氧化石墨烯改性纤维增强水泥基材料的拉伸性能

Tensile Properties of Fibers Reinforced Cementitious Materials Modified by Graphene Oxide

为了提高聚乙烯醇(PVA)纤维增强水泥基材料的力学性能,将氧化石墨烯(GO)引入PVA纤维增强水泥基材料中,探究GO掺量在0%~0.05%范围内对材料单轴拉伸性能的影响.结果表明:掺入适量的GO能够有效提高材料的单轴拉伸性能,当GO掺量为0.01%时,28 d时材料的初裂拉伸强度、极限拉伸强度和极限拉伸应变均达到最大值,与未掺GO的对照组相比分别提高了26.97%、31.28%、23.25%;适量的GO可以优化孔隙结构,减少材料内部缺陷,促进水化产物的生成,使微观结构致密化,增强纤维和基体间的界面结合力,从而改善PVA纤维增强水泥基材料的宏观性能.

In order to improve the mechanical properties of cementitious materials reinforced with polyvinyl alcohol(PVA)fibers,graphene oxide(GO)was introduced into cementitious materials reinforced with PVA fibers,and the effects of GO dosage in the range of 0%-0.05%on the uniaxial tensile properties of the materials were investigated.The results show that the appropriate GO dosage can effectively improve the uniaxial tensile properties of the materials,and the initial crack tensile strength,ultimate tensile strength and ultimate tensile strain of the cementitious materials reaches the maximum value,increased by 26.97%,31.28%and 23.25%,respectively compared with the control group without GO at the age of 28 d,when GO dosage is 0.01%.An appropriate GO dosage can optimize the pore structure,reduce internal defects in the material,facilitate the formation of hydration products,enhance the density of the material’s microstructure,and improve the interfacial bonding force between the fibers and the matrix,thus enhancing the macroscopic properties of the materials reinforced with PVA fibers.