Technical Questions

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Definition of “hot cement”

Q. What is meant by “hot cement”?


A. ACI CT defines hot cement as newly manufactured cement that has not had an opportunity to cool after grinding of the clinker. Between the time cement is ground and its delivery to where it will be used in concrete, there is little opportunity for it to lose heat, particularly when construction activities are at their highest rate and facilities are being strained to meet deliveries. Hot concrete in hot weather is subject to high loss of moisture by evaporation and rapid hardening, which affect the placement operations and the cracking potential. Because the cement fresh from grinding mills is hotter than the other materials, it is frequently considered the sole cause of the trouble. This gave rise to the term “hot cement.”


References: SP-1(02)ACI CT-23

Topics in Concrete: Cementitious Material;  Concrete Fundamentals

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