粉煤灰在大体积混凝土中作用机理研究

Research on the action mechanism of fly ash in mass concrete

针对粉煤灰混凝土在标准养护条件和变温养护条件下强度发展进行研究。发现标准养护条件下粉煤灰混凝土早期强度发展缓慢,而变温养护条件强度迅速增长;对比研究粉煤灰对水化热和绝热温升影响,发现粉煤灰可显著降低水化热和绝热温升;在绝热温升试验中发现粉煤灰水化放热峰,而水化热试验中未见粉煤灰放热峰。

This paper studies the strength development of fly ash concrete in standard curing condition and under variable temperature curing condition. The result reflects that the early strength of fly ash concrete develops slowly under the standard curing condition while grows rapidly under variable temperature curing condition. The comparative study of influence by fly ash on hydration heat and adiabatic temperature rise shows that the fly ash can significantly reduce the hydration heat and adiabatic temperature rise, and the exothermic peak of fly ash hydration is found in the adiabatic temperature rise test but is not found in the hydration heat test.