Cold weather concrete strength
Cold weather concrete strength
(OP)
Years ago I saw a study that showed the correlation between air temperature and the time it takes fresh concrete to reach various compression strengths. Does anybody know where I can find something similar?





RE: Cold weather concrete strength
RE: Cold weather concrete strength
Depending on the conditions, the 28 day strength of the actual in place concrete can be above or below the 28 day lab strengths. - Possibly below, but it can also be higher depending on the raw materials, cement type and conditions.
RE: Cold weather concrete strength
RE: Cold weather concrete strength
If you are concerned about durability, that is a much more complex problem and most likely will already have been established by the conditions the concrete was exposed to before you have any opportunity to do any thing about it. Concrete can be allowed to continue curing, but loss of durability cannot be restored if it is lost.
RE: Cold weather concrete strength
RE: Cold weather concrete strength
The mix design they provided had 564# cement, 262# water, and they added accelerator due to cold weather. Slump of 4 was specified
My first thought was that the concrete took too long to get to the site, or they added too much accelerator, but I find it hard to believe that if they sampled the slump on site and got 4", that it would have set up in 30 min. any thoughts?? I dont think that the w/c ratio is an issue, since higher strength concrete is typically limited to this ratio, and also that ACI recommends lower wc ratios for cold weather.
RE: Cold weather concrete strength
RE: Cold weather concrete strength
Yes, we already had a discussion about setting the dowels and anchor rods prior to the concrete.
Regarding the accelerator, is this typically added at the plant, or on site? Personally I think they added too much, and did not account for the travel time. Can they add it on site?
RE: Cold weather concrete strength
RE: Cold weather concrete strength