Corrosion Influence on Mechanical Properties of Corroded and Inhibited Steel Bars in Concrete with Applied Currents Potential Measurement

摘要

Reinforcing steel passivity is broken down by a loss of alkalinity due to chloride attack orcarbonation of concrete structures found in the coastal marine environment. Investigative studies on thediminution of the trend of passivity loss was evaluated with the use of natural inorganic exudates / resins pasteof milicia excels on 12mm diameter reinforcement with coated varying thicknesses of 150μm, 300μm and450μm, embedded in concrete slab specimens, immersed partially in corrosive media with accelerated appliedcurrents potential of -200 mV through 1200mV, with a scan rate of 1mV/s to examined half cell potential,concrete resistivity and tensile strength properties for non- coated ( corroded) and coated concrete specimens.Results of concrete resistivity ρ, kΩcm versus potential Ecorr,mVrelationship which showed average potentialEcorr coated percentile value of 31.81826% and percentile difference -68.1817% over 232.0581% corrodedspecimen. Obtained average results of concrete resistivity ρ, percentile average value is 185.4484% andpercentile difference 85.44844% over -41.9254% corroded specimen. Obtained average mechanical properties“ultimate strength” of coated specimen percentile value of 97.66965% and percentile difference -2.33035%over 7.621406% corroded specimen. Average mechanical properties “weight loss of steel” of coated percentilevalue of 58.97121% and percentile difference -41.0288% over 70.73893% corroded. Average mechanicalproperties “cross- section area reduction” of coated percentile average value 114.0564% and percentiledifference 14.05639% over -12.3241% corroded specimen. Coated specimens result showed no corrosionpotential. Corroded specimen cross- section area reduction results showed higher percentile reduction valuesdue to effect of corrosion on the mechanical properties of steel. Corroded specimen results of weight loss ofsteel showed higher percentile values against control and coated specimens due to surface attack andfibre/ribbed removal from corrosion effect on the mechanical properties of steel. High ultimate yields ofcorroded specimens with low load application to control and coated specimens resulted to corrosion attack onthe mechanical properties of steel reinforcement.