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Title |
The Analysis of Cracks in PSC Girder Using High Flowing Concrete
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Keywords |
균열 ; 고유동 콘크리트 ; 수화열 ; 매스콘크리트 ; 건조수축 ; Crack ; High flowing concrete ; Heat of hydration ; Mass concrete ; Shrinkage |
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Abstract |
Recently, mass concrete with high flowability are widely used to improve the quality and constructability in the longer span construction of prestressed concrete bridges, but it may induce nonstructural cracks due to the hydration heat and autogenous shrinkage etc. The stresses in concrete were evaluated by various experiments and numerical analysis. The tensile stress in mass concrete was increased in connection with the accumulation of hydration heat. Moreover, large amount of autogenous shrinkage from powder type admixture could add the tensile stress to mass concrete near anchorage zone. The tensile stresses in anchorage zone by heat and autogenous shrinkage exceeded the tensile strength of early stage of concrete, and small amounts of stress increasement were shown in other parts of PSC girder.
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