  And how we mix them you may want to know, so, here is a link from YouTube that shows you how to mix concrete.

How to Mix Concrete by Hand - YouTube

We would like also to point out with these photos here under what is available in Brisbane Australia, and then we will talk about those building materials that occur anywhere in the world.

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What are these building materials?  

Anyhow, I know a lot how to mix concrete, since I have mixed it by hand and with a mixer hundreds of times, so, let us see these building materials and how to use them. 

First, let us see what these materials are, then we will take you through how to mix them. (To view these matereals in Hub Pages, click on the link, Mix your own cement.) Today you can buy these building materials ready to mix, and all you need to do is to add the right amount of water and mix them, but here we want to start everything from scratch:

In building anything with cement, there are five main sort of materials that we need to recognize, before we start mixing our batches of whatever we want to mix, they are; bricklayers’ loam, plaster sand, river sand, gravel, and Portland cement; with these materials you can build anything, some of these materials sometimes are called with different names, but let us describe what these material are like:

Bricklayers’ loams is a very fine sand, some of these fine sands could be a tiny bit sticky and when it is wet enough you can almost make a small ball in your hand, but it will always collapse as there is not enough sticky material in it, but if you add the right quantity of cement and water (and perhaps something else if required) it is easy to lay bricks.

Plaster sand is very fine sand but not as much as bricklayer’s loams it does not stick together by itself, therefore, it will stick together only when you add cement and water to it, this type of sand is used to plaster the walls and can be used to lay concrete blocks it is ideal to use this sand provided it is very fine, in this part of the world we call this Besser sand.

River sand, or washed river sand is a type of sand coarser and thicker than plaster sand, as the name suggests it comes from the river, in this parts of the world because Brisbane river is salty water it is washed and sieved, but it is possible to find deposit of this sand in some rivers that can be used straight away,  sometimes this sand can be used by itself to lay a top layer on a fresh laid concrete, but its use is mainly used to mix it with gravels to make concrete.

Gravel or gravels are small stones again these small stones can be found in or near the rivers; in most places if there is proper supplier, gravels are graded so one can order them as they are required, and this is what we need to make good concrete. But if you happen to be in the middle of nowhere, they don’t need to be graded properly to use for concrete and one could use a mix of different size provided you know what you are doing. But one must be careful that this ungraded building material is free from silt and organic stuff.

Today of course building people rely more from the specialized suppliers, and they order through these suppliers what they need. You can even buy bags of ready mixed materials that you can use just by adding water. These materials are good to use, if you have a small job to do, but they become expensive to use if you have a large job. 

What we have described above are the main materials required to build most cement things, of course, you must know how to use them, and that is what we are going to write next.

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(PHOTO MISSING) To view photos click on the link, Mix your own cement).

Since there is not enough room to describe the cement properties under the photo above, let us describe it here; cement is like the glue that when mixed with sand, gravels and other aggregates makes these materials stick together. The word “cement” can be traced back to the Romans, who called this “opus caementicum” to describe masonry that resembles concrete. We dare say that the Romans used burned limestone which when you add water turns into hydrated lime and also they used something called pumice that was collected from some part on Vesuvius it was a sort of cement that when you added water would become harder than if you just used lime, this is more or less how I have been told. As you can see there are two main bonding materials that can be used to make concrete and mortar.

In this retailer supply shed above there are several ready to use cement product, so, beside bags Portland cement there are bags of hydrated lime, ready bags of concrete blend already mixed with cement, there is read to mix mortar and ready to mix plaster and other things. These ready mixed materials become costly when you must use a lot of it.

So, the cheapest and best way is to mix your own cement, or when the job is big then the best way is to order premixed concrete. If you need mortar or plaster, you must mix your own from scratch or pay the price of the bagged premixed materials.   

Mixing your own concrete from scratch.  

Because I am an old tradesman, I have been asked a few times the following from some friends. 

We want to mix some concrete ourselves; can you please explain us how to do that? We don’t have a mixer and we want to learn how to do that using the tools that we have; we have a couple of shovels and buckets a wooden float and some other small tools. We are a couple of strong blokes and we do not mind doing hard-physical work, it will be a pleasure to do some useful exercise, so, tell us how to mix concrete?

