In order to investigate the high-temperature performance of graphene oxide modified concrete and the effect of different cooling methods on concrete performance,FIB-SEM microscopic observation was performed on the benchmark group and the test group with 0.05％graphene oxide.The effects of natural cooling,immersion cooling,and spraying cooling at different high-temperature nodes on the concrete mass loss rate,mechanical characteristics of the samples,and uniaxial compressive stress-strain constitutive equation were studied.The results show that the peak stress and mod-ulus of elasticity of the benchmark group and graphene group are gradually decreasing with the increase of heat treatment temperature,and the mass loss rate and peak strain are gradually increasing,but the graphene oxide improves the me-chanical properties and high temperature resistance of concrete by refining the pore size and adjusting the microstructure of cement hydration products,and thus showing better mechanical properties.Different cooling methods have different effects on the mechanical properties,which are positively correlated with the cooling rate,i.e.,immersion cooling＞spraying cooling＞natural cooling,and the uniaxial compressive stress-strain relationship can be described by the seg-mental equation.
关键词
混凝土/氧化石墨烯/高温冷却/物理力学性能/微观结构
Key words
concrete/graphene oxide/high temperature cooling/physico-mechanical properties/microstructure
维普
万方数据