INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Study on the Correlation Between Chloride Ion Transportation and pH Distribution in Unsaturated Mortar |
YANG Lin1, ZHANG Yunsheng2, ANDRADE Carmen3, ZHANG Chunxiao4
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1 School of Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, China 2 School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China 3 International Center for Numerical Methods in Engineering, CIMNE, Spain 4 Institute of Engineering Protection, Institute of Defense Engineering, Academy of Military Science of PLA, Luoyang 471023, China |
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Abstract Chloride ion transportation and pH distribution of unsaturated mortar suffered from continuous immersion in chloride solution and drying-wetting cycles were investigated, and the influence of carbonation on chloride transportation was considered. What's more, the correlation between chloride transportation and pH distribution was analyzed systematically. The results show that the chloride transportation and pH distribution do not show a direct correlation when the dried mortars were suffered from continuous immersing in NaCl solution for different time. However, under the drying-wetting cycles, the chloride transportation of unsaturated mortar is closely related to pH distribution. The decrease of chloride content near the surface of mortar is consistent with the decrease of pH. For the unsaturated pre-carbonated mortar suffered from drying-wetting cycles, the chloride content distribution and pH distribution show the same characteristics, similar to “S” shape. The carbonation of unsaturated mortar changes the pH distribution and further affects the behavior of chloride transportation.
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Published: 30 September 2021
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Fund:This work was financially supported by the National Natural Science Foundation of China (51808508, 52078468). |
About author:: Lin Yang received his doctor degree in 2017 from Southeast University. He works in the School of Water Conservancy Engineering, Zhengzhou University, as an associate professor. His research area is the durability of cement-based materials. |
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