【作者】 卫宇航； 曹忠露； 侯晋芳； 李斌； 贾冠元； 陈庞； 刘平；

【Author】 Yuhang Wei;Zhonglu Cao;Jinfang Hou;Bin Li;Guanyuan Jia;Pang Chen;Ping Liu;CCCC Tianjin Port Engineering Institute Co., Ltd.;CCCC First Harbor Engineering Company Ltd.;School of Civil and Transportation Engineering, Hebei University of Technology;

【机构】 中交天津港湾工程研究院有限公司； 中交第一航务工程局有限公司； 河北工业大学土木与交通工程学院；

【摘要】 本文研究了不同矿物掺合料对硫铝酸盐水泥混凝土(SAC)氯离子结合性能的影响。分析了氯离子浓度、养护龄期、矿物掺合料种类和掺量对SAC氯离子结合率的影响。结果发现,随着养护龄期的增加,SAC中水溶性氯离子含量降低,而氯离子结合比相应增加,表明其抗内部氯离子渗透能力增强。粉煤灰(FA)和磨粒高炉渣(GGBS)的加入可显著提高SAC的氯离子结合能力,当FA添加量为20%时,氯离子结合率提高到46.6%,当GGBS添加量为40%时,氯离子结合率提高到38.7%。采用x射线衍射(XRD)分析了矿物掺杂剂对SAC微观结构和物相组成的影响。结果表明,FA和GGBS的加入促进了C-S-H(水合硅酸钙)凝胶的形成,提高了SAC对氯离子渗透的抵抗力。另一方面,硅灰(SF)的过量添加导致氯离子结合能力下降,而适量的石灰石粉(LP)提高了氯离子结合能力。更多还原

【Abstract】 In this study, the chloride ion binding ability of sulfoaluminate cement concrete(SAC) containing different mineral admixtures was investigated. The effects of chloride concentration, curing age, and the type and amount of mineral admixture on the chloride binding rate of SAC were analyzed. It was found that the content of water-soluble chloride ions in SAC decreased with the increase of curing age, while the chloride binding ratio increased accordingly, indicating that its resistance to internal chloride permeation increased. The addition of fly ash(FA) and ground granulated blast furnace slag(GGBS) can significantly improve the chloride binding capacity of SAC, and the chloride binding rate increases to 46.6% with 20% of FA and 38.7% with 40% of GGBS. The effects of mineral dopants on the microstructure and phase composition of SAC were further investigated by X-ray diffraction(XRD) analysis. The results showed that the addition of FA and GGBS promoted the formation of C-SH(calcium silicate hydrate) gels and improved the resistance of SAC to chloride ion penetration. On the other hand,the excessive addition of silica fume(SF) led to a decrease in the chloride binding capacity, whereas a moderate amount of limestone powder(LP) improved the chloride binding capacity.更多还原