Saudi Journal of Civil Engineering (SJCE)
Volume-5 | Issue-07 | 236-250
Original Research Article
Evaluation of Pullout Bond Effects of Inhibitive and Non-Inhibitive Reinforcing Steel
Gwarah Ledum S, Kelechi Okwulehie, Charles Kennedy
Published : Aug. 30, 2021
Abstract
The study examined the usefulness of exudates/resin extrudes from tree trunk as inhibitive material against corrosion attacks to reinforcing steel embedded in concrete structures and exposed to high levels of salt in coastal marine areas. The maximum recorded average and percentile values are controlled 45.546% against corroded and coated values of 36.881% and 78.747% and with differentially potential values of the bond strength controlled 1.409MPa and 19.437% against corroded values of 0.276MPa and 7.174% and coated values 1.409MPa and 20.317%. The lower load failure characteristic has been attributed to the effect of corrosion attack resulting in rib-less (smooth) and surface modification, the effect of corrosion resulted to the swollen surface with peeled off fibre while coated samples exhibited highly resistive characteristics to corrosion attacks showing the effectiveness of exudates/resin as an anti-corrosive material in curbing the scourge and menace faced by reinforced concrete structures built in the coastal the marine region with unique and severe characteristics of high salinity. Comparatively, obtained results showed decreased slippage failure load exhibition by the corroded samples over the controlled and coated samples with a highly lower value range to the reference with coated samples exhibiting higher slippage failure load with increased values over-controlled. From the result of average values and percentile values difference, the failure bond load, bond strength, and maximum slip all failed at low load applications with decreased percentile values compared to controlled and coated concrete cube samples. This reduction in rebar diameter and the cross-sectional area has resulted in higher failure bond loads, lower bond strengths, and lower slippages, and these characteristics revealed the effects of corrosion on the reinforcing steel that resulted from surface modification, reduction of rebar fibre, and high yield to load applications. From the results obtained and presented in the figures, the effect of corrosion on uncoated and coated reinforcing steel are enumerated, in figures 3 and 6b on the diameter of rebar, it can be seen that the diameter of uncoated decreased by the maximum value of -0.841% and coated increased by 0.922%, for the cross-sectional area, corroded has maximum reduction value -20.649% and coated increased by and 26.022%, weight loss, and gain are corroded -19.905% decreased (loss) and coated 36.334% increase (gain).