Spatial Thermal Crack Control in Mass Concrete

Spatial Thermal Crack Control in Mass Concrete

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摘要 The finite element software,MIDAS is used to predict the distribution of temperatures and,analyzes the cracking control methods within a hydrating mass concrete.The temperature control of mass concrete has great significance in assuring the project quality.Adiabatic or semi adiabatic temperature measurement is mostly used for measuring and controlling the temperature fluctuation during construction.The temperature distribution produced by the finite element thermal analysis of the model is used to quantify the maximum allowable internal temperature difference before crack initiation on concrete.This study analyzes the data from one high-rise structure project in Shanghai are used to verify the finite element model developed.Results suggest that reliance on a limiting maximum temperature differential to control cracking in massive concrete applications should be supplemented with a requirement for analysis showing the calculated spatial temperature and stress response to the predicted temperature distribution within the concrete,to ensure that the induced tensile stresses will not exceed the tensile strength of the concrete and so minimize the risk of having thermal cracks at early age. The finite element software, MIDAS is used to predict the distribution of temperatures and, analy- zes the cracking control methods within a hydrating mass concrete. The temperature control of mass concrete has great significance in assuring the project quality. Adiabatic or semi adiabatic temperature measurement is mostly used for measuring and controlling the temperature fluctuation during construction. The temperature dis- tribution produced by the finite element thermal analysis of the model is used to quantify the maximum allowa- ble internal temperature difference before crack initiation on concrete. This study analyzes the data from one high-rise structure project in Shanghai are used to verify the finite element model developed. Results suggest that reliance on a limiting maximum temperature differential to control cracking in massive concrete applica- tions should be supplemented with a requirement for analysis showing the calculated spatial temperature and stress response to the predicted temperature distribution within the concrete, to ensure that the induced tensile stresses will not exceed the tensile strength of the concrete and so minimize the risk of having thermal cracks at early age.

作者 Munishi Fred Abel ZHANG Shengdong LI Minying

机构地区 Department of Building Engineering Shanghai No.

出处《结构工程师》北大核心 2012年第6期54-59,共6页 Structural Engineers

关键词温度分布混凝土施工技术应力 thermal cracking, temperature gradient, mass concrete, fly-ash, finite element

分类号 TU528 [建筑科学—建筑技术科学]

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Spatial Thermal Crack Control in Mass Concrete

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