纳米Fe2O3和纳米Fe3O4水泥基材料的力学性能与作用机理  

Mechanical Properties and Action Mechanism of Nano-Fe2O3 and Nano-Fe3O4 Cement-based Material

作　　者：董双快 赵振华[2] 吴福飞[2] 王红 黄胜方 徐明亮 DONG Shuang-kuai;ZHAO Zhen-hua;WU Fu-fei;WANG Hong;HUANG Sheng-fang;XU Ming-liang(Academic Affairs Office,Guizhou Normal University,Guiyang 550025,China;School of Materials and Architectural Engineering,Guizhou Normal University,Guiyang 550025,China)

机构地区：[1]贵州师范大学教务处,贵州贵阳550025 [2]贵州师范大学材料与建筑工程学院,贵州贵阳550025

出　　处：《水电能源科学》2020年第9期126-129,138,共5页Water Resources and Power

基　　金：贵州省教育厅青年科技人才成长项目(黔教合KY字[2018]125号);贵州省科技厅-贵州师范大学联合基金项目(黔科合LH字[2017]7351号);贵州师范大学2016年博士科研启动项目(0517073);贵州省科学技术基金项目(黔科合J字LKS[2013]41号)。

摘　　要：为研究纳米Fe2O3和纳米Fe3O4对水泥基材料的改性作用,通过物理试验分析纳米Fe2O3和纳米Fe3O4对低水胶比水泥基材料力学性能、耐久性及渗透性的影响,并分析其作用机制。结果表明,0.5%~4.0%纳米Fe3O4和纳米Fe2O3能降低低水胶比水泥基材料的扩展度和坍落度,分别降低了1.38%~9.66%/3.45%~16.55%和2.33%~18.60%/4.65%~37.21%,纳米Fe2O3对水泥基材料扩展度和坍落度的影响是纳米Fe3O4的1.7~2.5、1.8~2.0倍。0.5%~4.0%纳米Fe2O3和Fe3O4能提高水泥基材料的抗折/抗压强度和渗透性能,掺量分别以0.5%和1.0%为宜,但纳米Fe2O3对水泥基材料抗折/抗压强度和渗透性能的改性作用优于纳米Fe3O4。综合来看,由于纳米材料具有比表面积大和吸附性强等特点,既能改善水泥基材料的流动性,还能细化水泥基材料孔结构和促进水泥水化的作用。因此,纳米Fe2O3和纳米Fe3O4能在一定程度上改善低水胶比水泥基材料的力学性能和耐久性。In order to study the modification effect of nano-Fe2O3 and nano-Fe3O4 on cement-based materials,the action mechanism and impact on the mechanical properties,durability and permeability of cement base material with low water/cement ratio were analyzed by physical test.The results show that 0.5%-4.0%nano-Fe2O3 and nano-Fe3O4 can reduce the degree of extension and slump of cement base material with low water/cement ratio,which is reduced by1.38%-9.66%/3.45%-16.55%and 2.33%-18.60%/4.65%-37.21%,respectively.The influence of the slump and extension degree of cement base material for Fe2O3 are 1.7-2.5 and 1.8-2.0 times of nano-Fe3O4 particles.0.5%-4.0%nanoFe2O3 and nano-Fe3O4 can improve bending/compressive strength and permeability coefficient of cement base material,the best dosage is 0.5%and 1.0%,respectively.But the modification effect of nano-Fe2O3 for cement base material bending/compressive strength and permeability coefficient is better than that of nano-Fe3O4 particles.Because nano-Fe2O3 and nano-Fe3O4 particles have characteristics of large specific surface area and strong adsorption,they can not only improve the liquidity of cement base material,but also refine the pore structure and promote cement hydration.Therefore,nano-Fe2O3 and nano-Fe3O4 can improve the mechanical properties and durability of cement base material to a certain extent.

关 键 词：纳米Fe2O3 纳米FE3O4 力学性能 耐久性 作用机制 

分 类 号：TU528.01[建筑科学—建筑技术科学]