Study on Properties of Water-based Epoxy Emulsion Integrally Modified Calcined Coal Gangue Powder Cement Mortar
In order to improve the ease of mixing calcined gangue powder cement sand,water-based epoxy resin emulsion(CH emulsion)is used to modify the calcined gangue powder cement sand as a whole,and its effect on the flow and mechanical properties of cement sand is studied.The results show that the initial fluidity of cementitious sand doped with 15%CH emulsion is 46%higher than that of the baseline group,and the degree of time loss of CH emulsion doped with 15%is the largest after the same time.Meanwhile,the water absorption of cementitious sand specimens at 28d was reduced by 13%compared with the benchmark group.Strength test also shows that the direct incorporation of CH emulsion has a greater impact on the mechanical properties of cementitious sand,and the compressive and flexural strengths of each group of calcined gangue powder cementitious sand incorporated with CH emulsion are reduced to different degrees compared with that of the benchmark group,and the compressive and flexural strengths of cementitious sand incorporated with 15%of CH emulsion at 7d and 28d are only up to 60%,49%,69%and 78%of that of the benchmark group.The compressive flexural ratio of cementitious sand doped with CH emulsion were all improved compared with the benchmark group,and the larger the dosage,the larger the compressive flexural ratio,i.e.,the doping of CH emulsion can improve the brittleness of cement specimens.
calcined coal gangue powderwater-based epoxy emulsionfluiditymechanical propertiesfolding ratio
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