Study of properties of fly ash cements

Laboratory experiments in the cement manufacturer of LafargeHolcim- Oujda in Morocco were conducted to investigate the effect of addition of fly ash on Ordinary Portland Cement OPC. In this study a portion of this cement was replaced by fly ash with different dosages (15%, 25%, 35% and 45%). The results of these experiments showed technical benefits of fly ash cements compared to Portland cements: - Less water demand, - Less heat of hydration and less risk of early age cracking and High late strength gain. However the inferior property of fly ash cements is lower early strength.