稻壳纤维粒径和掺量分数对水泥复合材料性能的影响
Effect of rice husk fiber particle size and content on the properties of cement composite

以稻壳纤维（Rice husk fiber，RHF）为增强材料，以水泥为基体，制备了RHF/水泥基复合材料。研究了粒径对RHF在水泥基体中分散性能的影响；并以RHF粒径和掺入质量比为考察因素，采用响应曲面法，以RHF/水泥基复合材料的密度、抗折强度、含水率、吸水率和导热系数为响应值，建立数学模型，对RHF/水泥基复合材料的成型工艺进行优化设计。结果表明：RHF的粒径越小，在水泥基体中分散性能越好，粒径为150 μm的RHF分散系数达到最大值，为0.981；响应曲面模型分析表明RHF的粒径为150 μm、掺入质量为水泥质量的3%时，RHF/水泥基复合材料的性能达到最优，此时RHF/水泥基复合材料的密度为1 559.26 kg/m3，抗折强度为9.38 MPa，含水率为7.05%，吸水率为16.71%，导热系数为0.50 W/（m·K），达到了建筑行业标准JC/T 411—2007的要求。 RHF(Rice husk fiber, RHF) was added into cement as reinforced materials to prepare RHF/cement composites.The effect of particle size on the dispersion properties of RHF in cement matrix was studied. And take the particle size and mass ratio of RHF to cement as factors, the density, flexural strength, water content, water absorption and thermal conductivity of RHF/cement composite as response value, the mathematical model was established using the response surface method, the molding process of RHF/cement composites was optimized. The results show that the smaller particle size of RHF, the better dispersion of RHF in cement, the dispersion coefficient reaches the maximum value of 0.981 when particle size is 150 μm.The response surface model analysis shows that the RHF/cement composite achieves optimal when particle size is 150 μm and mass ratio is 3%, under this process, the density, flexural strength, water content, water absorption and thermal conductivity of RHF/cement reach 1 559 kg/m3, 9.38 MPa, 7.05%, 16.71%, and 0.50W/(m·K), respectively, which are all up to JC/T 411-2007. 天津市科技特派员项目（16JCTPJC44900）