掺粉煤灰和不同外加剂对水泥水化放热过程的影响

Effect of Fly Ash and Admixtures on the Hydration Heat Evolution Process of Portland Cement

通过水化热测量研究了掺加缓凝型减水剂、引气剂和粉煤灰对硅酸盐水泥的水化放热过程的影响。结果表明,掺入缓凝型减水剂能不同程度地延缓水泥的水化放热过程,降低水泥的水化热,掺入引气剂对水泥水化放热几乎没有影响,而掺粉煤灰可显著降低水泥水化热。

The effects of superplasticizers, air-entraining agent and fly ash on the hydration heat evolution process of Portland cement were investigated through direct hydration heat measurement. The results show that all the superplasticizers can reduce the hydration heat and retard the heat evolution process. The air-entraining agent has little effect on the hydration heat of the cement. But the fly ash remarkably reduces both the hydration heat and the heat evolution rate.