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Journal of Chinese Society for Corrosion and protection  2018, Vol. 38 Issue (4): 309-316    DOI: 10.11902/1005.4537.2017.139
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Effect of Crack Characteristics on Chloride Transport in Concrete: An Overview
Xuekai TIAN1,2, Hailong WANG2(), Xudong CHENG1(), Xiaoyan SUN2
1 College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China
2 College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
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Abstract  

Chloride ingression is a major cause of the durability deterioration of reinforced concrete structures in marine environments or exposed to deicing salt. The inevitable cracks in real structure have a significant influence on the transport of chloride ions. The present available methods for artificially inducing concrete cracks in concrete structural parts were introduced, while the relevant advantages and disadvantages of these methods were demonstrated in this paper. On basis of the overview of experimental studies on the chloride ion diffusion in cracked concrete, the geometrical parameters of concrete cracks and their influence on chloride penetration were analyzed, the theory and numerical models of chloride ion transport in cracked concrete were summarized, and some recommendations for further research were given.
Key words:  concrete      crack geometrical parameter      chloride transport     
Received:  23 August 2017     
ZTFLH:  TU528.1  
Fund: Supported by National Natural Science Foundation of China (51579220 and 51378456) and Natural Science Foundation of Zhejiang Province (LY16E080004)
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Articles by authors
Xuekai TIAN
Hailong WANG
Xudong CHENG
Xiaoyan SUN

Cite this article: 

Xuekai TIAN, Hailong WANG, Xudong CHENG, Xiaoyan SUN. Effect of Crack Characteristics on Chloride Transport in Concrete: An Overview. Journal of Chinese Society for Corrosion and protection, 2018, 38(4): 309-316.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.139     OR     https://www.jcscp.org/EN/Y2018/V38/I4/309

Fig.1  Illustrations of four mechanics destructive methods: (a) splitting method[19], (b) three or four points bending[21], (c) expansive core method[27], (d) wedge splitting method[28]
Method for inducing cracks Method for Cl- transport testing w1 / μm w2 / μm Reference
Splitting method RCPT 200 --- [4]
Expansive core method Diffusion cell 50/30 200 [26,27]
Splitting method Steady migration test 30 80 [17]
Wedge splitting method Non-steady migration test / Diffusion cell 12/50 --- [33]
Flat-restraint shrinkage crack Diffusion cell 100 --- [9]
Splitting method Steady migration test --- 80 [19]
Notch method Non-steady migration test 50 100 [34]
Axial compression test Non-steady migration test 100 400 [35]
Table 1  Influence of crack width on the transport of Cl- in cracked concrete
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