Experimental Study on the Resource Utilization of Recycled Micro Powder from Construction Waste
In order to improve the utilization rate and added value of recycled micro powder from construction waste,alkaline excitation,mechanical grinding,and a combination of two excitation methods are used to excite the activity of recycled micro powder,and recycled micro powder is used to replace some cement(with a content of 30%)to prepare rubber sand test blocks,after 28 d of standard curing,the compressive strength test results are used to evaluate the activity excitation effect of recycled micro powder.The results show that Ca(OH)2 and Na2SO3·9H2O are mixed and ball milled in a 1∶1 ratio for 15 min,with an activator content of 2.5%,and the recycled micro powder has the best activity.After 28 d of curing,compared with the control group that uses only ordinary Portland cement as the cementitious material,the compressive strength of the rubber sand test block prepared by using Ca(OH)2+Na2SO3·9H2O as the activator and partially replacing cement with recycled micro powder decreases by only 1.82%,compared with the control group that partially replaces cement with fly ash(with a dosage of 30%),the compressive strength of the former is significantly higher.
construction wasterecycled micro powderresource utilizationcompressive strengthalkali excitationmechanical grinding
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