全废弃混凝土再生水泥的制备研究  

Study on preparation of reclaimed cement from all waste concrete

作　　者：张廷雷 吴健 陈广森 陈正东 ZHANG Tinglei(CREEC Chengdu Engineering Testing Co.LTD.,Chengdu 610083,Sichuan,China)

机构地区：[1]中铁二院成都工程检测有限责任公司,四川成都610083 [2]成都交大工程项目管理有限公司,四川成都610083 [3]四川省第二地质大队,四川成都610041

出　　处：《水泥》2025年第2期6-10,共5页Cement

基　　金：四川省科技服务业示范项目科研课题(2020GFW054)。

摘　　要：不使用任何传统原材料,完全使用废弃混凝土进行生料配比设计,煅烧再生水泥熟料,制备再生水泥。将再生水泥与参比水泥进行了对比试验与分析。结果表明:(1)完全使用废弃混凝土,可以配制出满足水泥熟料率值范围要求的再生水泥生料;(2)XRD分析表明,所制备的三个水泥熟料中,四大矿物C_(3)S、C_(2)S、C_(3)A、C_(4)AF的主要特征峰清晰,特征峰的位置和强度与参比水泥一致,再生水泥熟料的矿物形成正常;(3)再生水泥中,除一组碱含量超标准规定值上限外,其他化学指标、物理力学指标均满足规范要求;(4)再生水泥中,除一组熟料因过烧导致强度偏低外,其余两组的强度均达到42.5级硅酸盐水泥的要求;(5)完全利用多个不同来源的废弃混凝土经处理、配料、煅烧、粉磨后,生产满足要求的再生水泥是可行的。This study explored the design of raw material proportions without traditional raw materials,and its waste concrete in raw meal higher up to 100%by weight.Recycled cement was prepared by calcining reclaimed cement clinker from waste concrete.Experiments and analysis were employed to compare recycled cement with reference cement.The results show that recycled cement raw material that meets the requirement of cement clinker rate range can be prepared by using waste concrete completely.The XRD analysis shows that the main characteristic peaks of four minerals C_(3)S,C_(2)S,C_(3)A and C_(4)AF in the three prepared cement clinker are clear,the position and strength of the characteristic peaks are consistent with that of the reference cement,and the mineral formation of reclaimed cement clinker is normal.In reclaimed cement,except for a group of alkali content exceeds the upper limit of the standard value,other chemical indexes,physical and mechanical indexes meet the specification requirements.In the reclaimed cement,except for one group of clinker whose strength is low due to overburning,the strength of the other two groups both reach the requirements of 42.5 grade Portland cement.It is feasible to produce reclaimed cement by treating,batching,calcination and grinding waste concrete from different sources.

关 键 词：废弃混凝土 再生水泥 水泥熟料 生料配比 矿物组成 

分 类 号：TQ172.4[化学工程—水泥工业] X781.5[化学工程—硅酸盐工业]