- 陳 曦，李 瀅，莊平英
引用本文摘 要： 研究了實驗室破碎廢棄混凝土過程中產生的再生微粉的性能，并將再生微粉以不同比例摻入水泥凈漿、砂漿及混凝土中，研究其影響規律。結果表明，再生微粉具有潛在活性，可以替代水泥膠凝材料；隨著再生微粉取代率的增加，水泥凈漿標準稠度用水量增加、凝結時間延遲，水泥膠砂流動度減??；當再生微粉取代率大于20%時，砂漿強度降低明顯；當再生微粉取代率為20%時，混凝土各齡期強度均為最高，其28 d抗壓強度達到48.16 MPa；隨著水化齡期的增加，各取代率下的強度比差異越來越小，再生微粉混凝土后期強度增長較快。 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.
陳曦,李瀅,莊平英.廢棄混凝土再生微粉膠凝性能的試驗研究[J].混凝土與水泥制品,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.