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Than 50MPa strength concrete mixing if the fiber explosion resistance, shrinkage resistance, toughness, and to contribute increases. However, a single fiber and strength in fiber coverage and fiber honipryang boost and high-rise structures temporarily were applied 27MPa or less regular strength concrete continuous endurance degradation and reinforcement is required and a lot of usage compared to quality for the efforts lacking and durability the time required is increased.
In this study, the general strength of concrete by mixing a small amount of hybrid fibers excellent crack reduction and the promotion daninseomyuboda goal is to find a hybrid fiber.