If i pour cement onto the top of set concrete will the two layers stick together?
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If you pour cement on set concrete it will not stick for longer time. Pouring cement on set concrete surface does not add any strength however sometime used to finish the newly constructed surface(Cement wash). Cement is cementing agent used in construction to give bondage between sand and metals. It takes some time to get strength and release heat during chemical reaction and minor creaks developed in heat dissipation. If cement is poured on set concrete without mixing any sand (Mixture of Cement sand and water which is used as plaster) will leave the old surface after sometime. If you want to pour cement for smooth finish put 6-10 mm layer of mixture of sand cement and water after making old surface rough by scrapping with hard /iron wire brush. At the same time if you want to stop seepage / leakage in old concrete add water proofing agents in mixure(Plaser). If you want to add structural strength, take help of good Civil Engineer.
don't think so?
no, they would have to be both unset
No, cement needs to adhere to something. Not knowing the surface you are trying to cover, it is difficult to answer. If it is a wall you will need to put rebar in the set concrete to pour the new.
You need to rough up the existing surface before you can pour the new concrete and put down a cement epoxy
no, but you can get compounds from your local hardware store to help.also drilling holes in existing slab and inserting mesh or rebar depending on size will help
Probably yes.
But it pays to use a bonding material like pva solution between to be sure.
you have to pick it then coat with bondcrete first
Yes, you can pour new concrete against existing, set concrete and get a degree of bonding -- but not nearly as strong as a continous pour. Check at your hardware store and you'll find an adhesive you apply to the existing concrete improve the bond. This is often good enough for something like filling a cut trench, crack/break repair, etc.
But if you're doing a sizable pour that requries structural integrity with the existing slab, drill some holes in the old slab and insert rebar to tie the two slabs together.
If the only possible movement is lateral, I'd just bore a snug hole and pound the rebar in. If there's a load that could pull the slabs apart, I'd actually epoxy the rebar into the existing slab.
Finally, if you're just pouring a self-leveling thinset over a slab to fill in lowspots before installing flooring, no mechanical reinforcement is needed.
It really depends upon what your goal is. Are you repairing cracks? Reinforcing posts? Making cosmetic repairs to walls?.May I suggest a website?
concretedecor.net
I asked this question myself and got some good answers. If you will go to the place where it says Ask? Answer: Discover and underneath that is "Search for questions"and type in concrete on top of cement you will find an answer from a civil engineer who says it can be done but you have to use a certain bonding material and he gives the web site and names.
Buy a container of PVA adhesive dilute according to instructions, spread on and lay on your extra layer. ( Poly-vinyl-acetate ) water soluble.. Can buy in builders merchant.. Widely used in the building industry.
No
the bond between the two would be weak
You really need to first drill holes in the existing slab and hammer cut to length pieces of rebar. Quite a few too.
That will tie the two layers together.
Believe or not, you could glue it. But you are better off putting in the iron supports.
yes unless you put something in between them to keep them from sticking together.
Never !.You will get some adhesion not nothing of any strength.You don't say what two surfaces they are so its a very hard question.last word , if its cosmetic then ok.but any sort of traffic, ie, auto`s then forget it.
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