Okay, since you do not mind working hard, I will be glad to tell you how to mix your concrete by hand. Now, let us assume that you have the material on site, and that you are ready to mix your concrete. To mix concrete by hand, you need a flat platform where you can mix your concrete, this platform does not need to be made on purpose, all it is needed is a hard surface, perhaps a slab of existing concrete can be helpful or anything at all, as long as this surface is not loose, because you don’t want to mix the soil with your concrete.

To make is easy, we must assume that the bloke that sold you the building material, has sold and delivered some concrete blend. Now what is concrete blend, you are wondering; so, let us explain, concrete blend is gravel and river sand mixed together approximately two part of gravel and one part river sand, so, you don’t have to mix them anymore, it is ready to use.

To make normal concrete you need to mix by volume six containers of concrete blend to one container of Portland cement, depending on the quality of the concrete blend this may vary, so what we do next; we know that we need a lot of concrete, so, you measure say twelve bucket of concrete blend and put that on our platform, then you measure two buckets of cement to mix with the blend. These are the quantities to keep in mind, (6 to 1) this is a small batch of concrete, and you can make it bigger or smaller, if you keep that 6 to1 ratio. Sometimes this ratio may vary.

Now before you mix your cement with your blend; make sure that everything is ready, because once you start this process you must continue until you finish. Since everything is ready you can spread the cement on the concrete blend, after doing that you take your shovels fill them up and start turning your mixture around, by pushing the shovel under and turning it over, you need to turn your mixture a couple of time; say first from A to B and then from B to A, so, everything is in the same place, after doing that and you are satisfied that your mixture is mixed even, you can make a well in the middle of it, and add a bucket of water, if the water is absorbed quickly, then you know that you must add more water, if a fair bit of water remains in the centre then you can start folding the outside mixture in the middle, you can add some water as required, but don’t get carried away with adding too much water, because you need to add water bit by bit, you see this is one of those things that you learn as you do it and not before.

You have done all that and now you have a heap of this mixture half mixed; here again you take your shovel and turn your mixture from A to B while sprinkling some water on it, you may need to do this a few times sprinkling water and turning your concrete mixture from B to A and from A to B, you need to do this until you have an even mixture that it is well mixed. Now you have your concrete ready to place wherever you need to place it. 

This is how mixing concrete was done in the old days, it was a hard work and it was not as accurate as it is today with the ready mixed concrete truck that can deliver concrete to your job whenever you need it, and all you have to do is to lay your concrete slab, or whatever you need to do. Anyhow, the description above, can be used if you are in the middle of nowhere, and you need concrete.  

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Learn the art of mixing cement. 

Learn to recognize and use the building materials when we mix cement. 

Now, that we have written what are the building materials, and we have explained how to mix concrete by hand, this procedure can be applied to mix mortar and plaster etc. We have also explained how you can recognize the raw building materials.

You see, let us imagine that you need concrete, you live in the middle of nowhere and you have only a few tools, but you now a faraway place where you can go and buy Portland cement; you are not going to buy anything else at that place, because it is too far, it will be costly to bring it in, so, the rest of the concrete materials you are going to find near the river banks. I know it is like going back in time a hundred years ago, but there are parts of the world that are still that far back. Therefore, learning how to recognize the basic building materials for making concrete, and then mixing concrete by hand can still be useful today. So, we are writing these articles, hoping we can help any do it yourself small owner builders.

Now, we have to add that what we are writing here is how we have done these things, and we know they work, however, it is only our view, and they work well in all minor jobs, but if you have large important jobs, you must consult the local experts.

Now let us see how we mix concrete with a mixer. 

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Mixing concrete with a mixer. 

Okay, let us make this clear, there may be several ways how to mix you concrete; you can mix it on the ground, as we have described above, you can mix concrete in a wheelbarrow, if you have a wheelbarrow with a good tray, or you can mix it with a mixer which is helpful to have. But what are the different procedures when you mix, in order to achieve the best result with the least amount of time and work:

The greatest difference for mixing concrete and other cement materials is mainly this: when you mix by hand you can achieve the best result by mixing the materials with the cement before you add water, as this helps to make a more even mixture quicker: But when you use the mixer you don’t need to do that, in fact, you can have better and quicker result, by following this procedure hereunder:

Start the mixer and put in the mixer some water, approximately the proper amount to mix the whole batch, you know how much water to use once you have made a few batches.

Now before we proceed to mix, let us talk about the water amount. On building sites, it is near impossible to tell you how much water you need exactly, since the materials you are using contains an unknown quantity of water, therefore, the quantity of water varies, you see, the wetter the materials are, the less water you need and vice versa if they are dry.  

