Study on the influence of coal gangue and gasification slag on the performance of cement admixture
Coal gangue and gasification slag are byproducts of coal industrial processes,storage and landfill disposal have caused serious pollution and harm to the environment.To facilitate the resource utilization of these solid wastes,based on the analysis of samples such as rapid dissolution evaluation of coal gangue alkali solution ions and activity a-nalysis of gasification coarse slag,various activity evaluation methods such as paste fluidity,compressive strength and flexural strength of mortar specimens,SEM graphic analysis were used to determine the optimal activation tem-perature of coal gangue.The mortar strength test was used to study the influence of coal gangue and gasification slag as cement admixture on the performance of mortar specimens.The results show that the optimum activation tempera-ture of coal gangue is 750 ℃.The activated coal gangue and the mechanically activated gasification coarse slag are mixed with each other,and the P.O 42.5 cement is replaced by 30％.It is concluded that compared with the single incorporation of coal gangue into cement,the synergy of coal gangue and gasification coarse slag as cement admixture can not only improve the mechanical properties of composite cementitious materials,but also plays a good role in en-ergy saving and emission reduction.
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