| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Quantitative Relationships Between Oxide Contents of Cementitious Materials and Chloride Ion Binding Amount |
| GUO Liping1,2,†, XUE Xiaoli1,†, CAO Yuanzhang1, FEI Xiangpeng1, DING Cong1
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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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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.
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Published: 28 January 2021
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| Fund:National Natural Science Foundation of China (51778133), the China Ministry of Science and Technology (973 Program, 2015CB655102). |
About author:: Liping Guo, Ph. D., Full Professor, Ph.D. supervisor. Research interests: Ecological high ductility cementitious composites, durability of concrete, self-cleaning inorganic coating made by recycled waste so-lids.She presides over three NSFC projects and two sub-topic researches of the National Key R & D Project (973 Plan).
Xiaoli Xue, a graduate student of Southeast University, is mainly engaged in the research of concrete durability and participated in the research of the National 973 Project “Basic Research on Long Life of Concrete Materials and Structures in Harsh Environments” (project number: 2015CB655102). |
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2021, Vol. 35 
