氧化石墨烯复合PVA纤维增强水泥基材料的力学性能及耐久性研究

为解决混凝土耐久性差、脆性大等问题,研究了氧化石墨烯(GO)复掺聚乙烯醇(PVA)纤维对低水灰比水泥基材料力学性能及耐久性能的影响.利用Hummers法制备GO,并表征GO的结构和性能,通过测试分析了不同配合比砂浆的力学性能和耐久性,并通过MIP(压汞法)和SEM(扫描电镜)分析了氧化石墨烯以及PVA纤维对水泥基材料的改性机理.结果表明GO和PVA纤维均能提高水泥基材料的力学性能以及耐久性.GO复掺PVA纤维可以显著改善水泥基材料孔结构,降低孔隙率,提高水泥基材料抗氯离子渗透性能并降低水泥基材料收缩率.

Research on Mechanical Properties and Durability of Graphene Oxide Composite PVA Fiber Reinforced Cement-based Material

In order to solve the problems of poor durability and brittleness of concrete,In this paper,the effect of graphene oxide(GO)blended with Polyvinyl alcohol(PVA)fiber on the durability of cement-based materials was studied.GO was prepared by Hummers method and the structure and properties of GO were characterized.The mechanical properties and durability of mortars with different mix ratio were tested and analyzed,and the modification mechanism of GO and PVA fibers on cement-based materials was analyzed by MIP(Mercury intrusion porosimetry)and SEM(scanning electron microscope).The results show that GO and PVA fiber can improve the mechanical properties and durability of cement-based materials.GO composite PVA fiber can significantly optimize the pore structure of cement-based materials,reduce porosity,improve the resistance to chloride ion penetration and reduce the shrinkage of cement-based materials.