外加剂对水泥净浆水化热的影响

采用直接测定法测试了矿物、化学外加剂对水泥净浆的水化热的影响，并对外加剂降低或提高水化物的原理作了一些探讨。结果表明，粉煤灰和矿渣等矿物外加剂能明显在降低水泥净浆的水化热和温升。FDN-5型减水剂、糖密缓凝剂等化学外加剂能不同程度地降低水泥净浆的水化热和温升，推迟热峰出现时间。Na2SO4早强剂会提高水化热和温升，且使热峰出现时间提前。松香引气剂对水化热和温升影响不明显。

Effect of Admixtures on Heat of Hydration of Fresh Cement

The effects of different kinds of mineral and chemical admixtures on the heat of hydration of the fresh cement were investigated by means of measurement of the heat of hydration and the principles of reducing or raising the heat of hydration were probed too in this paper. The results show that the admixtures of both flyash and mineral can obviously reduce the heat of hydration and temperature rise of the fresh cement. The admixtures, such as the water reducing agent of FDN 5 and the retarding agent of the molasses can also reduce the heat of hydration and temperature rise of the fresh cement and delay the advent of the thermal spike. The early strength agent of Na 2SO 4 can increase the heat of hydration and temperature raise, meanwhile it advances the advent of the thermal spike. The effect of the air entraining agent of rosin on the heat of hydration and temperature rise isn't obvious.