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Saudi Journal of Engineering and Technology (SJEAT)
Volume-6 | Issue-10 | 326-342
Original Research Article
Behavioral Response of Concrete and Reinforcing Steel Bond Interface of Corrosion Induced Reinforced Concrete Structures
Charles Kennedy, Sylvester Obinna Osuji, Ebuka Nwankwo
Published : Oct. 5, 2021
DOI : 10.36348/sjet.2021.v06i10.001
Abstract
The research work investigated the potential use of exudates/resin to curb the surface and mechanical properties of the indentation from corrosion attack on reinforcing steel of both non-coating and exudates/resin coated samples after 360 days immersion in 5% NaCl solution. The obtained results maximum percentile failure bond load values of controlled samples are 64.308% against corroded -35.029% and the coated 68.823%. The differential maximum values computed of the average and percentile ranges of failure bond load are controlled (2.492kN and 14.869%) against corroded samples values are (0.806kN and 5.738%), coated are (2.492kN and 14.907%. The differentially potential maximum failure bond loads, as well as comparative values of maximum deflective values over-controlled and coated samples. The peak percentile bond strength values for comparison recorded are controlled 46.996% against corroded and coated -34.33% and 72.41%. The differential computed average and percentile values are controlled 1.409MP and 19.463% against corroded 0.276 MP and 7.669%, coated values are 1.408 MP and 20.134%. From the values obtained, the corroded samples exhibited a pullout bond strength compared to the increased values for the values of the coated samples and the controlled samples with pullout bond strength. The maximum recorded average and percentile values of controlled 86.42% against corroded and coated samples of -27.728% and 80.247% and with differential recorded values of the controlled 0.024mm and 42.379% against corroded values of 0.007mm and 16.793% and coated values 0.024mm and 41.881%. The maximum percentile values obtained for comparison among the investigated samples showed that the corroded exhibited lower slippage and reduced percentile values and low load application to failure, while coated samples exhibited higher slippage, and increased values. The obtained computed results of the nominal reinforcing steel with no traces of corrosion effect is 100%, the comparative results after corrosion and the potential differential values of the tested samples showed percentile values reduction in corroded samples resulting from induced effect from corrosion while the coated samples exhibited a potential increase in volumetric based on varying coating thicknesses. It can be seen that the diameter of uncoated decreased by the maximum value of 0.596% and coated increased by 0.674%, for the cross-sectional area, corroded has maximum reduction value -13.251% and coated increased by and 15.275%, weight loss, and gain are corroded -20.31% decreased (loss) and coated 29.25% increase (gain). Indication as analyzed from the experimental work showed that the effect of corrosion on uncoated concrete cubes caused diameter and cross–sectional area reduction and weight decrease while coated concrete cubes have diameter and cross–sectional area increases and weight gain resulting from the varying thickness coated to reinforcing steel.
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