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Comparative study on corrosion behavior of plain and deformed bars in concrete

ZHANG Jian-ren,YUE Jian-bin(College of Bridge and Structure Engineering,Changsha University of Science and Technology,Changsha 410076,China)  
Reinforced concrete beams with different bar diameters are produced in the laboratory.Corrosion ratio of the bars is achieved by impressing current to them.96 reinforced bar samples with various corrosion levels are obtained,including 48 HPB235 plain round bars and 48 deformed bars.The rust was removed by using acid and alkali,respectively.The mechanical properties of the samples are tested.The relationships between the mechanical properties and the weight loss ratio for two kinds of bars are established respectively.The research indicates that the corrosion characters are different for different types of bar.Combining with the experimental data of existing literatures,the degradation regression equations of the mechanical properties for corrosion plain round bars and deformed bars are further established separately.
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