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Development of High-flow and Crack-reduction Method for CFT Internal Mass Concrete

Recently, downtown buildings have tended to be super-high in connection with the rise in land prices and efficient use of buildings. In accordance with this trend, high-strength concrete is adopted for the structure of the building in relation to the improvement of cross-section efficiency, high-concrete concrete is reviewed in connection with good workability, and high-durability concrete for long-life buildings is used. In the case of large columns of, in addition to the safety of the structure, a very thick CFT inner mass concrete is adopted. Therefore, this study aims to solve the problem by using the case of CFT internal mass concrete as a target structure, as well as low heat mixing and separating mat concrete into multiple layers, adjusting the super-retardant amount in the lower layer. Through the pilot test results, it was confirmed that the internal temperature of the concrete was lowered and the fluidity increased through the decrease of the hydration heat at 36.5% W/B. Therefore, it is intended to secure the integrity between the upper and lower pouring concrete.