Journal of South China University of Technology (Natural Science Edition) ›› 2015, Vol. 43 ›› Issue (2): 127-132,138.doi: 10.3969/j.issn.1000-565X.2015.02.019

• Materials Science & Technology • Previous Articles     Next Articles

Flexural Load-Affected Diffusion rules of Chloride Through Concrete in Splash Zone

Xiong Jian-bo1,2 Su Da-gen1 Li Peng-ping2 Wang Sheng-nian2   

  1. 1． School of Materials Science and Engineering，South China University of Technology，Guangzhou 510640，Guangdong，China;2． Key Laboratory of Harbor ＆ Marine Structure Durability Technology，Ministry of Communications，Guangzhou 510230，Guangdong，China
  • Received:2014-06-06 Revised:2014-09-05 Online:2015-02-25 Published:2014-12-31
  • Contact: 苏达根(1948-)，男，教授，博士生导师，主要从事土木工程材料研究． E-mail:dgsu@scut.edu.cn
  • About author:熊建波(1979-)，男，博士生，高级工程师，主要从事海工高性能混凝土耐久性研究． E-mail: xjianbo@ gzpcc． com
  • Supported by:
    Supported by the National Key Technology Research and Development Program of the Ministry of Science and Technology of China during the "12th Five-Year Plan"(2011BAG07B04)，the Western China Communication Science ＆ Technology Project(201132849A1140)and the Research Fund for the Scientific Research Institute of Ministry of Science and Technology of Chi-na(2013EG124049)

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Abstract: The influence of stress level on the diffusion rules of chloride through maritime high-performance con-crete in splash zone was investigated under constant flexural load，and the load-affected microstructure of the con-crete and the hardened paste was also analyzed by means of SEM-EDS and BET tests． The results show that (1) in the pure bending section，the content of chloride in the concrete at a given depth increases with the increase of the flexural load; (2) for typical maritime high-performance concrete mix，there is approximately an exponential corre-lation between the flexural load and the constant load factor，so that the influence of flexural load on chloride diffu-sion coefficient should be considered in the durability design of concrete structures; (3) the increase in flexural load not only widens the micro-cracks in the interfacial transition zone but also improves the proportion of capillary and macro pores in the hardened paste，and eventually results in the increase of the total pore volume and average pore size，thus decreasing the resistance of concrete to chloride ion penetration．

Key words: flexural load, concrete, chloride, diffusion coefficient, interfacial transition zone, pore structure