响应曲面法优化高强硅酸盐水泥熟料矿物组成的研究

硅酸盐水泥熟料的矿物组成对水泥力学性能有重要影响,传统方法通过正交试验法优化水泥熟料矿物组成,试验量大,且难以获得水泥熟料矿物组成最佳点。利用响应曲面法(RSM)优化硅酸盐水泥熟料矿物组成,基于Box-Behnken试验设计方法,揭示了石灰饱和系数(KH)、铝率(IM)、硅率(SM)与水化28 d抗压强度之间的关系,并以此建立二次模型,获得其最佳值。研究结果表明,KH、IM和SM最佳值分别为0.94、1.7和2.2,并发现采用该率值设计的水泥熟料,所制备的水泥硬化浆体孔隙率最低,因此,响应曲面法是优化硅酸盐水泥熟料矿物组成以提高水泥力学性能的有效方法,并有望改善水泥的耐久性。

Optimizing Mineral Composition of High Strength Portland Cement Clinker Based on Response Surface Methodology

The properties of hydrated Portland cement clinker mostly depend on mineral compositions. The traditional method optimizes the mineral composition of cement clinker by orthogonal test method. The test quantity is large and it is difficult to obtain the optimal point of cement clinker mineral composition. In this paper, the response surface methodology (RSM) was used to optimize the mineral composition of Portland cement clinker. Based on the Box-Behnken test design method, the relationship between lime saturation factor (KH), alumina modulus (IM), silica modulus (SM) and 28 d compressive strength was revealed and established quadratic model to obtain the best values of KH, IM and SM. The results show that the best values of KH, IM, SM are 0.94, 1.7 and 2.2 respectively, and it is found that the cement clinker designed with this modulus value has the lowest porosity of the hardened cement paste. Therefore, RSM is an effective method for optimizing the mineral composition of Portland cement clinker, which improves the mechanical properties of cement, and it is expected to improve the durability of cement.