Effect of Rebar Corrosion Level on Behaviour of Reinforced of Corroded Columns

Abstract

Corrosion of steel reinforcement has been specified as the impairment mechanism of reinforced concrete buildings, which severely affects the safety and integrity of buildings. The corrosion of the embedded reinforcing steel in concrete is a significant trouble facing civil engineers nowadays, which initiates 80% of the reinforced concrete buildings impairment. This paper detects the outcomes of an experimental investigation on the mechanical performance of five squared steel reinforced columns which have been damaged by corrosion of the steel rebar. Small scale square reinforced concrete columns with a rectangular cross-section of b×h=150mm×150mm and 500 mm in height were adopted. Various degrees of steel reinforcement mass loss (corrosion damage) ranged between 8%, to 15 % were formed in the columns by using an accelerated galvanostatic corrosion method. The uniaxial compression test was carrying out for harmed columns up to failure. Based on the experimental outcomes, the corrosion damage had substantially reduced the performance of columns. The deterioration of the load capacity of corroded columns was 13.4%,24.6%,22.5% and 45.34% at level of corrosion damage of 8% and 15% respectively for longitudinal bars only and for longitudinal and ties reinforcement. The reduction of the axial and lateral deformation of corroded columns ranged between 7.1% to 70.22% and for corrosion level ranged from 8% to 15%, respectively. Likewise, the failure mode for corroded columns had been adversely affected by corrosion.