Now, let us assume that because you are new at doing this job, you are using a dry small bucket to measure the quantities of the building materials; in this case you have gravel and river sand in separate heaps, you know that this concrete is going to be mixed 6 to 1, but overall, this batch you are going to mix 8 small buckets of gravel four of river sand and two of Portland cement:

Now the quantities above are how the best and strongest cement can be achieved, with a minimum of Portland cement used; very likely these quantities are written in the specifications, if you have any specification written, and the ready mix people use those amounts and have a perfect concrete, because the concrete mixer will mix it well and as dry as possible. But by experience on building sites, we use a bit more river sand and a bit less gravel, as this makes it easier to work with overall.

Now let us go back to mix our concrete:  

So, after you have poured the water into the mixer, you put one single bucket of gravel and while the mixer turns put the two small bucket of cement into the mixer, the cement in the mixer will immediately mix in the water and the first bucket of gravel will make sure that it does not stick to the mixer, because it will cut though any lumps easily, now you add four buckets of river sand, and this again will mix very quickly and become like a thick cream, all you have to do next is to add the other seven bucket of gravel, once you have done that you only need to wait a little bit for the mixer to mix it properly and your concrete is ready. Now all you must do is to tip your concrete in a wheelbarrow and take it to the place you need to concrete.

This is the quickest and best way to mix concrete in a mixer, as I have done it for thousands of times, but I need to say that on building sites, where there is plenty of cement to mix and the workers have to try not to injury themselves, by lifting hundreds of bucket full of material all day long, they use to measure the materials by the shovelful, but you have to be an expert at doing that to get everything measured right. I hope this description of how to mix concrete is clear enough.

Before we leave these concrete discussions, we want to add more information; you see, concrete in itself is very strong in compression, but is lacks strength under tension, so, to make concrete very strong and last a very long time you need to use steel in the concrete; here is a link that will help to understand some of these issues.

 How to Make Concrete Even Stronger: 6 Steps (with Pictures)

 

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As we have said, we have split this article in two, so, we will continue to write how to mix mortar, plaster and cement topping in part two. See you soon. 

To see more click on this link, Mix your own cement

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Wednesday, February 15, 2023

Building retaining walls, part two.

WELCOME TO FRANK MENCHISE BLOG OF GENZANO DI LUCANIA, YOU ARE INVITED TO BROWSE AS LONG AS YOU LIKE. 
Hereunder let me paste of few links of my other blogs. 
This blog can be found in full at this link, DIY Retaining walls



Let us talk about retaining rock walls, now this picture has been taken from the internet, where I could not find what I wanted, however, this is how a hybrid rock wall can look like when built properly. And this is what we explain in this text. But in the text, the wall is a different shape. 

Welcome to part two, DIY Retaining walls 

Deciding to build your own rock wall.  

Anyhow, you needed more space, because you wanted to build a car port, and put a trampoline for the kids. So, you have been digging in the backyard, and finally you are satisfied that they can fit them in the space you have made. But now you have this bank that stands almost vertical in the backyard, it looks ugly, and you know that when the first heavy rain comes it is going to start washing it down, and worse still it may collapse. So, you think of building a retaining wall to hold the soil up. 

For this reason, you have had a couple of quotes and had a good talk to the contractors as you did not want to spend more money that was strictly necessary, they did their best but still you cannot afford to pay the full price, beside that you found that if you lay a dry stone wall, ether you have to use stones that have been cut at the quarry and they cost a lot, or you have to have a rock wall with a wider base and this is going to take away some of the space you created when you dug, so really you need to think about it.

So, you have decided to build the stone retaining wall yourself, what you have decided is that you are going to build an hybrid stone wall, which you believe can do the job without costing too much; therefore, you have looked for a rock supplier and ask for prices of the different materials you may need, because you think that you can afford it, if you do the job yourself.

By pure chance you have learned from the blokes that have given you the prices, how many cubic meters of rocks you need and other things that you were not sure before; well done sometimes in the building game things work out this way, you learn a bit from here a bit from there and then you can decide what to do with the information you have collected. There is nothing wrong for doing this, unless you do it purposely to learn something, but if it does not work out, then it is okay to use what you have learned from them.

