This paper presents a series of analyses on the effect of finishing materials, environmental conditions, ages, completion years, and core compressive strength in the buildings constructed between 1953 and 1985 on carbonation of concrete. As a result, the carbonation ratio of concrete in outdoor environment and in ordinary classroom was 62% and 118% of that in living room, respectively. The correlation between the carbonation speed and core compressive strength was low. The carbonation speed of concretes that were made between 1965 and 1986 was slower than that before 1965.
