Abstract: To explore the feasibility of using rice husk, an agricultural waste, for preparing lightweight and high strength building materials, the original rice husk mortar was made by using the original rice husk instead of the engineering sand, mixed with polypropylene fiber with different blending ratio and length, and made with cement and water. We analyzed the influence of replacing part of engineering sand with original rice husk on the properties of mortar through experiments. The compressive strength, flexural strength and density of rice husk mortar were studied through macroscopic experimental studies. The results showed that the proper addition of rice husk could improve the compressive and flexural strength and reduce the density of the mortar compared with the original mortar. The 28 d compressive and folding strengths of rice husk mortar with a rice husk content of 40% and polypropylene(PP) fiber content of 0.1% and the PP fiber length of 6 mm were the highest, which were 9.61 MPa and 2.45 MPa, respectively. The order of the influence of each factor was as follows: rice husk content>fiber length>fiber volume.

Key words: rice husk mortar, polypropylene fiber, compressive strength, flexural strength, density

摘要： 为探究利用农业废弃物——稻壳制备轻质高强度建筑材料的可行性,采用原状稻壳替代部分工程砂,按不同掺量及纤维长度掺入聚丙烯纤维,并与水泥和水制作原状稻壳砂浆,通过试验分析了原状稻壳替代部分工程砂对砂浆性能的影响,对稻壳砂浆试块的抗压强度、抗折强度、密度进行了宏观试验研究。结果表明:与原状砂浆相比,适量添加稻壳有助于提高砂浆的抗压抗折强度并降低密度;稻壳掺入量为40%、聚丙烯纤维掺入量为0.1%、纤维长度为6mm的稻壳砂浆28d抗压、抗折强度最高,分别为9.61MPa和2.45MPa。各因素的影响重要程度是:稻壳掺量＞纤维长度＞纤维体积。

关键词: 稻壳砂浆, 聚丙烯纤维, 抗压强度, 抗折强度, 密度