碳化再生细骨料对再生砂浆与混凝土力学性能的影响  

Effect of Carbonized Recycled Fine Aggregate on Mechanical Properties of Recycled Mortar and Concrete

作　　者：钟传利 苏旭 张亮 孔子航 李海天 朱庆楠 常洪雷 ZHONG Chuanli;SU Xu;ZHANG Liang;KONG Zihang;LI Haitian;ZHU Qingnan;CHANG Honglei(Engineering Construction Center of Yellow River Shandong Bureau,Jinan 250011,China;School of Qilu Transportation,Shandong University,Jinan 250002,China)

机构地区：[1]山东黄河河务局工程建设中心,济南250011 [2]山东大学齐鲁交通学院,济南250002

出　　处：《硅酸盐通报》2025年第4期1468-1476,共9页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金面上项目(52178226);山东省优秀青年基金项目(ZR2023YQ051)。

摘　　要：为提升建筑垃圾再生骨料制备的再生混凝土的力学性能,采用碳化再生细骨料取代原始再生细骨料制备再生砂浆与混凝土,研究碳化再生细骨料对再生砂浆与混凝土力学性能的影响。同时利用X射线衍射仪(XRD)和压汞仪(MIP)对碳化处理再生细骨料和再生砂浆的物相组成和孔结构进行表征。研究发现:碳化处理(7、14、28 d)再生细骨料制备的再生砂浆的抗压强度与抗折强度均明显提升,且与再生细骨料碳化处理的时间呈正相关,28 d强度提升最大(抗压强度提升40.5%,抗折强度提升27.1%);碳化处理(28 d)再生细骨料制备的再生混凝土的抗压强度有所提升(约15.4%)。XRD和MIP结果表明,碳化再生细骨料中的Ca(OH)_(2)等物质转变为CaCO_(3),通过填充孔隙和微裂缝降低基体孔隙率,并改善骨料颗粒形状和表面结构,增强其与水泥基体的结合,优化再生砂浆与混凝土的性能。In order to improve the mechanical properties of recycled concrete prepared from recycled aggregate from construction waste,recycled mortar and concrete were prepared by carbonized recycled fine aggregate instead of original recycled fine aggregate,and the effect of carbonized recycled fine aggregate on the mechanical properties of recycled mortar and concrete was studied.At the same time,X-ray diffraction(XRD)and mercury injection(MIP)were used to characterize the phase composition and pore structure of the recycled fine aggregate and recycled mortar after carbonization.The results show that the compressive strength and flexural strength of the recycled mortar prepared from recycled fine aggregate with carbonization treatment(7,14,28 d)are significantly increased,and the strength is positively correlated with the carbonization treatment time of recycled fine aggregate,and the strength increases the most in 28 d(compressive strength increases by 40.5%and flexural strength increases by 27.1%).The compressive strength of recycled concrete prepared from recycled fine aggregate with carbonization treatment(28 d)is improved(about 15.4%).XRD and MIP results show that Ca(OH)_(2) and other substances in the carbonized recycled fine aggregate are converted into CaCO_(3) after carbonization treatment,which reduces the porosity of the matrix by filling pores and microcracks,improves the shape and surface structure of aggregate particles,enhances its combination with the cement matrix,and optimizes the performance of recycled mortar and concrete.

关 键 词：再生骨料 碳化再生细骨料 再生砂浆 再生混凝土 力学性能 

分 类 号：TU528[建筑科学—建筑技术科学]