Recycled micro-powder has potential activity and can be used as an auxiliary cementitious material to replace ce-ment,but its application is limited by its low activity.Therefore,in this paper,the activity index,mechanical properties and micro-morphology of the regenerated fine powder were studied by physical-chemical method.The results showed that with the increase of grinding time,the compressive and flexural strength of mortar increased at first and then decreased;when the grinding time was 4 h,the 28 d compressive strength was 28.6 MPa,the activity index was 64.3％.When using physical-chemical composite activation,when grinding for 4h and adding 1％Na2SO4+1％Ca(OH)2 activator,the 28 d compressive strength of the mortar test block was 35.2 MPa,the activity index was 79.1％,thus significantly improving the activity of the recycled fine powder.
维普
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