建筑垃圾再生微粉对C30~C40再生混凝土性能的影响  

Effect of recycled micro powder on the performance of C30~C40 recycled concrete

作　　者：虞晓婧 王建刚 王海波 曾波 唐飞 王鸣岐 YU Xiaojing;WANG Jiangang;WANG Haibo;ZENG Bo;TANG Fei;WANG Mingqi(Solid Waste R&D Center,Beijing Urban Green Source Environmental Protection Technology Co.,Ltd.,Beijing 102601,China)

机构地区：[1]北京都市绿源环保科技有限公司固废研发中心,北京102601

出　　处：《混凝土》2024年第4期147-151,156,共6页Concrete

基　　金：国家重点研发计划项目(2020YFC1909904)。

摘　　要：为了评价废混凝土类建筑垃圾再生微粉作为掺合料用于C30、C35、C40强度等级再生混凝土中的可行性,选择建筑垃圾处置厂经收尘得到的再生微粉,以不同比例等量取代粉煤灰制备C30、C35、C40再生混凝土,考察其减水剂用量、抗压强度、抗折强度、动弹性模量、电通量等指标的变化规律。结果表明:掺加再生微粉略微提高减水剂用量,且对再生混凝土的抗压强度、动弹性模量、抗折强度、抗氯离子渗透性有一定的劣化作用,但再生微粉取代率不超过25%时,对抗压强度与抗折强度的劣化作用可控制在5%以内。此外,使用再生微粉取代粉煤灰可降低混凝土材料的综合成本,具有显著的社会经济效益。即再生微粉作为掺合料制备C30、C35、C40强度等级再生混凝土具有可行性。To evaluate the feasibility of using recycled micro powder of construction waste as an admixture in C30,C35,C40 recycled concrete,recycled micro powder obtained from dust collection in construction waste disposal plant was selected to replace fly ash in differ-ent proportions to prepare C30,C35,C40 recycled concrete,and the variation laws of its water reducer dosage,compressive strength,flex-ural strength,dynamic elastic modulus,electric flux and other indicators were investigated.The results show that adding recycled micro powder slightly increases the dosage of water reducing agent and has a certain deterioration effect on the compressive strength,dynamic e-lastic modulus,flexural strength,and chloride ion permeability of recycled concrete.However,when the replacement rate of recycled micro powder does not exceed 25%,the deterioration effect on compressive strength and flexural strength can be controlled within 5%.In addi-tion,replacing fly ash with recycled micro powder can reduce the comprehensive cost of concrete materials,have significant social and e-conomic benefits.It is feasible to use recycled micro powder as an admixture to prepare C30,C35,C40 recycled concrete.

关 键 词：再生微粉 再生混凝土 减水剂用量 力学性能 抗氯离子渗透性能 

分 类 号：TU528.01[建筑科学—建筑技术科学]