基于排队评分法与矩阵分析法的多指标再生混凝土力学性能的优选研究

为了研究多指标情况下再生混凝土力学性能的最优组合,以再生骨料替代率、粉煤灰替代率和钢纤维掺入率为因素,抗压强度、劈拉强度、抗折强度、拉压比和折压比为指标,分别利用排队评分法与矩阵分析法对再生混凝土正交试验结果进行分析.结果表明:各因素对再生混凝土力学性能影响的大小顺序依次为钢纤维掺入率、粉煤灰替代率、再生骨料替代率; 再生混凝土力学性能的最优组合为A4B2C4,即再生骨料替代率为100%、粉煤灰替代率为10%、 钢纤维掺入率为1.8%; 矩阵分析法所得结果与正交试验分析结果更为接近,这表明矩阵分析法在确定最佳组合方案时优于排队评分法.

Study on optimum selection of mechanical properties of multi-index RAC based on queuing scoring method and matrix analysis method

In order to study the optimal combination of mechanical properties of recycled aggregate concrete(RAC)under multi-index conditions, the orthogonal test results of RAC were analyzed by queuing scoring method and matrix analysis method, taking the replacement rate of recycled aggregate, fly ash and steel fiber as factors, and the compressive strength, splitting tensile strength, flexural strength, tension-compression ratio and flexural-compression ratio as indicators. The order of the influence of various factors on mechanical properties of RAC is the incorporation rate of steel fiber, the replacement rate of fly ash and the replacement rate of recycled aggregate. The optimal combination of mechanical properties of RAC 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%. The results of matrix analysis method are closer to that of orthogonal experiment, which shows that matrix analysis method is superior to queuing scoring method in determining the best combination scheme.