**4. Conclusions**

Electrochemical tests were carried out for evaluating the corrosion behavior of rebar (reflecting the durability of RC material) under the effect of crack. The major work of this study includes the recommendation of the reasonable electrochemical test method for rebar in RC material and quantitative analysis of the effect of crack number, width and spacing on rebar corrosion. The following conclusions were drawn:


**Acknowledgments:** The authors express their appreciation for the financial supports of National Natural Science Foundation of China (Nos. 51478203, 51408258).

**Author Contributions:** Yongchun Cheng and Yuwei Zhang designed the experiments and wrote the paper; Yuwei Zhang and Guojin Tan performed the experiments and analyzed the experimental results; Yubo Jiao wrote a part of the paper.

**Conflicts of Interest:** The authors declare no conflict of interest.
