Scholars International Journal of Chemistry and Material Sciences (SIJCMS)
Volume-4 | Issue-06 | 158-173
Original Research Article
Effects of Corrosion on Mechanical Properties of Reinforcing Steel Residual Flexural Strength
Ibor Benjamin, Charles Kennedy, Ibete Felix Wurah
Published : July 30, 2021
Abstract
The study examined the use of exudates/resins from extracts of natural origin for environmentally friendly materials derived from tree trunks. Gummy exudates/resin was applied directly to the steel reinforcement by the coating of different thicknesses. The purpose of this study is to determine the role of exudates/resin against adverse attack on reinforcement embedded in concrete, exposed to the severe environment due to its waterproofing and resistance to surface modification of steel reinforcement and coating application. In the flexural strength test, the maximum value was 28.36% compared to the corroded and coated sample values of -20.02% and 28.37%, respectively. Mean differential and percentile range controlled (0.96kN and 3.07%), corroded (0.82kN and 2.08%), coated (1.13kN and 3.33%). The results of midspan deflection mean value and percentage difference were controlled (0.27kN and 1.66%), corroded (0.57kN and 4.61%), and coated (0.27kN and 1.68%). The results showed a lower elongation load in the controlled and coated samples with reduction values over the corroded samples with higher elongation loads and higher values compared to the reference range (controlled). The cross-sectional area of reinforcing steel recorded the mean differential values and calculated percentile values, corroded (0.06 mm and 5.21%) and coated values (0.05 mm and 7.12%). The results obtained showed the effect of corrosion on the mechanical properties of reinforcing steel with a decrease in the diameter of the reinforcement in the corroded sample, while the coated sample showed an increase due to the thickness of the exudates paste layer. The differential computed average and percentile value of the yield strength and ultimate tensile strength are controlled (5.31MPa and 1.16%) and (2.53MPa and 0.02%), the corroded values are (3.18MPa and 1.05%) and (2.53MPa and 0.02%), the coated values are (5.3MPa and 1.16%) and (2.53MPa and 0.02%). The percentages of maximum weight loss/gain for corroded and coated samples were -28.54% and 43.9%, respectively. The calculated data showed a decrease in the value of the corroded sample as a result of the corrosion attack, which led to a decrease in the registered weight, whereas the coated sample showed an increase in weight compared to the reference value of the controlled sample due to the different coating thickness.