【摘要】 研究了在用水量一定时,砂率、水灰比、粉煤灰对混凝土坍落度的影响,并分析了粗集料最大粒径对坍落度的影响。结果表明:砂率有一个最佳值,此值下坍落度最大;不同水灰比的混凝土拌合物,通过适当增减砂率,可保持坍落度基本不变;与基准混凝土(不掺粉煤灰)相比,内掺II级粉煤灰的混凝土坍落度增大,内掺III级粉煤灰的混凝土坍落度减小。更多还原

【Abstract】 Using water quantity stably,influence of sand percentage,water-cement ratio,fly ash on concrete slump was studied,influence of maximum diameter of coarse aggregate on concrete slump was analyzed.The results indicate that sand percentage has a groove,and slump has a maximum numerical value in the groove.By adding or reducing sand percentage,it is attainable to keep the slumps of concrete with different water-cement ratio unchangeable.Compared with normal concrete,into which fly ash is not mixed,the slump of II-grade fly ash concrete increases,the slump of III-grade fly ash concrete minishes.更多还原