type IV cement

low-heat cement, type IV cement

A cement in which there is only limited generation of heat during setting, achieved by modifying the chemical composition of normal portland cement.
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f = 2.25 - 2.73 [C.sub.3]S = 36.4 - 78.9% * R = 2.14 - 3.40 [C.sub.2]S = 4.3 - 42.7% a= 0.638-2.80 [C.sub.3]A= 0.0-15.6% t = 91.7 - 99.4 (t-bar = 95.5%) [C.sub.4]AF = 5.1 - 20.2% * Note that the range of the alumina modulus (a) has been limited to a > 0.638, and the cements covered do not include Type IV Cement.
If one wanted to lower the C3S to 34% to avoid the heat of hydration performance test on Type IV cement, what change in f would be required?
Additional changes in the composition likely would need to be made to meet the ASTM Standard Specification for Type IV Cement.