## 4 Conclusions  
The aim of this study is to investigate the concrete corrosion cracking and transverse bar strain behavior in a reinforced concrete column under simulated marine conditions. Based on the results, the following conclusions can be drawn:  
1. This study performed accelerated corrosion tests on RC column specimens with transverse and longitudinal rebar and under marine-like conditions. The specimens were set-up so that current flowed through the longitudinal and transverse bar independently, and the current application time was controlled to create an environment with an uneven chloride ion distribution representative of in-situ RC columns.  
Figure 11: Relationship between the calibrated corrosion amount and transverse bar strain.  
2. The rebar was removed from the RC column specimens after the accelerated corrosion tests and the rebar weights were measured. The extent of longitudinal bar corrosion varied according to the direction of chloride ions permeation, and the corner rebar corroded 1.5 times more than the centrally embedded rebar. Macro cells also formed due to the uneven chloride distribution, and more transverse bar corrosion occurred than longitudinal bar corrosion.
3. Cracks occurred first in the concrete around the transverse bar in the RC specimens with a low concrete compressive strength and thin cover. It was confirmed that concrete corrosion cracking and rebar strain are greatly affected by the behavior of rebar corrosion by-products and their interaction with pores in the cement paste.
4. In RC column specimens with high-dimeter longitudinal rebars or thick concrete cover, the inability of corrosion products to flow out resulted in a sharp increase in transverse bar strain, even with relatively low amounts of corrosion. Therefore, it is necessary to be cautious of reduced durability resulting from the accumulation of chlorides in RC columns that have rebar with large longitudinal bar diameters or thick concrete covers.
5. The weight reduction of rebar after the accelerated corrosion experiments was determined and a calibrated corrosion amount was calculated, assuming that this was proportional to the ampere-hours. However, under field conditions, rebar corrosion may vary due to environmental conditions, including chloride ion concentrations, oxygen supply, and humidity. Therefore, further experiments are needed to examine the progression of rebar corrosion and to evaluate the effect of rebar corrosion on concrete cover cracking behavior.  
Conceptualization, G.C., G.K., S.L., E.L., Y.S. and J.N.; methodology, S.Y.; validation, G.C., G.K., Y.S. and J.N.; formal analysis, S.L., Y.S. and G.K.; investigation, E.L., Y.S. and J.N.; resources, Y.S.; data curation, G.C.; writing--original draft preparation, G.C., Y.S. and J.N.; writing--review and editing, G.C. and J.N.; visualization, G.C. and J.N.; supervision, J.N.; project administration, J.N.; funding acquisition, J.N. All authors have read and agreed to the published version of the manuscript.  
This research was supported by a Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education [grant 2017R1D1A1B03034776].  
The authors declare no conflict of interest.