Effect of heat-activated coal gangue on the properties of cement-based materials
Thermal activated coal gangue as an auxiliary cementing material to replace part of cement to prepare cement mortar,systematically studies the effects of different amounts of thermal activated coal gangue on the compressive strength and flexural strength of cement mortar,and the mechanism of thermal activation of coal gangue to enhance the mechanical strength of cement-based materials was explored.The results show that in the process of using thermally activated coal gangue to replace part of cement to pre-pare mortar,proper amount of thermally activated coal gangue has good pozzolanic effect and micro aggregate effect,which can promote the formation of cross-linked network C—S—H gel in mortar matrix,enhance the filling effect of pores in mortar matrix,improve the microstructure of mortar matrix,and then achieve the purpose of improving the mechanical strength of cement-based materials.When the amount of thermal activated coal gangue is 20％,the compressive strength and flexural strength of the mortar sample for 28 d after hydration can reach 46.2 MPa and 6.79 MPa,and the mechanical strength is equivalent to that of pure cement mortar,which can fully meet the requirements of the general construction industry.
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