It hasn't stopped raining since I poured concrete!! Question:

Is the water running off or being absorbed? If you didn't pour it to wet and it had time to set up before it started raining it should be okay.

Whoops! changed poor to pour, I was tired.

 

Concrete will set up even under water. It is a chemical reaction. I have built structures for Coast Guard navigational aids out in the South Pacific where we used bags of redimix for the foundations and the structures were still there many years later when the old battery powered lights were converted to solar powered lights.

 

Just put a plastic cover on it and put cinder blocks to hold it down and it will set up eventually!

 

Quote:Yep. Sailor gets the prize It sets up under water.

 

In all my years in construction I've not seen concrete "go bad" from rain. I've seen it pit like crazy from the rain drops hitting the surface, and I've seen it not set proper in a timely fashion. But once concrete is poured the water that was used to mix starts to dissipat If you had any set time at all you're fine. I would say 2 hours on a 4 inch slab. Acually if the concrete dries to fast that will cause more problems than rain.

 

When we had the slab poured for our garage we ran sprinklers on it for a few days so that it didn't get too dry.