If I mix carbon particles ( size 30-80 micron) in cement , what will be the effect on internal concrete temperature during first 24 hours of hydration ?
I don't think it will show any reactivity within the cement matrix to affect internal temperature but it will definitely increase your water requirement to maintain your slump as carbon particles absorb lot of water. If you increase the water content to maintain your slump it will have a negative impact on your strength. If your main target is to reduce internal temperature you can add any pozzolanic material as a cement replacement material. The highest heat is released from the hydration of C3A phase, followed by C4AF and C3S and finally the lowest heat is released by the hydration of C2S phase. If you reduce the cement content and replace it with some pozzolanic material, it would be highly effective in reducing the heat of hydration in first 24 hours.
Thanks Rajeev for your reply. I have in fact measured the temperature difference with and without carbon particles in cement paste over the past two days. The results support your hypothesis. Actually I expected the temperature to rise slightly due to addition of fine particles hoping that they would accelerate cement hydration. There is a temperature difference but its too small to conclude anything.
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