建筑垃圾再生微粉对水泥净浆性能的影响  

Effect of Recycled Powder Produced by Construction Waste on Cement Paste Performance

作　　者：王炳雷[1,2] 吕泊宁 姚坤宇 颜士荣 WANG Bing-lei;LÜBo-ning;YAO Kun-yu;YAN Shi-rong(School of Civil Engineering,Shandong University,Jinan 250061,China;Taian(Shandong University)Urban and Rural Solid Waste Comprehensive Utilization Research Institute,Taian 271000,China)

机构地区：[1]山东大学土建与水利学院,济南250061 [2]泰安(山东大学)城乡固废综合利用研究院,泰安271000

出　　处：《科学技术与工程》2022年第33期14861-14869,共9页Science Technology and Engineering

基　　金：山东省自然科学基金(ZR2021MA011);山东省重点研发计划(2019GSF109022)。

摘　　要：利用废弃混凝土生产的再生微粉可以一定程度取代水泥材料,在工程中具有十分巨大的应用潜力。为了更好地研究其相关工作性能和力学性能,研究了普通再生微粉和700℃低温煅烧再生微粉对水泥净浆不同取代率下的工作性能、抗折与抗压强度和强度活性指数的影响,拟合出两种再生微粉取代率与类折压比的函数关系表达式,并进行了再生微粉对水泥净浆微观结构特征影响分析。结果表明:随着取代率增加,水泥净浆的工作性能如流动度减小,标准稠度用水量和凝结时间增加;力学性能如抗折强度、抗压强度与强度活性指数均减小,再生微粉取代率超过30%时对抗压强度影响较大。700℃低温煅烧处理再生微粉取代水泥净浆力学性能优于普通再生微粉取代水泥净浆力学性能。The recycled powder(RP) produced in the recycling process of waste concrete is used as an alternative of cementing material, which has a huge application potential. Different replacement rates were designed to evaluate working performance, flexural strength, compressive strength and strength activity index of the ordinary recycled powder(RPⅠ) and 700℃ calcined recycled powder(RPⅡ) cement paste. The function of RP replace rates and flexural compression rate were fitted. The microscopic tests were conducted to investigate the effect of RP on microstructure characteristics of cement paste. It is concluded that the fluidity of cement paste decreases, water consumption of standard consistency and setting time increase, the compressive strength and flexural strength decrease with the increase of the substitution rate. When the substitution rate exceeds 30%, the compressive strength is greatly influenced, the mechanical properties of cement paste mixed with RPⅡ is better than RPⅠ.

关 键 词：再生微粉 水泥净浆 低温煅烧 工作性能 力学性能 

分 类 号：TU502[建筑科学—建筑技术科学]