I have to say that it has been done to me many times and that I have done this myself; not only on quoting but also in buying something new, if I have to buy something that I have never used before, I go to at least three places and inquiry about it, by asking the right questions not only I learn how much it is going to cost me, but I have learned how to use whatever I was going to buy in the first place, of course, I end up buying from one of them what I wanted to buy in the first place; sometimes I call this let me go first to spy and then to buy, I know that some of these people are going to feel a bit hurt, for using their time for nothing, but so what, sometimes you win and sometimes you lose, as I have said it has been done to me as well and I have felt a bit hurt, when I had to spend some time working out a price to build something, and at the end I did not get the job, so, I spent all that time for nothing, but that is life and we should accept the outcome whichever way it goes. Anyhow, now let us go back to building the rock wall.

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Building the hybrid rock wall.   

This hybrid wall that we are going to build is a big job, it starts at the same level, as we have dug the ground approximately level, but because we are building the wall only to the height of the natural ground level, it is going to start from almost nothing and at the highest point will be 1.8 meter, it is really two walls that meet and forms a square at the highest point.

Here we must say that today some people think that this should not be done, as this is neither a rock wall nor a concrete masonry wall, as it mixes about everything, but so what, if it is convenient, why not do it? I must say that in my life time I have built walls like this with whatever was available on the site; and I mean everything in fact I was using stones that were laying in this small creek bed and pieces of concrete that we had broken to do some alterations and old bricks, some concrete and some mortar, this has happened a few year ago and last time I have seen the owner he said that the wall is still there. So, most things can be done if you know that it has got a good chance to last a long time.

Let us go back to build our hybrid rock wall. Now, to build this wall you need a few cubic meter of rocks, because you want the wall to look as a rock wall, you don’t need very big rocks or special size rocks, because you can use the cement wherever necessary to fill the gaps and this is good, since the cement is less costly, you need a mixer, you need some gravel, sand and cement; and of course, you must have the tools to do the job.

You got all this on site, and you can start to build. First of all, drive a couple of pegs in the ground, exactly where you want the face of the wall to be, tie and stretch a line on these pegs and see any adjustment that you need to do before you start laying the first stone. What you are looking for here is that the bank you are going to build the wall against has been dug straight, it is almost vertical or a few degrees sloping, you have dug a shallow foundation, because you want the wall to be strong and last for a long time, so, you are satisfied that the foundation is going to be solid enough, since it is well below the original natural ground, therefore, it can hold a lot of weight and pressure, because the ground is very compact. 

You have done all this, you have set the pegs again so that your wall is set to be at least 10” thick overall, you have chosen this thickness because most of the large rocks seem to be that thick, so now you are ready to lay the first course of stones, mix a few batches of concrete and lay it in the foundation and then before this concrete sets lay the first course of stones on this concrete making sure that the bottom of the stones are below ground level, so that the entire stone wall seems to start from below the ground; once you have done that you can fill the back of the stone with concrete a bit above ground level but below the full height of the stones, because you want to leave enough room to lay next course of stone easily. Now the wall is all set to go, but we need to reset how we must continue and complete the hybrid rock wall, the right way with the right lean against the bank. You need to lean the wall against the bank, so that the weight of your wall by itself adds strength to the wall.

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Completing the hybrid rock wall. 

So, before we build this retaining wall, we must work out how much lean against the bank we want, here we must keep in mind, how tall and how thick is the wall, we don’t want the wall to lean too much and rely only on the dirt behind it to hold it back, but at the same time we want to lean it against the bank so that the weight of the wall is used to hold the dirt back.

Here we must go back to look at what happens if you lean a monolithic object to the point it is going to fall; what happens here is that the monolithic object is going to fall, only after its centre of gravity falls outside the area of the base. Now we don’t want to go this far, and we don’t want to use the centre of gravity to decide that, but we are going to lean the wall about two third of the thickness, so that the very top layer is still vertically one third of its thickness above the base; we believe that it is very safe to go this far and the wall would stand up even if we don’t backfill it. Anyhow, in our case we are not going to backfill it, because we have cut the bank exactly as the wall is going to be, you see we are going to use the bank as a template, so, we believe that we are not going to backfill it at all.

