Abstract: Coal gasification slag is a type of solid waste produced during the coal gasification process. It possesses a certain level of pozzolanic activity and can be used as an auxiliary cementing material. This study investigated the effect of coal gasification slag content on the compressive strength and hydration process of silicate cement, aiming to establish a theoretical basis for the application of coal gasification slag in cementitious materials. The hydration mechanism of the cementitious materials was explored by means of XRD, thermogravimetric (TG) analysis, SEM, and isothermal calorimetry. The results indicated that the incorporation of coal gasification slag significantly reduced the early compressive strength of silicate cement, but had a relatively minor impact on the later strength. The addition of coal gasification slag increased the amount of calcium hydroxide generated per unit mass of cement, thereby accelerating the hydration rate of the cement. The reactivity of the coal gasification slag in the early stage was relatively low, with significant hydration occurring after 7 d. The hydration of coal gasification slag increased the amount of C-S-H gel generated per unit of cement, and reduced the negative impact of coal gasification slag on the strength of cement in the later stage.
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2025, Vol. 39 
