In this paper, the writer chose the adding means of PFA replacing sand, and put forward the mix ratio design of concrete by orthogonal analysis experiments.
通过正交试验设计，采用粉煤灰代砂法掺入再生混凝土，并进行配合比设计。
It shows that the modified overall calculation method is more scientific and rational and exact on mix ratio design of self-compacting concrete.
结果表明：改进的全计算法是一种科学、合理、准确的自密实混凝土配合比设计方法。
The mix design of strong concrete should follow the principles of low water-cement ratio, low sand ratio and high bone-glue ratio, thus the relatively satisfying effect can be achieved.
高强度混凝土的配合比设计应该遵循低水灰比、低砂率、高骨胶比的原则，这样才能达到比较理想的效果。
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