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材料导报  2021, Vol. 35 Issue (2): 2039-2045    https://doi.org/10.11896/cldb.19110229
  无机非金属及其复合材料 |
水泥基胶凝材料氧化物含量与氯离子结合量的定量关系
郭丽萍1,2,†, 薛晓丽1,†, 曹园章1, 费香鹏1, 丁聪1
1 东南大学材料科学与工程学院,南京 211189;
2 江苏省土木工程材料重点实验室,江苏省先进土木工程材料协同创新中心,南京 211189
Quantitative Relationships Between Oxide Contents of Cementitious Materials and Chloride Ion Binding Amount
GUO Liping1,2,†, XUE Xiaoli1,†, CAO Yuanzhang1, FEI Xiangpeng1, DING Cong1
1 School of Materials Science and Engineering, Southeast University, Nanjing 211189, China;
2 Collaborative Innovation Center for Sustainable Civil Engineering Materials & Structures, Jiangsu Key Laboratory of Construction Materials, Nanjing 211189, China
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摘要 为揭示氯盐溶液及存在硫酸盐复合盐溶液中氯离子对水泥基材料的侵蚀特性,合理选用氯盐环境下水泥基材料组分,减小海洋环境和盐湖卤水对混凝土造成的氯离子侵蚀问题,本工作通过添加矿物掺合料(矿渣和粉煤灰)改变主要氧化物含量,研究水泥基材料氧化物含量与氯离子结合量的关系。采用等温吸附法测试样品的氯离子结合量,采用X射线衍射仪(XRD)和同步热分析仪(TG-DSC)表征侵蚀产物。实验结果表明,在氯盐溶液侵蚀下,水泥基材料的氯离子结合量与其Al2O3、SiO2含量成正比,与CaO含量成反比。在硫酸盐存在的复合盐溶液侵蚀下,硫酸盐浓度较低(3.5% NaCl+0.5% Na2SO4)时,氯离子结合量略有下降,测试结果表明Friedel盐的生成量不会因硫酸根离子的引入而降低,此时两种离子没有明显的竞争关系;当硫酸盐浓度提高到5% Na2SO4时,氯离子结合量下降显著,实验结果表明Friedel盐的生成量降低,两种离子间竞争关系显著,但不影响氧化物含量与氯离子结合量之间的相关性。
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郭丽萍
薛晓丽
曹园章
费香鹏
丁聪
关键词:  氧化物含量  氯离子  硫酸根离子  水泥基材料    
Abstract: In order to reveal the corrosion characteristics and mechanism of cementitious materials in the chloride salt solution and presence of sulfate composite salt solution, meanwhile select the cementitious material components rationally in the chloride salt environment, to reduce the chloride erosion caused by the chloride salt. In this paper, the main oxide contents were changed by adding mineral admixtures (slag and fly ash) to study the relationship between the oxide contents of cementitious materials and the chloride ion binding amount. The chloride ion binding amount was tested by plasma adsorption method. X-ray diffractometer (XRD) and synchronous thermal analyzer (TG-DSC) were used to characterize the corrosion products. The experimental results show that, the chloride ion binding amount of cementitious materials is proportional to the content of Al2O3 and SiO2 under the corrosion of chloride salt solution, which is inversely related to the CaO content. Under the attack of complex salt solution, when the sulfate concentration is lower (3.5% NaCl+ 0.5% Na2SO4), there is no obvious competition between the two, the amount of Friedel’s salt is not reduced by the introduction of sulfate ions; when the sulfate concentration is increased to 5% Na2SO4, the competition between the two is significant, but does not affect the correlation between oxide contents and chloride ion binding amount.
Key words:  oxide content    chloride ion    sulfate ion    cementitious materials
               出版日期:  2021-01-25      发布日期:  2021-01-28
ZTFLH:  TU528  
基金资助: 国家自然科学基金面上项目(51778133) ;国家重点研发计划资助项目(973计划)(2015CB655102)
通讯作者:  guoliping691@163.com   
作者简介:  郭丽萍,博士,教授,博导。主要研究方向为生态型高延性水泥基复合材料、混凝土耐久性、固废物再生自清洁无机涂层。主持在研和完成国家自然科学基金面上项目2项、青年基金1项,主持完成国家重点研发计划资助项目(973计划)子题2项等。
薛晓丽,东南大学硕士研究生,主要从事混凝土耐久性的研究,参与国家973项目“严酷环境下混凝土材料与结构长寿命的基础研究”(项目编号:2015CB655102)。
引用本文:    
郭丽萍, 薛晓丽, 曹园章, 费香鹏, 丁聪. 水泥基胶凝材料氧化物含量与氯离子结合量的定量关系[J]. 材料导报, 2021, 35(2): 2039-2045.
GUO Liping, XUE Xiaoli, CAO Yuanzhang, FEI Xiangpeng, DING Cong. Quantitative Relationships Between Oxide Contents of Cementitious Materials and Chloride Ion Binding Amount. Materials Reports, 2021, 35(2): 2039-2045.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.19110229  或          http://www.mater-rep.com/CN/Y2021/V35/I2/2039
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