Table 2: Chemical composition of cement, fly ash, and clay (%).

ItemsSiO2Fe2O3Al2O3CaOMgOf·CaOK2ONa2OR2OSO3Loss

Cement21.75.04.162.14.80.10.70.2
Fly ash59.08.821.65.11.50.80.20.70.61.4
Clay55.65.915.05.64.6