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Saudi Journal of Civil Engineering (SJCE)
Volume-5 | Issue-06 | 165-182
Original Research Article
Evaluation of Probabilistic Potential of Chloride-Induced Corrosion on Modification of Steel Bar in Reinforced Concrete Structures Exposed to Severe Media
Overo Kenneth Ejukonemu, Arube Goodnews Emuakpo, Charles Kennedy
Published : July 30, 2021
DOI : 10.36348/sjce.2021.v05i06.004
Abstract
The research evaluated the potential occurrence of corrosion in an induced media assessing the coating of reinforcing steel with Boswellia dalzielii (Burseraceae) exudates/resin gotten from the trunk of trees, the coating varies in thicknesses, embedded in concrete slabs, and exposed to the high severed coastal marine environment with acidic content. The maximum stability value calculated concrete resistivity from the controlled concrete sample was 63.55% compared to the corroded and coated values -44.28% and 84.61%, and the maximum controlled differential percentile was 2.8% compared to the corroded and 1.55% values and 5.53% coverage. The test results of controlled and coated samples with concrete resistance got a maximum average value of 14.38kΩcm and 16.28kΩcm with a value of 10 <𝜌 <20 (low) compared to a corrosion value of 8.85kΩcm with an indication of 5 < 10 (high) and the reference range of the relationship between concrete resistance and corrosion probability. The maximum obtained and corrosion potential values of the controlled and coated samples were -107.3mV and -121.5mV, indicating the relationship between corrosion potential and probability as 𝐸corr > −200mV as the reference range. The results of this potential Ecorr result show that the value of controlled and resin-coated samples is low with a 90% probability that no corrosion of reinforcing steel is observed during the measurement (10% risk of corrosion, which averages 10% for samples without coating obtained maximum value - 341.7mV, the result lies in the correlation reference value between the corrosion potential value −350mV ≤ 𝐸corr ≤ −200mV indicating a high range of values. The calculated maximum percentile ultimate tensile strength of controlled tensile strength is 2.06% compared to corrosion and coating values of 1.96% and 2.05%, and the possible differential values are 0.06% controlled, 0.01% corroded and 0.03 % coated. The calculated maximum percentile yield strength value of the controlled shear strength is 8.28% compared to the corroded and coated values of -7.61% and 8.28% and the controlled potential differential values are 0.05%, corrosion is 0.04% and 0.05% coated. The comparison results show that the low load carrying capacity is caused by the effect of corrosion attack on the exposed (corroded) elements, which damage reinforcing steel fibers, ribs and passive formations and surface modifications. The avearge values observed for the coated samples relate to the corrosion resistance potential to penetrate the reinforcing steel to form a protective membrane; This attribute indicates the effectiveness and effectiveness of the exudate/resin as an inhibitor against corrosive effects. exposed reinforced concrete structure on the edge of a strong sea area with high salinity. The maximum calculated percentile of corroded is 0.396% versus -1.17% and coated is 0.721%, the differential in the percentile of corrosion is 0.03% versus 0.003% coated. For comparison, the results of corroded samples showed reduction and reduction values compared to the diameter of the reinforcement before and after accelerated induction corrosion testing with a percentile decrease in value from 0.396% to -1.17% and an average value in the range of 11.93mm to 11.93mm. The differential in average and relative percentile between coated and corroded samples varied from 26.42% to -20.9%. The decrease in average and percentile values indicates that the corrosion effect has led to a reduction in diameter and cross-sectional area, fiber degradation, rib reduction and surface modification, while elements coated with exudates/resin confirm an increase in volume as thickness as there are shift differentials.
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