Effect of aggregate to research C80～C90 high-strength concrete

The impact of coarse aggregate gradation and strength,fineness modulus of sand and sand ratio on research C80~C90 high-strength concrete was studied.The result of the experiment showed that coarse aggregate gradation to achieve lower voidage help to improve the strength of concrete,the effect of coarse aggregate strength to concrete strength closed to its strength of mortar.Fineness modulus of sand within 2.6~2.9 had little effect on the the performance of concrete.There is an optimum value of the sand ratio,when it's about 41% the comprehensive performance of concrete was better.