Abstract
The effect of corrosion on the structural behaviour of reinforced concrete (RC) beams without stirrups was experimentally investigated. A total of seven medium-scale RC beams without stirrups were constructed. The beams measured 150 mm wide, 250 mm deep and 1700 mm long. The test variables included: three different longitudinal reinforcement ratios (0.91%, 1.21%, and 1.82%) and two different corrosion levels (3% and 10%). Four beams were subjected to artificial corrosion whereas three beams acted as control un-corroded. Following the corrosion phase, all beams were tested to failure in three point bending. Corrosion crack widths and cracking patterns were recorded at different stages of corrosion. The effect of different longitudinal reinforcement ratios on the rate of corrosion was observed. Test results revealed that the beams with higher reinforcement ratios experienced slower corrosion rate compared to beams with lower reinforcement ratios. All control beams failed in shear whereas corroded beams failed in bond. There was a significant reduction in the load carrying capacity of the corroded beams without stirrups compared to the control beams.
Highlights
Corrosion of reinforcing steel is the most significant deterioration problem faced by reinforced concrete (RC) structures
This study investigates the failure mechanism and residual strength of reinforced concrete beams without stirrups damaged due to corrosion of their longitudinal bars
The reduction for beams L-0.91 and M-0.91 was 30% and 42.6%, respectively. These beams failed by bond and the bond strength decreases as corrosion level increases
Summary
Corrosion of reinforcing steel is the most significant deterioration problem faced by reinforced concrete (RC) structures. To efficiently rehabilitate corrosion damaged reinforced concrete structures, the residual strength and failure mechanism of the deteriorated structures must be determined For this purpose, a number of studies have been reported in the literature. A number of studies (Azam, Soudki 2013, 2012; Xue, Seki 2010; Toongeonthong, Meakawa 2004; Satoh et al 2003; Cairns 1995; Raoof, Lin 1997) have been reported in the literature on effect of corrosion on behaviour of RC beams without stirrups These studies assumed proper anchorage of the reinforcement but there may be conditions in service when anchorage. This study is focused on investigating the load carrying capacity of corroded RC beams without stirrups of which anchorage is impaired due to corrosion
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