Abstract: Cracks reduced the overall strength and stiffness of concrete structures and accelerate the ingress of aggressive ions, leading to other types of concrete deterioration and resulting in further cracking. Aims: The study investigated the effectiveness of naturally occurring inorganic products of garcinia kola extracts (exudates / resins) as a protective membrane to reinforcing steel embedded in concrete. Members were immersed in severe corrosive environment and accelerated for 150days with examinations on changes of the mechanical properties of steel. Obtained flexural failure load percentile value of -29.0031% against 40.85115% and 39.32435% non-corroded and garcinia kola exudates coated specimens. Midspan deflection percentile value of 57.26586% against -36.4134% and -34.915% non-corroded and coated specimens. Average yield strength, of 460MPa, derived into 100% with 0.00% of percentile value. Average ultimate tensile percentile value of -10.0738% against 11.2023% and 11.58322% of non-corroded and coated specimens. Average strain ratio percentile value of -10.9146% against 12.25184% and 15.75587% of non-corroded and coated specimens. Average elongations percentile value of -41.3245% against 70.42903% and 74.90969% for non-corroded and coated specimens. Collated results of corroded members showed high yield strength with low applied load, high midspan deflection and elongation. Low flexural failure load with high yield. Indications showed that the attributes possessed by corroded members resulted from corrosion attacked on the surface properties of reinforcing steel and reduction in general mechanical properties of steel. Collated results from exudates / resins coated members exhibited low flexural failure load over corroded members with high, low midspan deflection over high in corroded, little elongation over high in corroded. Indications showed that coated members possessed resistance characteristics to corrosion penetration. Results from non-corroded (Controlled) members have high values of flexural failure load, low midspan deflection and yield strength, strain ratio and elongation over all corroded members.
Keywords: Corrosion, Corrosion inhibitors, Flexural Strength, Concrete and Steel Reinforcement.
Title: Residual Strength Capacity of Corroded and Coated Reinforcing Bars Corrosion Performance on the Flexural Strength of Reinforced Concrete Members
Author: Nwaobakata Chukwuemeka, Charles Kennedy, Sule Samuel
International Journal of Civil and Structural Engineering Research
ISSN 2348-7607 (Online)
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