Study on the Properties of Composite Admixture for Concrete Prepared by Partially Substituting Coal Gangue for Fly Ash
The composite mineral admixtures for concrete were prepared by partially replacing fly ash with coal gangue powder.The effects of coal gangue powder,fly ash and phosphorus slag on the flexural strength,compressive strength,activity index and strength growth ratio of the tested mortar were studied through orthogonal experiments.The results showed that there was a strong interaction between gangue powder,fly ash and phosphorus residue on the hydration of cement,and when the design mix ratio is appropriate,the 7-day and 28-day activity index and strength growth ratio of the tested gum sand reached the requirements of the ordinary grade Ⅲ composite mineral admixture of composite admixture for concrete,indicating that it was completely feasible to prepare composite mineral admixture for concrete by replacing fly ash with gangue powder,and the optimal scheme is to add 25.0% coal gangue powder,62.5% fly ash,and 12.5% phosphorus slag.
NETL
NSTL
万方数据
