Heat of Hydration
Heat of Hydration
(OP)
I'm looking for some material information.
Does anyone know at what temperature, the heat of hydration is detrimental to concrete. I'm not thinking differential temperatures, but just how hot the concrete can get. In addition, is there a strength at which heat of hydration is not a problem, anymore?
The reason being is that concrete gains strength when it is warm (or maybe a little hot) and if the forms can be insulated to capture the heat of hydration, it may promote early strength. Just curious.
Does anyone know at what temperature, the heat of hydration is detrimental to concrete. I'm not thinking differential temperatures, but just how hot the concrete can get. In addition, is there a strength at which heat of hydration is not a problem, anymore?
The reason being is that concrete gains strength when it is warm (or maybe a little hot) and if the forms can be insulated to capture the heat of hydration, it may promote early strength. Just curious.

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So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates
-Dik
RE: Heat of Hydration
This risk is modified by the concrete composition. Replacing cement with GGBS or fly ash, particularly higher percentages, reduces the risk at a specific temperature.
RE: Heat of Hydration
-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates
-Dik
RE: Heat of Hydration
https://link.springer.com/article/10.1007/s12205-0... is the sort of thing I am thinking of.
RE: Heat of Hydration
RE: Heat of Hydration
Cementitious materials is part of the solution... in the last two decades, I've gone from 20% max to 40% max...
drift... I'll see if I can dig up the reference.
-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates
-Dik
RE: Heat of Hydration
RE: Heat of Hydration
-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates
-Dik
RE: Heat of Hydration
"The maximum temperature of the concrete during and after the application of heat must not exceed 70°C for all concrete exposure classifications"
Queensland TMR:
"The maximum temperature within the enclosure (steam curing), or the maximum water temperature (hot water curing) shall not exceed 70°C. The maximum temperature at any point within the concrete shall not exceed 80°C at any point during or after the heating or curing process. The internal concrete temperatures shall be measured at the largest cross section for a period of 48 hours after concrete placement or until temperatures have dropped to 5°C below the peak temperature whichever occurs first."
RE: Heat of Hydration
-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates
-Dik
RE: Heat of Hydration
RE: Heat of Hydration
-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates
-Dik
RE: Heat of Hydration
RE: Heat of Hydration
-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates
-Dik
RE: Heat of Hydration
Me too! Neville was actually "local" for me in that he spent a portion of his academic career at the university of Calgary as the engineering department's founding dean (he passed in 2016). He was emeritus during my time buy I lucked out and got to meet him at Mrs. KootK's graduation ceremony (also structural). I was the taker of the photo below. Would you believe that Mrs. KootK didn't even know who he was or why I was making a big deal of it? Yeesh. I should have made her take a photo of Neville and me instead.