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Abstract
In order to study the optimal combination of mechanical properties of recycled aggregate concrete under the condition of multiple indexes, the orthogonal test results of recycled concrete were analyzed by queuing score method, taking the replacement rate of recycled aggregate, replacement rate of fly ash and incorporation rate of steel fiber as factors, and the compressive strength, splitting tensile strength, flexural strength, tension-compression ratio and flexural-compression ratio as indicators. The results show that the incorporation rate of steel fiber has the greatest influence on the mechanical properties of recycled aggregate concrete, followed by the replacement rate of fly ash, and finally the replacement rate of recycled aggregate. The optimum combination of recycled aggregate concrete is A4B2C4, that is, the replacement rate of recycled aggregate is 100%, the replacement rate of fly ash is 10%, and the incorporation rate of steel fiber is 1.8%. Queuing score method can accurately determine the influence of factors on recycled aggregate concrete and optimal combination in orthogonal tests.
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Details
1 School of Engineering, the Tourism College of Changchun University, Changchun, Jilin, 130607, China
2 School of Civil Engineering, Changchun Institute of Technology, Changchun, Jilin, 130012, China