Abstract
The coating material for textured finishes is effective for the carbonation suppression of concrete. However the carbonation suppressive effect decreases when the polymer of the coating material for textured finishes is deteriorated by ultraviolet rays, wind, rain, etc. This paper analyzes and proposes a prediction formula for the carbonation progress of concrete. In which the coefficient of diffusion of the coating material for textured finishes increases and the carbonation resistance decreases with time. It is based on the analysis model that carbon dioxide moves according to an approximation of a steady state of diffusion and the carbonation progresses. When the deterioration of the coating material for textured finishes is considered, the carbonation progress is expressed by the equation［13］. The carbonation progress is simulated using data from a previous experiment about the increase of the diffusion coefficient and the decrease of the carbonation resistance according to the deterioration of the coating material for textured finishes. At the beginning of simulation, the carbonation progress is similar to concrete with a coating material for textured finishes which doesn’t deteriorate. At the simulation progress, the carbonation progress is similar to concrete with a coating material for textured finishes which deteriorate. At the end of the simulation, the value of carbonation depth converges with the value of carbonation depth of non-finished concrete.
