Influences of coal fly ash containing ammonium salts on properties of cement paste

This paper aims to investigate the influence of coal fly ash containing ammonium salts on properties of cement paste. Fly ash was incorporated at percentage of 20% by weight of the total binder to replace Portland cement. Ammonium hydrogen sulfate (NH3HSO4) or ammonium sulfate ((NH3)2SO4) were introduced at percentages of 3.0%-6.0% or 1.5%-3.0% by fly ash weight. Compressive strength, setting time and hydration heat were evaluated on variable...