Macro and Micro Properties Analysis of Mixed Fiber Coal Gangue Concrete

ObjectiveTo improve the mechanical properties of coal gangue concrete, Method this article designed a four-level and four-factor orthogonal test with coal gangue ceramide substitution rate, coal gangue ceramside sand substitution rate, steel fiber content, and polypropylene fiber content as independent variables. ResultThrough multi-dimensional data analysis of the test results, the primary and secondary factors and the optimal content of compressive strength of hybrid fiber coal gangue concrete were obtained. The grey prediction model GM (1,5) was obtained. The effect of fiber and coal gangue on the microstructure was studied by scanning electron microscopy, and the effect of the interfacial transition zone on the strength of concrete was investigated. ConclusionThis research provided a theoretical basis for the application of coal gangue concrete in engineering.