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These equations were put forward by Bogue to calculate the potential composition of cement (based on content of different oxides). These are:-
C3S = 4.07 CaO - 7.60 SiO2 - 6.72 Al2O3 - 1.43 Fe2O3 - 2.85 SO3
C2S = 2.87 SiO2 -0.754 (3 CaO.SiO2)
C3A = 2.65 Al2O3 - 1.69 Fe2O3
C4AF = 3.04 Fe2O3
(above equations only valid when A/F ≥ 0.64 )
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