Fresh concrete feeezing?

So contractors are just finishing of laying 60m3 today of outside yard space.

It’s due to be -6 tonight, suspect in reality it will be -3 or 4 but even so.

They didn’t plan on covering it over but I suspect they now may.

If I hadnt have called in and they left it exposed, what’s the worse that could have happened and by when?


I believe the water in the top few inches can crystallise and cause it to lift in the worse case. As said it does create a lot of its own heat as it is a chemical reaction so a sheet will do a world of good.


Plastic will keep it wet, and straw over the plastic will keep it warm, and keep the plastic in place. Don't worry if there's a little frost on the bottom of the plastic where it's lifted up from the concrete. It would have ruined the surface if it froze, not sure that it would freeze, depends on how long it stays cold.
Thanks all.

This is all part of fixed price contract, they have been pouring on and off since October, about 1.5 acres going down. They have done an average job so far but I got cross tonight.

Turns out there was quilt on site they just didn’t know / care.

Apparently any frost related damage is visible within 5 days?

I don’t confess to know a lot, I’ve laid a bit in my time but my rule of thumb is do it right first time, these guys seem to be pushing their luck.
It’s an absolute No no. Do not lay Concrete ahead of a frost.

I’m amazed that the plant it came from would even supply it if they knew where it being laid ahead of tonight’s frost.
They certainly won’t guarantee it.

Thank you, this was what I thought. Independent surveys are checking the work and will be told about this. The stuff is too expensive to get wrong.

Old apprentice

Arable Farmer
Straw spreader blower cover it if you could .concreted some yearsenal ago the sandyear pert of concreat liftEd and washed of the stone left raised of corse rough to scrapensure but leveled over years. The 200 loads or so of concreat I have layed all exsept 2 were based on limestonew with silage and slurry it all dissolves and wears together and leaves r reasonable surface. Best of look to night have you any nabours with straw spreaders could help?

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