Abstract
The recycled aggregate concrete (RAC) is widely applied in existing engineering, due to the great economy and environmental protection. However, there are several disadvantages of RAC: complex existing mix design methods, lower strength, and brittleness. This chapter initially presents a simple mixed design method. A series of RAC with different stable strength grades can be mixed promptly by the proposed method. Then, this chapter presents a comprehensive experimental study on the RAC composite cylinders, including the RAC filled in steel tube, the GFRP confined RAC, and the double confined RAC. The test results show that the confining effect can improve the behaviors of the composite column, and the double confining effect can restrict the local buckling of the steel tube. Finally, three types of constitutive models are established and verified for the corresponding confined RAC.
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