CORROSION DETECTION OF STUDS IN STEEL-CONCRETE COMPOSITE STRUCTURES BY HALF-CELL POTENTIAL TEST

Half-cell potential method was employed to detect the corrosion of studs in steel-concrete composite structures after natural exposure in air for 7 years，which had experienced mechanical test． It was explored the applicability of ASTM C876 based on destructive test ． The influence of the electrode distance，the wetness degree of concrete surface，the thickness of concrete cover and the rebar mat on the electrochemical potential of studs was preliminarily studied． The results showed that the electrode distance did not affect the stud potential when the concrete surface fully wetted． However，the wetness degree and the thickness of concrete cover had a remarkable effect on the studs' potential． The influence of rebar mat needs further study． Based on the results obtained by nondestructive and destructive tests，it is concluded that the ASTM C876 method is still applicable to judge the corrosion state of studs in the composite structures．