矿渣及水泥物化特性对混凝土抗氯盐侵蚀的影响  

Effect of physical and chemical properties of slag/cement on the resistance of concrete to chloride salt attack

作　　者：喻奇洋 张力 YU Qiyang;ZHANG Li(Sichuan Transportation Construction Group Co.,Ltd.,Chengdu 610047,China)

机构地区：[1]四川省交通建设集团有限责任公司,四川成都610047

出　　处：《交通科学与工程》2024年第5期70-79,86,共11页Journal of Transport Science and Engineering

基　　金：成都市技术创新研发项目(2021-YF05-01173-SN)。

摘　　要：为探究矿渣混凝土中的化学成分对其抗氯离子侵蚀性能的影响,采用矿物成分各不相同的2种矿渣(A和B)以及4种水泥(W、X、Y及Z)为原材料,固定60%矿渣替代率制备了矿渣混凝土试样。通过X射线衍射分析、热力学建模、压汞法测试研究不同水泥-矿渣组合下混凝土中Cl^(-)的吸附和扩散特性。试验结果表明:添加矿渣可提高混凝土中Cl^(-)的吸附能力,降低Cl^(-)的扩散率。相较于铝含量较低的矿渣混凝土,铝含量较高的矿渣混凝土的Cl^(-)吸附能力更强;用水泥W制备的混凝土的Cl^(-)吸附能力最强,而用水泥Z制备的混凝土的Cl^(-)吸附能力最弱;C3A、C3S对Cl^(-)的吸附能力影响显著;较高的pH值会降低Cl^(-)的吸附能力;碳铝酸盐的形成、石灰石的填充作用及孔隙孔径的缩小均会降低Cl^(-)的渗透率。To investigate the influence of chemical components in slag concrete on its resistance to chloride ion attack,this study took two types of slags(A and B)with different mineral components and four types of cements(W,X,Y,and Z)as raw materials to prepare slag concrete samples with a fixed slag replacement rate of 60%.The adsorption and diffusion characteristics of Cl^(-)in the concrete under different cement-slag combinations were studied through X-ray diffraction analysis,thermodynamic modeling,and mercury intrusion porosimetry tests.The experimental results indicate that adding slag can enhance the Cl^(-)adsorption capacity of concrete and reduce the diffusion rate of Cl^(-).Compared to slag concrete with lower aluminum content,slag concrete with higher aluminum content exhibits stronger Cl^(-)adsorption capacity.The concrete prepared with cement W has the strongest Cl^(-)adsorption capacity,while that prepared with cement Z has the weakest Cl^(-)adsorption capacity.C3A and C3S significantly influence the Cl^(-)adsorption capacity.Higher pH decreases the Cl^(-)adsorption capacity.The formation of carboaluminates,the filling effect of limestone,and the reduction in pore size all contribute to lowering the permeability of Cl^(-).

关 键 词：桥梁工程 矿渣混凝土 物化特性 抗氯离子侵蚀 氯离子吸附 

分 类 号：U444[建筑科学—桥梁与隧道工程]