基于煤气化细渣的辅助胶凝材料对砂浆性能影响及水化行为研究OA

[Purposes]Coal gasification fine slag is a solid waste formed during the coal gasifica-tion process.[Methods]To improve its utilization rate,in this research,the substitution of part of ce-ment with coal gasification fine slag was conducted.The setting time of paste,workability,and me-chanical properties of the mortar were investigated.Besides,the hydration mechanism of the coal gas-ification fine slag-cement composite was analyzed by using isothermal calorimetry,XRD,scanning electron microscopy,and thermodynamic simulation.[Results]The results indicate that as the content of coal gasification fine slag increasing,the setting time of pure cement paste is prolonged,and the workability of the mortar gradually decreases.When the coal gasification fine slag content is 10%,the 28 d compressive strength of the mortar reaches the level of the control group.Adding an appropriate amount(not exceeding 10%)of coal gasification fine slag into cement-based materials reduces heat of hydration of cement,decreases cement consumption,and improves the utilization rate of coal gasifica-tion fine slag without significantly affecting the performance indicators of cement-based materials.