Pouring concrete with overnight frost?

[flanagaj]

This week is looking nice and dry with daytime temperatures in the region of 14c-18c, but with low temperatures overnight.  If the concrete is poured in the morning and I cover the trenches with a concrete frost protection blanket, will that suffice and ensure that the concrete doesn't suffer irreparable damage. 

[markc]

In trenches you won’t have any problems (unless you are pouring into permafrost) as the ground will be several degrees above freezing.

[SteamyTea]

From my limited understanding of the chemistry involved, once the water is added, the reactions start.

So if warm(ish) when poured in the morning, a frost should not bother it.

 

[Russell griffiths]

For footings, pour it in get it level go to pub, that is it. 
do not cover, waste of money. 
slab, that’s a different matter, finished floor that’s a very different matter. 
 

[Oz07]

Yeh trenches be fine. I'd like to think now we are past the stage of hard ground frosts. I'd like to think we're past the window scraper stage tbh

[saveasteading]

Agreed.

But as I say to everyone.  Do not add any water to the supplied mix. That spoils the concrete but also remains as liquid water and might freeze.

If using a builder tell them this strictly and also the concrete driver. No added water. 

If requested the driver insists on a signature to absolve his company.

 

Your concrete will be safe after about 4 hours.

 

@flanagaj you haven't set out the building, let alone dug the trenches. Ambition is great but assume there will be challenges. You may hit obstructions.

How are you going to control the concrete level?

[flanagaj]

6 hours ago, saveasteading said:

Agreed.

But as I say to everyone.  Do not add any water to the supplied mix. That spoils the concrete but also remains as liquid water and might freeze.

If using a builder tell them this strictly and also the concrete driver. No added water. 

If requested the driver insists on a signature to absolve his company.

 

Your concrete will be safe after about 4 hours.

 

@flanagaj you haven't set out the building, let alone dug the trenches. Ambition is great but assume there will be challenges. You may hit obstructions.

How are you going to control the concrete level?

I'm going to bang some vertical rebar into the centre line of the trenches and level the tops with my laser level.  I'll spray the tops red to aid visibility.

 

I'm also hiring an inline pump so it can be poured quickly.