ASSESSMENT OFCORROSION INITIATIONTIME ONCOSTAL CONCRETE STRUCTURE –A CASE STUDY

Narayan Chandra Moharana, Bikasha Chandra Panda

Abstract: The durability and serviceability of R.C structures which are located incostal environment are always vulnerable to corrosion of reinforcement. It is impossible to prevent even by providing an additional cover and good construction practice but can be slow down. After construction of concrete structure prediction of corrosion initiation time is very important so as to plan periodic maintenance schedule. The present work aims to determine the chloride diffusion coefficient of the concrete existing in the marine environment of Odisha. For this purpose, Seven concrete samples of demolished structures of known age from Puri and Paradeep are collected. Experiments have been conducted to find the concentration of soluble chloride in different depth by using potentiometric titration. Then the diffusion coefficient is determined by using equation of fick slaw. The corrosion initiation time have been predicted using again the Fick’s 2nd law of diffusion. Lesser corrosion initiation time indicates higher vulnerability towards corrosion of reinforcement and vice versa .Therefore preventive measure scan be taken to slow down the chloride penetration enhance the durability of structure.

Keywords: Corrosion, Chloride Ingress, Diffusion Coefficient, Carbonation, Reinforcement.

DOI: https://doi.org/10.15623/ijret.2016.0510036