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The carbonation velocity is produced an effect on carbon dioxide(CO2) density of surrounding near structures, the concrete quality and types of structures and this study was accomplished to draw a conclusion for estimated formula of carbonation velocity coefficient with various factors by the concrete quality on the base of the data of the durability surveyed in Korea. From the results of analysis of carbonation velocity, the followings were appeared. It is analyzed that carbonation velocity of the structures under urban area is 1.5 times faster than the rural area in the bridges case and it is 2.5 times faster than the rural area in the tunnels case. And the order of carbonation velocity of the structures under urban area is the buildings, the tunnels, the bridges and they are evaluated to progress about 2.7 times and 1.3 times faster than the bridges. In the rural area, the bridges are evaluated to progress about 1.3 times faster than the tunnels and it is analyzed that the carbonation velocity of the upper structures of the bridges under urban area is about 1.3 times faster than lower structures. The results which is compared to estimated formula of carbonation velocity coefficient of Kishitani equation which is generally applied for convert compressive strength into W/C ratios, most of those velocity of structures is faster than the results of Kishitani equation.

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