Table 5: Compressive strength under different ratios of cement to sand.

FormulaCement-sand ratioWater-solid ratio Compressive strength (MPa)
7d28d

11 : 2.00.1110.412.4
21 : 1.50.1211.915.3
31 : 1.00.1514.719.0
41 : 0.60.1814.318.1
51 : 00.227.916.5