Development of highly durable concrete products to resist frost and salt damage

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Highly durable concrete can use for a long time, and have deterioration resistance. In recently year, durable concrete products which have deterioration resistance have been produced to make water less and dense concrete by progress of air entraining agents. Although, in such cold district as Tohoku, them suffer much damage such as scaling and collapse. Especially, a side ditch caver which has installed a load suffers complex deterioration by freeze-thaw repetition and salt damage by a lot of deicing salt. In this study, produced a ditch caver by using permeable form method, and performed surface layer strength test, freeze-thaw test and scaling test. The permeable form method drains excess water and air bubbles at concrete, and makes the concrete surface dense. The result of those test, increased the surface layer strength, frost damage resistance and scaling resistance. Therefore, permeable form method is effective to produce the highly durable concrete and can use for a long time.