Cements with reduced hydration heat evolution

Clinkers with increased C2S and reduced C3S contents are employed in the production of cements with reduced hydration heat evolution (see section 19), such as moderate heat of hardening cement (corresponding to ASTM Type II cement) and low-heat cement (corresponding to ASTM Type IV cement). To slow down the rate of heat evolution, cements employed for this purpose are usually ground to a relatively low specific surface area. Cements of this type are used in applications in which a reduced release of hydration heat is required, as in the constraction of dams and other bulk concrete structures (Kelham and Moir, 1992 Sone et al, 1992). High-C2S cUnkers, especially those with a reduced C3A content, are also constituents of some oil well cements (see section 27). L0W-C3S clinkers are less suitable for the production of blended cements, owing to the reduced amount of free calcium hydroxide produced in the hydration of such clinkers. 

Cements with reduced hydration heat evolution 277... 

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