Scholars International Journal of Chemistry and Material Sciences (SIJCMS)
Volume-4 | Issue-07 | 204-220
Original Research Article
Chloride Threshold Ingress Evaluation of Corrosion Probability Using Concrete Electrical Resistivity and Half-Cell Potential Measurements
Macmammah Michael, Gbinu Samuel Kabari, Charles Kennedy
Published : Aug. 21, 2021
Abstract
The application of Sticky gummy paste of anogeissus combretaceae exudates/resin extracted from tree extrudes was studied. It was used as an inhibitive material to control the manifestation corrosion effect on steel bars in built-in high salinity coastal areas. The extracted exudates/resin was coated to reinforcing steel and embedded in the concrete slab, exposed to corrosive media with high salt concentration. The results of maximum calculated percentile of the controlled sample value is -64.36% compared to the corroded and coated value of 154.98% and -60.05% and the controlled corrosion potential differential value is 1.19%, corroded 4.66% and coated 0.73% . The maximum yield of controlled and coated samples was -108.04mV and -122.85mV, which showed the relationship between corrosion potential and probability reference of 𝐸corr > −200mV as a reference range. For non-coated (corroded) samples, the maximum calculated value is -310.58mV; the result is within the reference value of the relationship between corrosion potential and probability of −350mV ≤ 𝐸corr ≤ −200mV value indicating a high value range close to 10% or an uncertain corrosion probability in comparison to the reference range. The maximum calculated percentile of the controlled sample concrete resistance is 141.67% compared to the corroded and coated value of -52.84% and 131.05% and the maximum percentile differential of control are 23.15% compared to the corroded and coated value of 3.87 % and 18.94%. The results of the controlled and layered concrete resistance samples obtained a maximum average value of 15.96kΩcm and 15.47kΩcm with a data value of 10 < 𝜌 < 20 (low) compared to a corrosion value of 7.28kΩcm with a specification of (5 <𝜌 < 10) and with the reference range of the relationship between concrete resistance and corrosion probability. The maximum percentile value calculated from the controlled yield strength is 9.96% against corroded sample and the coated value is -9.21% and 10.67% and the possible differentials value is 0.43% controlled 0.43% corroded and 0.52% coated. The calculated maximum values of the controlled tensile strength percentiles were 2.348% against corrosion and the coated values were -4.08% and 4. 27% and the potential differential values were 0.01% checked, 0.01%% corroded and 0 0.01% coated. The coated samples for yield strength, tensile strength and deformation ratio of the average, percentile and differential potential values of the control, plate samples. uncoated (corroded) and coated concrete had higher breaking loads compared to corroded specimens with reduced failure loads and low load bearing capacity and with average and percentile values compared to the reference range, whereas uncoated samples (corroded) indicated a low load-bearing capacity and reduced value compared to the reference range. The diameter of reinforcement after corrosion maximum calculated percentile value controlled 0.043% versus -1.11% corroded and 1.114% coated, the difference in percentage between corroded 0.121% versus 0.008% coated. The effect of corrosion attack on reinforcing steel embedded in the concrete slab and exposed to corrosion induced acceleration effect. The aggregate results show that the corrosion effect causes a weight reduction/weight reduction in the corroded samples compared to coatings with a percentage exposure and an average increase, resulting in a small increase in the volume of the coating thickness. This study shows the effectiveness and efficiency of exudates/resin as an inhibitor against the effects of corrosion on reinforcement embedded in samples of concrete slabs exposed to induced corrosion.