建筑垃圾再生微粉资源化利用的试验研究OACHSSCD

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.