Now that we know how much we are going to lean the wall; we are setting a leaning profile on every corner leaning approximately 10 to 12 centimetres per metre and we are ready to resume building our hybrid rock wall. But there is still another important thing to work out; we need to make sure that when it rains the water that seeps behind the wall can run out, so, we must leave a way to drain this water out and at this level is the right place to do that, so, we choose a few spots about a meter apart and mark them, then when you lay next course of stones make sure that you leave a space between the stones that the water can run out, you must also leave the back free of abstractions for a course or two around this space, so, in this space after laying the front stone, just lay some smaller stones dry against the bank to stop the concrete blocking the drain, then you can resume to concrete the lot. Alternatively, you can lay a few short pieces of pipe across the wall for drainage, but you have still to make sure that they are clear of any obstruction at the back near the bank.  

So, now you can go back to mix some cement to lay your stones, you can mix a batch of river sand four to one that you can lay between the rocks to give them a bit of grip, you are laying the rocks in a straight line that you have tied on the profiles, when you do that make sure that this cement does not come too far forward, because you still want the rock wall to look like a rock wall, at the same time do not forget that you have to leave these spaces with no cement at all for the seepage where you have marked, after you have used the batch of river sand and cement and laid say a course of rocks, you can mix one or two batch of concrete to fill the back of the stones, then you repeat this procedure until you build the entire wall.

At the top of the wall, because the wall in not going to be level, you may have to do some adjustment to follow the height of the ground, here you have to use common sense the best way you can, if you happen to have enough wide and long rocks that can be used for a coping, use them to finish your wall, if not, just use your common sense and use anything that is available, even if it is going to be a strip of concrete in the back of the wall, so that all the wall is tied up.

I hope I have explained well enough for you to follow my way of building this hybrid rock wall. Here I want to add that this is just one way out of several other ways that can be used. A lot depends how the bank has been cut and if it follows very closely the shape of the wall, so, you can use it as if it is formwork, but if there is going to be some back filling to be done, you may have to consider some temporary formwork that can be easily removed before you backfill. All these things can vary from job to job, and if you see that it is hard to build your hybrid rock wall, then you must consider other ways to build your retaining wall.    

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Why we need these retaining walls?  

We need retaining walls, when the block of land is steep. So, it requires a lot of work to be done, if you want a small portion of your land flat, so that you can stand and enjoy whatever is there to enjoy and do whatever you want to do in the open air.  See the photo here under, they have built a Besser block retaining wall with an indent in it, mainly to give extra strength to the block wall and to put this concrete slab and use this indent with whatever they want to do next. Note that above this block wall there is another sleeper retaining wall, these sorts of things are very costly, and we must plan it out before we start, anyhow, under below we are going to write about a Besser block retaining wall, first just a normal strong retaining wall and after that we are going to build a leaning Besser block wall, similar to the hybrid rock wall. 


Most retaining walls are made of concrete blocks, Besser block retaining walls are usually made with hollow concrete blocks, they are 190 x 190 x 390 mm. They are laid with mortar 10 mm thick joint, steel reinforcement bars are placed in the hollow part of the block, then they are filled with concrete once the walls are dry enough.    

Building a Besser block retaining wall

Besser blocks retaining walls require a reinforced concrete foundation with steel starter bars placed exactly in the centre of the hollow part of the block, when you look at the wall from the front or back, and if possible, a bit close to the side where the pressure of the soil is going to be, but that can be asking too much from the concrete man and the steel fixers. So, a profile must be in place before you can even concrete the foundations, or fix the steel in the foundation, because all measurements need be known and easily measured while working on it.

This is a very demanding job and it is not a do it yourself job. So, the name that I have given this article DIY retaining wall would not apply in this case, you see I apologise because I was forced to use DIY just to overcome the problem of the title that happens when we start a new article and find that the name we have chosen has already been taken.

Anyhow, when you start laying the first Besser block in most cases, it is helpful if you can start the first course with an open block, this block looks like a square C, and you lay it with the open side facing away from the bank that it is going to hold back when everything is done, the corners are built with normal blocks and most of the walls are built with blocks that look like an H, so, it is easier to fill up with concrete, once the wall has been built. Now while the block layer is laying the blocks, he will have to lay horizontal steel bars between the courses of blocks as specified, if there is a plan and specifications, or use common sense, or copy from the specifications of a similar job he has done, the vertical steel bar will be inserted from the top before or while pouring concrete into the blocks.

Now the reason why we need to use an open C shaped block for the first course, it is because it is necessary that before we fill up the blocks we remove the mortar that has fallen down at the bottom of the blocks while we were laying them, you see, we want a solid base and we want the concrete to bind around the starter steel bars that we have laid in the foundation and this is the best way to make the retaining wall as strong as we can. Once that is done, we can fix a plank against the openings, and we are ready to pour the concrete in the wall. 

