【摘要】 本文研究了不同粉煤灰掺量时新拌混凝土的工作性能及对硬化混凝土的性能影响,表明Ⅱ级粉煤灰在混凝土中的掺量不宜大于21%．在此范围内,可以起到改善新拌混凝土工作性能,提高混凝土折压比及后期抗压强度,减小混凝土收缩,增大混凝土弹性模量的作用更多还原

【Abstract】 This article studied the influence of different Fly-ash dosages on the workability of fresh-mixed concrete and the performance of hardened concrete,it indicated that the dosage of classⅡFly-ash should preferably not to be more than 20%,and within this range,it could improve the workability of fresh-mixed concrete and increase the flexu- ral strength to compression strength ratio as well as com- pression strength at later ages,furthermore,it could reduce the shrinkage of concrete and increase the modular of elas- ticity.更多还原