Activated blended cement containing high volume coal fly ash

This study has investigated the strength and equilibrium water extraction of blended cement containing high volume coal fly ash and activator CaCl₂. The addition of CaCl₂ increased the strength of cement very significantly. Equilibrium water extraction indicated that the addition of CaCl₂ decreased the pH of the pore solution, but accelerated the pozzolanic reactions between coal fly ash and lime, which became more obvious when the volume of fly ash in the cement was increased from 50–70%. Results from both strength and water extraction testing could conclude that CaCl₂ is a good activator for the activation of pozzolanic reactivity of fly ash and for the improvement of early properties of fly ash cement and concrete.