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Title |
A Study on Survey of Carbonation for Sound, Cracked, and Joint Concrete in RC Column in Metropolitan City
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Keywords |
Carbonation ; Concrete ; Service life ; Crack ; Construction joint ; 탄산화 ; 콘크리트 ; 내구수명 ; 균열 ; 시공이음 |
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Abstract |
The concrete structures in Metropolitan city are usually exposed to carbonation and corrosion of embedded steel occurs due to the carbonation. In inspection and diagnosis of concrete structures, carbonation depth in sound concrete is mainly evaluated and service life for concrete structure is predicted based on the result. Generally, however, mass concrete structures such as columns have construction joint for suitable placing and also have cracks in early-age. In this study, carbonation depth in RC columns used for 20 years in metropolitan city is evaluated and also analyzed by considering the local conditions like sound, cracked, and joint area. The carbonation depth in cracked and joint area is more rapid than that in sound area, and it is thought to be more desirable to consider this effect in concrete structures with small cover depth. Furthermore, the technique for carbonation prediction in cracked concrete is derived in terms of crack width and the results from this technique are verified by comparing those from previous research.
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