Research has shown that mixing stone powder with silica fume,fly ash,and other materials in a certain proportion to replace cement has the advantage of improving the mechanical and durability properties of concrete.This article uses granite powder,slag,and fly ash to prepare a highly active ultrafine composite admixture using cement clinker and desulfurization gypsum as activators,and studies the effect of grinding time on the performance of the ad-mixture.The experimental results show that considering the activity and economy of the admixture,it is better to use granite powder∶slag∶fly ash=30∶15∶55 as the admixture,and 8%clinker and 3%desulfurization gypsum as the activator.
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