Experimental research on the flexural strength of recycled coarse aggregate concrete

In order to study the flexural strength of concrete with different replacement percentage of recycled coarse aggregate, the test were designed and carried out on 33 concrete specimens whose replacement percentage of recycled coarse aggregate are 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%, respectively. According to the experiment, the flexural strength of recycled aggregate concrete (RAC) is obtained, and the influence of replacement percentage of recycled coarse aggregate on the flexural strength is analyzed. After the flexural test, the same specimens were used for compression test, and the cubic compressive strength is also acquired. The results show that the flexural strength and cubic compressive strength of the recycled aggregate concrete approximate to those of normal concrete. The ratio of flexural strength to cubic compressive strength is 0.12 for recycled aggregate concrete.