基于正交设计方法的相似材料配比试验研究

Research on Similar Material Proportioning Test Based on Orthogonal Design

摘要: 制备的相似材料以水泥和石膏为胶结材料、石英砂和重晶石粉为骨料，将骨胶比、水膏比和重晶石粉比作为控制因素，设计正交试验，对制作出的相似材料进行称重和单轴抗压强度测试，得到了不同配比下相似材料的密度、单轴抗压强度和弹性模量。采用极差分析法分析了各因素的敏感性，研究了骨胶比、水膏比以及重晶石粉比对相似材料物理参数的影响规律。研究表明：随着骨料的比例增大，试件的密度逐渐减小；密度随水泥的比例和重晶石粉比例的增大而增大，重晶石粉比的增大幅度更大。随着骨料的比例变大，试件的抗压强度和弹性模量减小，特别是当骨胶比从5:1变为6:1时，试件的抗压强度和弹性模量大幅度减小；随着水泥的比例和重晶石粉比的增大，试件的抗压强度和弹性模量逐渐增大。

Abstract: The prepared similar materials were made with cement and gypsum as the binding agents, quartz sand and barite powder as the aggregate, with the bone-to-cement ratio, water-to-gypsum ratio, and barite powder ratio as controlled factors. A factorial experiment was designed, and the weight and uniaxial compressive strength of the prepared similar materials were tested. The density, uniaxial compressive strength, and modulus of elasticity of the similar materials were obtained at different ratios. The sensitivity of each factor was analyzed using the range analysis method, and the influence of the bone-to-cement ratio, water-to-gypsum ratio, and barite powder ratio on the physical parameters of the similar materials was studied. The results show that as the aggregate ratio increases, the density of the specimens decreases; the density increases as the ratio of cement and barite powder increases, and the increase in the ratio of barite powder is more significant. As the aggregate ratio increases, the compressive strength and modulus of elasticity of the specimens decrease, especially when the bone-to-cement ratio changes from 5:1 to 6:1, the compressive strength and modulus of elasticity of the specimens decrease significantly. As the ratio of cement and barite powder increases, the compressive strength and modulus of elasticity of the specimens increase gradually.