Saudi Journal of Engineering and Technology (SJEAT)
Volume-6 | Issue-07 | 197-213
Original Research Article
Corrosion Measurement of Reinforcement Mechanical Properties Embedded in Concrete Slab using Electrochemical Corrosion Potential Probability
Charles Kennedy, Igboka Maduabuchi, Irimiagha Paul Gibson
Published : July 30, 2021
Abstract
This research work investigated the application of Chrysophyllum albidum exudates/resin extracts as potential inhibitors in the control and prevention of corrosion attacks to reinforcing steel embedded in concrete slabs and are completely immersed in 5% sodium chloride (NaCl) solution in water and accelerated for a rapid corrosion process for 360 days with interval checks and routine tests of 90 days, 180 days, 270 days, and 360 days for examination and record documentations for comparison of tested sample performances. The maximum yields of controlled and coated samples were -112.42 mV and -118.97 mV, which showed the relationship between corrosion potential and opportunity in the reference range as 𝐸corr > −200mV and the uncoated samples, the calculated maximum value is -338.49 mV, the result is within the reference value of the dependence between corrosion potential and probability of −350mV ≤ 𝐸corr ≤ −200mV indicating a high-value range of 10% or an uncertain corrosion probability. The comparative results from the referencing range (controlled), showed that corroded samples exhibited corrosion presence resulting from the induced corrosion acceleration against coated samples that exhibited absence of corrosion. The results of the controlled concrete and armored resistance samples obtained at the maximum average value of 15.06kΩcm and 16.12kΩcm with a data value of 10 < 𝜌 < 20 (low) compared to a corrosion value of 9.82 k cm with a specification of 5 < 𝜌 < 10 (high). The calculated maximum percentage value of the controlled yield point is 7.05% relative to corrosion and coverage value -6.54% and 7.12% and the possible differential values of 0.02% controlled, 0.02% corroded, and 0 .15% covered. The percentage of maximum tensile strength calculated in the control is 2.39% relative to the corrosion and coating value -3.35% and 3.51% and the potential differential value is 0.04% controlled, 0.01% corroded and 0.04% coated. The yield strength, tensile strength, and deformation ratio of the mean, percentile, and controlled differential potential values, uncoated (corroded) and layered concrete slab samples were determined. , coated samples had higher breaking loads compared to corroded samples with reduced breakdown load and low load-bearing capacity and with mean and percentile values in relation to the reference range, whereas uncoated (corroded) samples, had a load-bearing capacity which is low and a reduced value compared to the reference range.For comparison, the results of corroded samples showed a decrease in value compared to the diameter of the reinforcement before and after the induction accelerated corrosion test with a percentage decrease in value from 0.428% to -1.48% and an average value in the range from 11.93 mm to 11. 88 mm.The differentials in mean values and relative percentiles between coated and corroded samples ranged from 69.57% to -41.03%. The decrease in mean and percentage values indicates that the corrosion effect causes a decrease in diameter and cross-sectional area, fiber degradation, rib reduction, and surface modification, while the exudate/resin-coated elements are validated in the work due to differential s in coating thickness. For comparison, the results obtained show a reduction/reduction and reduction of mean and percentile values for coatings with 0.070kg to 0.06kg and corrosion 7.81% to -5.8%. The summary results show that the corrosive effect had an impact on the rebar embedded in the concrete slab samples exposed to induced corrosion