Influence of artificial accelerated cyclic corrosion on tensile behavior of reinforcement in concrete

Abstract

This study focuses on analyzing the tensile behavior of accelerated corrosion of rebar in reinforced concrete structures. The test specimens were created to accurately reflect the actual working conditions of reinforced concrete structures subjected to corrosion. Three types of test specimens corresponding to three types of rebar diameters of 12mm, 16mm, 20mm, concrete grades B25, B35 and B45, were immersed in a tank of 3.5% NaCl solution for certain periods of time. The steel specimens after the corrosion test were put into the tensile test. The results indicated that, the maximum load - slipping displacement reduce from D20, D16 and D12. There are no difference between specimens but in D16 and D20 ones, we can see this thing clearly. Based on this, the smaller diameter of rebar the more effectively connect between rebar and concrete. The bearing capacity decreased up to 40%, the deformation decreased up to 35%.

Keywords: Local corrosion; accelerated cyclic corrosion test; tensile behavior; Faraday principle.