Concrete Curing Comment

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Concrete Curing Comment

Postby dozer » Sun Mar 14, 2010 12:30 pm

Co
ncerning cement....the very best is no better than the cheapest available if it is not allowed to cure. My experiences here are that very few if any at all are aware about proper curing of concrete. They will strip the forms off as soon as it sets, don't wet it down, much less wrap it and let it dry out. The curing of concrete is an exothermic reaction and has to be able to hydrate in order for it to gain maximum strength. This is why you see so many cracks in concrete work here. It is weak, brittle and very prone to cracking due to this lack of proper curing. It is best to leave the forms on for a couple of days if possible, as the forms when left in place help in keeping the freshly poured concrete from drying out too fast. Unfortunatly, the contractor is wanting to get on with the rest of the pouring of beams and piers and such, and needs to put back in use, the forms. Having said that, the next best thing is to wrap all exposed, fresh concrete in plastic sheeting as this will keep it from drying out. As it cures, it produces a lot of heat, which condensates and moisture is released and collected inside the plastic, letting it self-baste as it were. Plastic is cheap and is really worth the effort to obtain strong concrete structures. Concrete cures for decades after the fact if it gets a good start.


Curing of concrete comment received. This has been covered in various threads, but is an excellent point. The problem normally comes in that contractors will not take this into consideration when bidding a project (that they need to let the concrete cure for several days) and therefore it introduces a problem during a project..... I find it is best discussed up front to let the concrete cure within the form work itself for 5 days to a week and therefore eliminates the need for plastic wrap and tears in plastic and other problems.
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Re: Concrete Curing Comment

Postby developer3d » Sun Mar 14, 2010 2:15 pm

If formwork removal and plastic are too hard for your builder there is a company in Phuket that sells wax based curing compounds for prevention of premature water loss in concrete and shrinkage cracking basically you paint it on that might be worth looking into.

http://thaibondall.com/product_oil.php
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Re: Concrete Curing Comment

Postby cruzing » Sun Mar 14, 2010 3:44 pm

developer3d wrote:If formwork removal and plastic are too hard for your builder there is a company in Phuket that sells wax based curing compounds for prevention of premature water loss in concrete and shrinkage cracking basically you paint it on that might be worth looking into.

http://thaibondall.com/product_oil.php



But try getting a reply from them......it's impossible. I've tried several times.

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Re: Concrete Curing Comment

Postby Mike Judd » Fri Sep 16, 2011 2:21 pm

A house is only as good as it's foundations, so don't scrimp on the steel, and remember the more cement the stronger and the more water the weaker with concrete, the correct ratio is the thing, with plenty of curing time afterwards is critical. Thai's love plenty of water in the concrete so it flows out level with-out any effort on their part. Very Bad Practice. Also any slab should have expansion joints max 6mt apart. Columns should be well vibrated or hammered to get air and voids out, patching with cement afterwards is the way they fix it, but no where as strong.
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