Experimental Study on the Variation Law of Elastic Modulus of Recycled Aggregate Concrete

For meeting the different requirements of actual conditions in the various engineering field,the paper study the variation law of the elastic modulus of various strength recycled aggregate concrete from C20 to C40 with the different replacement rate of recycled coarse aggregate.Experimental results show that some factors such as aggregate,cement matrix,interfacial transition zone and so on have different influence on concrete structure between recycled aggregate concrete and base concrete.Moreover,these factors lead to the elastic modulus of the same strength recycled aggregate concrete is obviously decreased with the increasing of the replacement rate of recycled coarse aggregate.According to the experimental data and theoretical analyses,the relational expression is obtained between the elastic modulus of recycled aggregate concrete,the elastic modulus of base concrete and the replacement rate of recycled coarse aggregate.Combined with the different requirements of elastic modulus of recycled aggregate concrete of the actual projects,it can make an estimate of the replacement rate of recycled coarse aggregate.