【摘要】 为探索石灰石煅烧黏土复合胶凝材料体系中石灰石粉和煅烧黏土的最优配合比，本文采用响应面法进行优化试验研究，以普通硅酸盐水泥、煅烧黏土和石灰石粉掺量作为控制变量，砂浆的28 d抗压强度及28 d抗折强度为响应变量进行力学性能测试，建立矿物掺合料复配比例与力学性能之间的回归模型。在矿物掺合料为15%、30%、45%(质量分数，下同)的条件下，采用回归模型对石灰石煅烧黏土复合胶凝材料体系中石灰石粉与煅烧黏土的配合比进行优化，优化结果分别为：煅烧黏土占比15%,不含石灰石粉；煅烧黏土占比25%,石灰石粉占比5%;煅烧黏土占比30.5%,石灰石粉占比14.5%。上述体系的28 d抗压强度预测值分别为63.26、58.57、48.10 MPa,试验实测值分别为63.74、57.21、47.02 MPa,预测值与实测值之间的相对误差均小于5%。本研究为石灰石煅烧黏土复合胶凝材料体系最优配合比问题提供了新的解决思路和试验参考。更多还原

【Abstract】 To explore the optimal ratio of limestone powder and calcined clay in the limestone calcined clay composite cementitious material system, the response surface method was adopted to optimize. The prediction model was established by taking ordinary Portland cement, calcined clay and limestone powder as variable factors, and 28 d compressive strength and 28 d flexural strength of cement mortar as response variable. Mechanical properties were tested, and the regression model between the proportion of mineral admixture compounding and the mechanical properties was established. At the conditions of mineral admixture proportion of 15%, 30% and 45%(mass fraction, the same below), the regression model was used to optimize the mixing ratio of limestone powder and calcined clay in the limestone calcined clay composite cementitious material system. The optimization results are as follows: calcined clay accounts for 15%, without limestone powder. Calcined clay accounts for 25%, and limestone powder accounts for 5%. Calcined clay accounts for 30.5%, and limestone powder accounts for 14.5%. The predicted values of 28 d compressive strength of system are 63.26, 58.57 and 48.10 MPa, respectively, while the measured values are 63.74, 57.21 and 47.02 MPa, respectively. The absolute relative errors between the predicted and measured values are less than 5%. It provides a new solution idea and test basis for the optimal proportioning problem of limestone calcined clay composite cementitious material system.更多还原