Relationship between crack width and reinforcement corrosion in cast-in-place RC open channels
2007
Ishii, M.(Shimane Univ., Matsue (Japan). Faculty of Life and Environmental Science) | Sato, S. | Ogata, H. | Nonaka, T.
Wide cracks in RC structures cause reinforcement corrosion and affect the durability of the structures. To determine the criteria of crack width to assure the durability for agricultural RC open channels, investigations for cast-in-place RC open channels are carried out. Concrete cores containing both cracks and reinforcements are collected from RC open channels which have been in service for a long period, and they are used to study the relationship between crack width and reinforcement corrosion. It is shown that harmful corrosion tends to occur with cracks wider than 0.4mm by a summary table with crack width and by discriminant analyses with crack width and reinforcement covering. The results of discriminant analyses show that reinforcement covering have little influences on reinforcement corrosion, since most of cracks in agricultural RC open channels are not bending cracks. It is indicated that corrosion does not progress in water and under the ground as badly as in the air, but the number of specimens is not sufficient to determine their particular criteria.
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