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Title |
Heat of Hydration and Thermal Crack Control for Floating Concrete Mass Foundation
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Keywords |
콘크리트 수화열 ; 균열지수 ; 부상식 콘크리트 기초 ; 대류경계조건 Heat of hydration ; Crack index ; Floating concrete mass ; Convection condition |
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Abstract |
A total of 6 stepwise constructions were made for building the floating mass concrete foundation. The optimal curing strategies and specialized construction guidelines were adoptively extracted from the 1.5m cube mock-up test prior to the main concrete work. Two different thermal crack index(TCI) calculations from current construction manual exhibit relatively low values as comparing the measured temperature data. This implies that the hydration-induced cracking could be developed in parts of concrete mass. However, the controversial phenomenons in reality were observed. No significant surface cracks are detected at the successive construction stages. Thereby, this paper raises the question regarding on the existence of characteristic length with varying size and shape of a target specimen which are missing in the current construction manual. The isothermal core area and high thermal gradient area in the edge volume should be identified and be introduced to TCI calculation for the purpose of an accuracy.
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