The Oxide composition of O.P.C. is as follows :
CaO (50%), SiO2 (15%), Al2O3 (5%), Fe2O3 (3%), SO3 (2%)
Find the percentage of C3S and C3A.
% of C3S = 4.07 (CaO) – 7.6 (SiO2) – 6.72 (Al2O3) – 1.43 (Fe2O3) – 2.85 (SO3)
= 4.07 x 50 – 7.6 x 15 – 6.72 x 5 – 1.43 x 3 – 2.85 x 2
= 45.91 %
% of C3A = 2.65(Al2O3) – 1.69 (Fe2O3)
= 2.65 x 5 – 1.69 x 3
= 8.18 %
What are the initial and final setting times of cement ? How are they experimentally determined ?
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