Each owner is interested in that the prepared cement mortar is of the highest quality possible. In fact, improving the quality of cement is not as difficult as it might seem at first glance. There is one simple and affordable way, which is very often resorted to even in the construction of large facilities. As it was not difficult to guess, we are, of course, talking about additives.
Today the market has a huge number of all kinds of additives and additives in cement slurry, which in one way or another should change its quality. There is also a very wide range of ready-made mixtures. The disadvantage of all of the above is the price, which is often unreasonably high. At the same time, there is one "folk" additive that builders have been using since the days of the Soviet Union.
So, in order for the cement slurry to receive additional elasticity, tenacity and strength, one additional ingredient must be added to it. It is the good old PVA glue. Of course, depending on the type of work to be done, a strictly defined amount of glue must be added to the cement. This is because different volumes of PVA can significantly change the characteristics of the building composition. What are the proportions of the supplement?
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If you need to cook a good plaster, then for this, first, 1 part of cement is mixed with 5 parts of sand, and then 60 ml of glue is added for every 10 kg of the resulting mixture.
If needed restore crumbling walls, then first we prepare a solution from 1 part of cement and 3 parts of sand, and then add 0.5 parts of PVA glue to them.
If needed concrete the floor, that first a blank is made for a mixture of 1 part of cement, 2 parts of sand, 3 parts of crushed stone, then 10 kg of PVA is added to the dry composition and only after that a solution is made.
If you need to create elastic concrete, then we simply add PVA glue to it in the amount of 5% of the total volume.
If needed lay tiles, then first we make a solution from 1 part of cement and 5 parts of sand, and then pour PVA glue into it in a volume of at least 20% of the volume of the prepared solution.
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A source: https://novate.ru/blogs/250620/55053/