Mechanical Properties and Microstructure of Mechanical Sand Concrete at High Temperature based on Electron Microscopy

Abstract

For sustainable development, sand-mixed concrete has been paid more and more attention by researchers. In order to study the mechanical properties of sand-gravel concrete, five temperature levels of natural cooling and water cooling were considered, and the mechanical properties of sand-stone concrete after high temperature were tested.. In order to study the mechanical properties of desert sand concrete after high temperature, this paper designs a single factor test with the replacement rate of desert sand as the variable. Five temperature levels are considered, and natural cooling and watering cooling are adopted to test the mechanical properties of desert sand concrete after high temperature. The influences of temperature, desert sand replacement rate, cooling method and fly ash content on compressive strength, axial compressive strength and static compressive elastic modulus of desert sand concrete after high temperature were analyzed, and the deterioration model of strength and elastic modulus of desert sand concrete after high temperature was established. From high temperature post-voltage voltage specimen sampling, X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM) observation, from the micro level desert sand concrete after high temperature macro performance deterioration mechanism to explain.