Feasibility of Utilizing Recycled Aggregate Concrete for Revetment Engineering
CHANG Honglei1, CHEN Fanyu2, JIN Zuquan3, WANG Guangyue2, LIU Jian1
1 School of Qilu Transportation, Shandong University, Jinan 250002, China 2 School of Civil Engineering, Shandong University, Jinan 250061, China 3 School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China
Abstract: Local recycled aggregates in revetment of the lower Yellow River were used to design a series of concrete mix ratios to comprehensively evaluate the compressive strength, flexural strength, frost resistance and carbonization resistance. By testing the compressive strength of recycled concrete with different ratio of single coarse aggregate, single fine aggregate and mixed coarse and fine aggregate, the mixing ratios of compressive strength greater than 40 MPa and the replacement rate of recycled aggregates not less than 50% are preferred: RSF50, RSF70, RSF100. The experimental results show that the mechanical properties, frost resistance and carbonization resistance of the preferred three mix ratio recycled concrete are generally weaker than normal concrete, but all can meet the performance requirements of slope protection projects in the lower Yellow River. The comprehensive performance of the three mix ratios is ranked as follows: RSF50>RSF70>RSF100. Considering the replacement rate of recycled aggregate, RSF70 has the best comprehensive performance, which is recommended for the preparation of slope protection blocks and for application in actual bank protection projects.