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Title |
Applicability of High-strength Mass Concrete through Setting Time and Horizontally-divided Placement
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Authors |
조승호(Seung-Ho Cho) ; 백인관(In-Kwan Paik) ; 이동하(Dong-Ha Lee) ; 노영숙(Young-Sook Roh) |
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DOI |
https://doi.org/10.11112/jksmi.2017.21.2.103 |
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Keywords |
매스콘크리트 ; 고강도 콘크리트 ; 지연제 ; 온도이력 ; 온도균열지수 Mass concrete ; High strength concrete ; Retarding admixture ; Temperature history ; Temperature crack index |
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Abstract |
In the current study, retarding type and standard type admixture design of concrete have been proposed to control the generation of hydration heat for foundation members that use high strengths concrete. Finite element analysis also has been conducted to understand the rational placing heights of concrete. In addition, real-size structures have experimented and their results were compared to the analytical results to evaluate the reducing effect of thermal stress . For a large 6.5 m×6.5 m×3.5 m member with retarding and standard type horizontal partition placement of concrete showed the manageable possibility of temperature difference within 25-degree Celcius between the middle and surface portion while the maximum temperature was 77-degree Celcius. Also, temperature cracking index from the finite element analysis appeared to be 1.49 that predicts no formation of cracking due to the effects of temperature. Finally, it appeared that horizontal partition placement of retarding and standard type concrete has the significant effect of reducing the thermal stress that generated by the hydration heat in the high strengths mass concrete.
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