EXPERIMENTAL STUDY ON COMPREHENSIVE STRENGTH OF RECYCLED AGGREGATE CONCRETE

In consideration of the increasing waste concrete (WC) and its harm,there is a pressing need of rational development and scientific use of it. In view of the multi-route source and the diversified quality of recycled aggregate (RA) as well as its impact on the quality of recycled aggregate concretes (RAC),four kinds of waste concretes of different sources,such as old house demolition,high-strength pile foundation,municipal administration and scientific research,which are of the most typical representative,are selected and fragmented into four kinds of recycled aggregates,then four replacement ratios of 25%,50%,75% and 100% respectively are chosen after purification and crosstie of the four recycled aggregates,which are configured into four recycled aggregate concretes by referring to the correlative standards and the cubic comprehensive strength and the prism comprehensive strength are tested according to the standard test. The aim of the above experiment is to make sure and discuss the impact on cubic comprehensive strength and prism comprehensive strength of recycled aggregate concrete of different RA sources. The result indicated that the effects of replacement ratio of recycled aggregate have a great impact on the cubic comprehensive strength and the prism comprehensive strength while the impact from recycled aggregate of different sources is not distinct. What' s more,it is pointed out that the mineral admixture is another important factor that influences the prism comprehensive strength.