An experimental investigation on the reinforcing bar corrosion and relationship of reinforcing bar and concrete bond strength has been conducted to establish the allowable limit of rust in the construction field. The reinforcing bars used in this stud...
An experimental investigation on the reinforcing bar corrosion and relationship of reinforcing bar and concrete bond strength has been conducted to establish the allowable limit of rust in the construction field. The reinforcing bars used in this study were rusted before embedding in concrete. The first component of this experiment is to make reinforcing bar rust electrically based on Faraday's theory at certain rates such as 2, 4, 6, 8 and 10% of reinforcing bar weight. To estimation of the amount of rust by weight, Clarke's solution and shot blasting were adopted and compared. Parameters include 240 and 450㎏/㎠ of compressive strengths and diameter of reinforcing bar(16, 19 and 25㎜) corresponding development length for pull-out test. It is found from the test results that the test techniques for corrosion of bar used in this study is relatively effective and correct test method. Results shows that up to 2% of rust increases the bond strength regardless of concrete strength and diameter of reinforcing bar like the existing data. It might be because of the roughness due to rust. As expected, the bond strength increases as compressive strength of concrete increases and the diameter of bar decreases.