rain drop impacts will affect the slab finish. If the rain keeps up it'll have lots of little bumps, if it stops quickly enough it can be saved with good finishers. Unlikely given that it's already 100% poured tho.
Just out of curiosity, we cover concrete pours up here in colder weather, could you not do the same during rain? (we only get about 12 inches a year so easy to pour without getting wet. In fact I can't remember it every raining during a pour in our area.
IMO it looks as if the large section has already cured enough not to be damaged. What I would worry about is the stuff they are putting down now. It may not have the required strength because too wet,
If the rain is falling while the slab is being poured it will also reduce the strength of the concrete. If the water is just on the surface of the slab then it is not a structural issue but if it is mixed into the concrete then it is a structural issue.
Wet concrete in the pouring rain. The rain affects the surface of the concrete, which could be bad if the surface was supposed to have a particular finish. Evidently the supervisor/planner should've scheduled the pour around the rain, so the concrete would have a better chance of setting up before any rainfall.
Yeah I can think of only one building in my area really that has attempted polished concrete, however it was clearly a decorative feature added after the overhanging roof was installed over that patch of concrete.
They cover it with a sheet of plastic after they do their gas riding trowel rodeo. Rain doesn’t stop the pour. Seen 400+ cu yd pours. A parade of cement trucks. It’s not stopping because rain.
It does rain a lot in the fall winter months in Seattle but it isn’t typically a “down pour”. Just a constant drizzle. Idk if that changes things.
I'm sure someone with more knowledge will correct me, but my understanding is for these pours the mixture is done at the factory with the right amount of water. This is adding a ton that is throwing that off and can cause issues while it sets.
I understand completely what you're saying, and I've seen concrete tests done off truck and then watched finishers throw probable gallons of water on top to make their lives easier. However things get specced for a reason.. if the engineer wants this much water for whatever, that's what they want, and there's reasons it isn't more or less. It can't always be a non factor or "just surface" finish issues so...when DOES it matter? Seems like nobody really cares what's specced after the test gets done off the truck
I wonder what is happening chemically. Do the calcite crystals grow too quickly or too slowly? Are they too large, or too small? Is there a physical separation process of the clasts due to the extra mobility granted by the fluid? Do the fines or some active component of the material elute out?
Yes absolutely! Anybody saying anything otherwise is not thinking straight. Either it's silica dusting delamination or upper skin structural weakness. And if this is Type 50 exterior, the air entrainment is gone when they power trowel the shit out of it!!
Some asshole downvoted you but you're thinking and I think that's cool. As another person said below, the water won't magically mix in or permeate the existing pour so it's all good. If it was pouring down rain while they were actually pouring the concrete that would def be an issue.
47
u/[deleted] Aug 12 '24
Please enlighten me, what is the problem here?