Compositions of alites in clinkers

Many workers have analysed alites from ordinary production clinkers by X-ray microanalysis (T2,T3,K 1,G3,B2,G4,S1,H3,H4) or chemical analysis of 

Pure C3S contains 73.7% of CaO and 26.3% of SiO. Alites in clinkers typically contain 3-4% of impurity oxides, i.e. oxide components other than those present in the pure compound. Boikova (B4) found a positive correlation between the total percentage of impurity oxides in the alite (/ ) and the percentage of MgO in the clinker (M ). Her re.sults are approximately lilted by the equation = 0.1 -1-2.1. 

Correlations have also been found between the percentages of individual impurity oxides in the alite and in the clinker. In the following discussion, we shall use symbols of the type and to denote these quantities, where O is the cement chemical symbol for the oxide and the suffixes a and c indicate alite and clinker, respectively. For MgO, Kristmann s (Kl) data indicate the approximate relations = 0.67 x for 3.0 and 2.0 for 3.0. Yamaguchi and Takagi (Yl) and Terrier (T2) found similar correlations, but with slopes of 0.74 and 0.45, respectively. For AI2O3, Kristmann (Kl) did not find any significant correlation, but for FejO, his data indicate the approximate relation = 0.33 x for F 4%. Boikova (B4) reported ratios of 0.34 to 0.82 for MJM., 0.09 to 0.23 for AJA and 0.17 to 0.36 for F3/F,. 

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