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A new type of compound mineral admixture was prepared by using CFBC fly ash and slag power.The hydration of compound mineral admixture was researched by means of X-ray diffraction(XRD),alkalinity of pore solution,differential thermal analysis and hydration heat analysis,and the effect of fineness30,chemical composition and contents of CFBC fly ash on activity index,mortar fluidity and the compatibility of cement and admixture of compound mineral admixture was also investigated.