Table 2: Typical cement contents of classes of concrete used in investigated area Mix High workability Medium workability low workability E 19mm-250, 38mm 232, 75mm 208, 150mm 163 D 38mm 325, 38mm 285 19mm 285 38mm 267, 75mm 220, 150mm 186 B 19mm 365, 38mm – 330