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1前言随着自然资源的日益紧张和技术的不断进步,粉煤灰已经作为一种必不可少的原料,在混凝土中掺入适量的优质粉煤灰部分取代水泥作为胶凝材料可以改善混凝土和易性、提高混凝土后期强度、减少大体积混凝土结构裂缝、提高混凝土耐久性并获得较低经济成本。但由于粉煤灰在混凝土中早期活性低,水化反应开始时间晚,造成混凝土早期强度偏低,混凝土强度不能满足工程进度要求,而施工现场又不能很好的满足
1 Introduction With the increasing tension of natural resources and continuous improvement of technology, fly ash has been used as an indispensable raw material, and concrete is mixed with proper amount of high-quality fly ash to partially replace cement as a cementitious material to improve concrete and Workability, improve the late strength of concrete, reduce the mass concrete structure cracks, improve the durability of concrete and get lower economic costs. However, the early activity of fly ash in concrete is low, the hydration reaction starts later, causing the early strength of concrete to be lower. The strength of concrete can not meet the requirements of engineering progress, and the construction site can not meet well