Research on Crack Resistance of Mass Concrete of Bridge Structure
In order to solve the problem that thermal energy generated by hydration reaction in mass concrete affects the durability of bridge structure,MIDAS/FEA finite element simulation was used to analyze the influence of factors such as mold removal time and anti-cracking ad-ditives on temperature-time response and cracking risk coefficient of mass concrete.The results show that the temperature and cracking risk co-efficient of mass concrete increase rapidly at first,decrease slowly and then become stable with the increase of time.The temperature and cracking risk coefficient of reference concrete at all locations are higher than those of crack resistant concrete.The longer the demoulding time,the higher the cracking resistance of mass concrete,the demoulding time of 7 days+the addition of anti-cracking agent,the maximum crack-ing risk coefficient of mass concrete is less than 0.7,no cracking risk.
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