聚丙烯酸酯乳液改性稻壳–水泥复合材料力学性能

Mechanical Properties of Polyacrylate Emulsion Modified Rice Husk-Cement Composites

摘要: 利用粉碎后的稻壳增强水泥制得复合材料。采用5%硅酸钠溶液对稻壳进行预处理以及向复合材料中添加0.6 kg/m³的聚乙烯醇纤维，选择不同掺量的聚丙烯酸酯乳液对该稻壳–水泥复合材料进行改性，研究它们对稻壳-水泥复合材料力学性能的影响。采用傅里叶红外、X射线衍射、扫描电子显微镜等手段对水泥复合材料进行表征，进而探寻其改性机理。结果表明：聚丙烯酸酯乳液能有效地提高稻壳–水泥复合材料力学性能；用5%硅酸钠溶液处理稻壳后，复合材料的力学性能得到大幅度提高；聚乙烯醇纤维具有成团倾向，在水泥基体中分散性不好，没有充分发挥其增强效果。

Abstract: Composite materials were manufactured with crushed rice husk reinforced cement. Rice husk- cement composites were modified by different dosage of polyacrylate emulsion. 5% sodium silicate solution treated on rice husk and adding 0.6 kg/m³ polyvinyl alcohol fibers’ impact on the mechanical properties of rice husk-cement composites were studied. The cement composites were characterized using Fourier transform infrared, X-ray diffraction and scanning electron microscopy, and then the modification mechanism were explored. The results showed that: polyacrylate emulsion can effectively improve the mechanical properties of rice husk-cement composites; the mechanical properties of cement composites had been greatly improved with 5% sodium silicate solution treated on rice husk; polyvinyl alcohol (PVA) fibers had the tendency to conglobation and the poor dispersion in the cement, its mechanical properties were not enhanced.