Computers and Concrete

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Stochastic investigation on three-dimensional diffusion of chloride ions in concrete

  • Ye Tian (Department of Civil Engineering and Architecture, Zhejiang University) ;
  • Yifei Zhu (Department of Civil Engineering and Architecture, Zhejiang University) ;
  • Guoyi Zhang (School of Landscape Architecture, Zhejiang Agriculture and Forestry University) ;
  • Zhonggou Chen (School of Landscape Architecture, Zhejiang Agriculture and Forestry University) ;
  • Huiping Feng (Engineering Design and Research Institute of Rocket Force) ;
  • Nanguo Jin (Department of Civil Engineering and Architecture, Zhejiang University) ;
  • Xianyu Jin (Department of Civil Engineering and Architecture, Zhejiang University) ;
  • Hongxiao Wu (Engineering Design and Research Institute of Rocket Force) ;
  • Yinzhe Shao (Department of Civil Engineering and Architecture, Zhejiang University) ;
  • Yu Liu (Department of Civil Engineering and Architecture, Zhejiang University) ;
  • Dongming Yan (Department of Civil Engineering and Architecture, Zhejiang University) ;
  • Zheng Zhou (China Construction Fifth Engineering Division Corp.,ltd) ;
  • Shenshan Wang (China Construction Fifth Engineering Division Corp.,ltd) ;
  • Zhiqiang Zhang (China Construction Fifth Engineering Division Corp.,ltd)
  • Received : 2023.01.04
  • Accepted : 2023.05.16
  • Published : 2023.09.25
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Abstract

Due to the non-uniform distribution of meso-structure, the diffusion of chloride ions in concrete show the characteristics of characteristics of randomness and fuzziness, which leads to the non-uniform distribution of chloride ions and the non-uniform corrosion of steel rebar in concrete. This phenomenon is supposed as the main reason causing the uncertainty of the bearing capacity deterioration of reinforced concrete structures. In order to analyze and predict the durability of reinforced concrete structures under chloride environment, the random features of chloride ions transport in concrete were studied in this research from in situ meso-structure of concrete. Based on X-ray CT technology, the spatial distribution of coarse aggregates and pores were recognized and extracted from a cylinder concrete specimen. In considering the influence of ITZ, the in situ mesostructure of concrete specimen was reconstructed to conduct a numerical simulation on the diffusion of chloride ions in concrete, which was verified through electronic microprobe technology. Then a stochastic study was performed to investigate the distribution of chloride ions concentration in space and time. The research indicates that the influence of coarse aggregate on chloride ions diffusion is the synthetic action of tortuosity and ITZ effect. The spatial distribution of coarse aggregates and pores is the main reason leading to the non-uniform distribution of chloride ions both in spatial and time scale. The chloride ions concentration under a certain time and the time under a certain concentration both satisfy the Lognormal distribution, which are accepted by Kolmogorov-Smirnov test and Chi-square test. This research provides an efficient method for obtain mass stochastic data from limited but representative samples, which lays a solid foundation for the investigation on the service properties of reinforced concrete structures.

Keywords

Acknowledgement

This research is financially supported b, National Natural Science Foundation of China (Grant No. 52278223), Zhejiang Provincial Natural Science Foundation of China (LGG22E080003), Integrated application of intelligent operation and maintenance technology for Hong Kong-Zhuhai-Macao Bridge (2019YFB1600700), key military projects of rocket force (GXTC-A1-22780035).

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