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Concrete pours in rainy weather - what precautions should be taken?
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01-06-2016, 06:35 AM #1
Status: Offline Posts:11 Threads:11 Joined:Oct 2015
 Concrete pours in rainy weather - what precautions should be taken to protect the integrity of the concrete?

The strength and durability of set concrete are not adversely affected by the presence of rainwater; however, if the concrete is not set, some of the cement from the concrete surface may wash away.  This occurrence weakens the concrete surface leaving it prone to scaling, dusting, discoloration and cracking.   In rainy regions, such as the humid deep south and temperate Hawaii, this is a constant problem.

How can the integrity of newly poured concrete be protected if exposed to rain?


Scaling
[Image: spalding.jpg]

Dusting
[Image: dusting-on-concrete.jpg]

01-06-2016, 10:15 AM #2
eaadams Concrete Moisture Expert *****
Status: Offline Posts:600 Threads:88 Joined:Jul 2010
Usually protection is beyond the scope of flooring contractors.  But we deal with this a lot.  A poor cap on the concrete.  I've had whole gyms fail because of it.  Usually the GC will get sold some sort of spray on product or some goop you mop on.  But that doesn't work.  The only good answer is to shotblast or scarify the surface to remove all the weak create.  Usually these slabs have a high RH and that is a good time to put down an Epoxy moisture system.  Then you prime it and put a good smoothing top coat over the concrete.








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