- 陈 曦，李 滢，庄平英
引用本文摘 要： 研究了实验室破碎废弃混凝土过程中产生的再生微粉的性能，并将再生微粉以不同比例掺入水泥净浆、砂浆及混凝土中，研究其影响规律。结果表明，再生微粉具有潜在活性，可以替代水泥胶凝材料；随着再生微粉取代率的增加，水泥净浆标准稠度用水量增加、凝结时间延迟，水泥胶砂流动度减小；当再生微粉取代率大于20%时，砂浆强度降低明显；当再生微粉取代率为20%时，混凝土各龄期强度均为最高，其28 d抗压强度达到48.16 MPa；随着水化龄期的增加，各取代率下的强度比差异越来越小，再生微粉混凝土后期强度增长较快。 Abstract: The properties of the recycled fine powder(RFP) produced in the process of crushing waste concrete in the laboratory were studied, and the RFP was mixed into cement paste, mortar and concrete in different proportions to investigate its influencement. The results show that the RFP has potential activity and can replace cementitious materials. With the increase of the replacement rate of RFP, the water consumption of cement paste standard consistency increases and the setting time of cement paste is delayed, and the fluidity of cement mortar decreases. The strength of mortar decreases when the replacement rate of RFP exceeds 20%. When the replacement rate of RFP is 20%, the strength of concrete at each age is the highest, and the 28 d compressive strength of concrete reaches 48.16 MPa. With the increase of hydration age, the strength ratio under each substitution rate is getting smaller and smaller, and the strength of concrete at late age grows faster.
陈曦,李滢,庄平英.废弃混凝土再生微粉胶凝性能的试验研究[J].混凝土与水泥制品,2019(11):96-100. CHEN X,LI Y,ZHUANG P Y.Experimental Study on Cementitious Properties of Recycled Fine Powder from Waste Concrete[J].China Concrete and Cement Products,2019(11):96-100.