预处理方式对再生砂及其胶砂性能的影响  

Effect of pretreatment methods on the performance of recycled sand and its cement mortar

作　　者：程欢 何政 刘金坤 孙德易 李晓龙 CHENG Huan;HE Zheng;LIU Jinkun;SUN Deyi;LI Xiaolong(China Railway Engineering Design and Consulting Group Co.,Ltd.,Beijing 100055,China;China Railway Consulting Group Beijing Engineering Testing Co.,Ltd.,Beijing 100073,China;Chongqing-Wanzhou Railway Co.,Ltd.,Chongqing 400037,China)

机构地区：[1]中铁工程设计咨询集团有限公司,北京100055 [2]中铁咨询集团北京工程检测有限公司,北京100073 [3]渝万铁路有限责任公司,重庆400037

出　　处：《混凝土与水泥制品》2025年第2期101-106,共6页China Concrete and Cement Products

摘　　要：研究了预处理方式(颗粒整形、水泥浆浸泡、碳化处理)对再生砂压碎指标、孔结构及胶砂需水量、力学性能、吸水性、干燥收缩性能和孔结构的影响。结果表明:颗粒整形对再生砂抗压碎性能和孔结构的改善效果最好;相比于掺未处理再生砂的胶砂,掺颗粒整形再生砂胶砂的需水量降低了23.86%,28 d抗压强度、抗折强度分别提高了77.97%、50.00%,吸水量降低了1.55%,干燥收缩值降低了6.46%,孔隙率降低了58.52%。The effects of pretreatment methods(particle shaping,cement slurry soaking and carbonation treatment)on the crushing index,pore structure of recycled sand,as well as the water demand,mechanical properties,water absorption,drying shrinkage performance and pore structure of cement mortar were investigated.The results show that particle shaping has relatively the best effect on the improvement of crushing resistance and pore structure of recycled sand.Compared with the cement mortar with untreated recycled sand,the water demand of the cement mortar with recycled sand after particle shaping decreases by 23.86%,the 28 d compressive strength and flexural strength increase by 77.97%and 50.00%,respectively,the water absorption decreases by 1.55%,the drying shrinkage value decreases by 6.46%,and the porosity decreases by 58.52%.

关 键 词：废弃轨枕 再生砂 碳化 颗粒整形 水泥浆浸泡 胶砂性能 

分 类 号：TU528.0[建筑科学—建筑技术科学]