Guidelines for Trials and Execution of Temperature Controlled Mass Concrete

Pawan Dhagate

Staff member
It takes very step by step precautionary measures and action plan to produce and execute pouring of temperature controlled mass concreting works , hereby we are sharing our experiences for guiding those who are all facing it for new .

Please share response in order to guide and share further in details on this subject .

regards

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K Kiran

Senior Member
Request you to respond following query
1) how much temperature is required during placement of concrete ?
2) what is the temperature difference surface to the core ?
3) Size of ice flakes used in concrete mixing
4) any bleed spots are observed as ice flakes are prone to bleeding.
5) rise in temperature in core after 72 hours
6) why we use temperature controlled in raft ? (except the reason HOH)
7) what kind of mixer is used to produce this concrete?
 

Pawan Dhagate

Staff member
The Mass Temperature Controlled Concrete has its very specifically defined Specifications given by Designers and Consultants (Codes) .Still in response for your queries can be answered as follows :

1) how much temperature is required during placement of concrete ?
Ans: The controlled temperature shall be kept ranging 21-24*C keep all others factors and constraints .

2) what is the temperature difference surface to the core ?
Ans: The differential variance shall not be greater than +/- 20 *C . (Shall be monitered upto 4 days )

3) Size of ice flakes used in concrete mixing
Ans : It depends upon the setup of production unit ,if there is chiller plant than qty of water shall be replaced by 20% of ice keeping productivity in mind .

4) any bleed spots are observed as ice flakes are prone to bleeding.
Ans: No, The uniform mixing shall be observed and then batch to be discharged . Unmelted ice may lead to vary in temp .

5) rise in temperature in core after 72 hours
Ans : The common observation has concluded as maximum rise in temp is at 62-64 hrs then it comes droping .
6) why we use temperature controlled in raft ? (except the reason HOH)
Ans: Please go through IS Codes for temp controlled and Hot weathered Concrete ,This will give you more answers in this context .
7) what kind of mixer is used to produce this concrete?
Ans : Batching plant can be used of capacity from 0.5 to higher side .

I hope this will atleast resolve your queries for now , Lets keep it interactive to discuss this wide subject in details .
 
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K Kiran

Senior Member
Above queries were asked in the context of knowledge sharing .pls don't mind. And further out of experience I have two points as an process improvement.
Pls reduce the thickness of ice flakes upto 3mm and try to use twin shaft mixers which will reduce the localized bleeding channels.
 
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