人工砂粉煤灰混凝土正交试验研究

通过正交试验研究了水灰比、粉煤灰替代水泥率、超量系数和砂率对人工砂粉煤灰混凝土工作性及28 d抗压强度的影响规律.结果表明:水灰比对新拌混凝土的工作性和硬化混凝土的强度影响明显,粉煤灰替代水泥率的影响也较大,但超量系数和砂率的影响均不显著.通过效应估计,提出了配合比设计表,进行了复核试验,与人工砂混凝土和天然河砂混凝土进行了技术指标对比分析.

Orthogonal Experiment Study on Concrete Composed of Manufactured Sand and Fly Ash

The orthogonal experiment has been carried out to study the effects of the water to binder ratio,the fly ash displacing cement ratio,the exceeding coefficient and the sand ratio on the workability and the twenty-eight-day compressed strength of the concrete composed of the manufactured sand and the fly ash.It's shown that the water to binder ratio seriously affects the performances of the concrete and the fly ash displacing cement ratio affects secondly,and the influence of the exceeding coefficient and the sand ratio isn't basically noticeable.In addition,with the effect estimate method,The design table of concrete mixes is proposed,and the results are mainly satisfactory with the check tests.The technological coefficients of concrete composed of manufactured sand and fly ash are compared with the manufactured-sand concrete and the natural-sand concrete.