Reliability analysis of carbonation induced corrosion

Abstract

Reinforced concrete is widely used in the construction of buildings as newlineit is reasonably economical and provides large durability. However, a drastic newlinereduction in durability by corrosion could be noticed for the reinforced concrete newlinestructures located in environments with high carbon dioxide concentrations. newlineCarbonation could be induced when the atmospheric carbon dioxide reacts with newlinecement hydrates and forming calcite. Significant decrease in pH in the porous newlinesolution could induce corrosion of the reinforcing steel. newlineParameters governing carbonation of reinforced concrete structures newlinedepend on temperature, atmospheric carbon dioxide concentration and relative newlinehumidity, all related to time and climate change. The ambience around the newlineconcrete structures could be affected by a dynamic climate, particularly after a newlinelong time, resulting in declination of durability at a quicker rate. The increase in newlinecarbon dioxide concentration and temperature could result in an increase of the newlinecarbonation depth. Deterministic models for predicting carbonation depth newlineproposed by various researchers considered the effect of the increase in carbon newlinedioxide concentration, temperature while ignoring the significance of the change newlinein relative humidity. This study attempted to include the significance of relative newlinehumidity in employing spatial time-dependent reliability analysis for newlinecarbonation depth prediction. This analysis considered the effect of change in newlinetemperature, carbon dioxide levels and relative humidity on diffusion newlinecoefficients by taking all the three parameters as a time-dependent variable. newline