Assessment and comparison of carbonation-induced corrosion in the interior and exterior surfaces of academic buildings (2013)
LIM, JV James Kristofferson
WEE ENG, Keeshia Rose
-The study focuses on the comparison of carbonation and its corrosion risk assessment between exterior and interior surfaces of academic buildings in Quezon City. Carbonation data was gathered using Carbonation Depth Method through phenolphthalein spray while corrosion risk was obtained using Half Cell Potential Technique through Ag/AgCl reference electrode. Using Fick’s First Law of Diffusion, the average carbonation rates of the interior and exterior surfaces of each building were obtained. Bayesian Belief Network analysis was also performed to compare theoretical values with actual ones and a model was devised to determine carbonation depth based on surface condition and carbon dioxide concentration The data obtained from the two methods were used to provide analysis on which surface would be more susceptible to carbonation and corrosion risk. Keeping in mind the environment factors, the study was able to investigate the correlation between carbonation and corrosion risk within interior and exterior surfaces. An expectation of higher carbonation depths in interior surfaces was met as shown in the results; however, the anticipated relationship of high carbonation depth with high corrosion risk was not met. From analyzing the data, most of the buildings are either at low or intermediate risk of corrosion but further studies on cholride-induced corrosion should be done for a more comprehensive study of the integrity of the structures.
Engr. Rolando Gallardo