Here we must say that for this retaining wall we have not mentioned any drainage yet, so, what happen to the water that seeps behind the wall needs to be worked out, you see, sometimes when we build walls this strong, there could be a reason that we do not want any water past the wall, it can be part of a base of a house being built, so, we have not even left any weep holes in the wall, because there is going to be a drainage pipe laid behind the wall surrounded by gravel. The wall might also be treated with special paints to waterproof it.

This is one type of blocks retaining wall, and I am going to write about another type, where we lean the retaining walls towards the bank for future back fill that it is going to hold up, this is a large job that we did years ago in a yard of a new large home in Redhill a Brisbane suburb. We are going to write it here, to show you another type of retaining wall and the many ways that can be built.

 

Redhill backyard problem solved. 

Years ago, we worked on this part brick house in Redhill, we say part brick house because the top floor of the house and the interior was made of timber, so, it was a brick veneer, the base was solid bricks and blocks, it was a large house, on a large block of land had two street frontages. It was on a hill and the difference between the front and the back yard was a lot, but the two street frontages was good, because the house was being built on the higher part of the block of land, where it was nearly flat there and almost level with the road, so, there were no problem building the house; but the back yard was very steep, in some places could have been up to 45 degrees.

So, when we finished the brickwork on the house we were asked from the owner, if we could build some retaining walls, because the backyard was useless as it was. So, after discussing the financial part how he would pay us; we discussed how we could fix the back-yard building block retaining walls. So, it was agreed that we had to lay these block retaining walls leaning a few degrees towards the bank. We had to build concrete stairs on one side, so that the house could also be entered from the back street, so, working together with the owner we did the following.

Because you cannot build a very high wall on the road boundary, first a section of about 4 feet wide (1.2 m) was dug and a foundation was poured, with starter steel bars as needed and the main wall was set about a meter from the road where the first retaining wall was to be build, this was the main foundation for a start, some of the small foundations and other adjustment we had to work out as the work progressed.

The decision was that we had to build the wall leaning towards the bank for extra strength; you see, when building retaining walls the weight of the retaining wall with the weight of the foundation must be more than the weight that the backfill can move, if possible that you can build a very strong monolithic wall and foundation together this is the best solution, in this case it was not possible, because the job was too big, beside that you need to have a very wide and heavy foundation and a very strong bond between the foundation and the wall, since this bond between the foundation and the wall is the weakest point unless it is concrete and poured together, but we were using blocks to build the wall, therefore, it had this weakness at the bottom of the wall, therefore, by leaning the wall towards the bank, the weight of the wall becomes  the first point or resistance.

Now, how much we must lean the wall was left to us block layers, because for sure there will be problems, and there were several problems to overcome; the first problem is that if you have to return the corners it cannot be done, but we had corners on the boundaries of the joining block of land, so, we had to think how to overcome this drawback, for this it was decided that we would not build the corners as usual, we should treat them as separate, but we would place a corner steel rod every course, instead of every second course, as in the wall itself.

There was also the possibly that while we were building the wall, if we lean it too much it could fall on the inside, while we were building it, so, we had to strike a balance. Knowing that this first wall was going to be no more than 3 meters high, we worked out that if we lean the wall 5 centimetre per meter, the top of the wall was going to be about 15 centimetre back from the perpendicular, the blocks were 19 centimetre wide and it would be okay, as once the wall was built it could stay up on its own without falling inside, but while we were building we should be very careful not to apply any extra weight on the leaning wall, just for fear that this could happen we added a couple of block piers behind the wall, this would not only make the wall safe for us while we were building it, but it also would make the whole wall stronger. 

Anyhow, we built this block wall placed the reinforcing rods in place, we also built some concrete steps on one side of it, so, that if you happened to be on the back road you could walk to the house, the ready-mix truck came, and the wall was filled with concrete and that was the first stage finished. We had to wait for this wall to become strong before we could backfill it, and then we could build another retaining wall halfway the backyard to finish the job.

Dear readers, be warned that this type of work can only done from very experienced block layers, as it breaks all the rules in the building trade, but we did it and it worked. 

Anyhow, this article is becoming too long, so, see you in our next article, Mix your own cement

To see more click on this link,  DIY Retaining walls

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