Analysis And Controlling Of Hydration Heat In Massive Concrete Pile Cap Of Hun Chun Bridge

With the great development of civil industry, the word " Mass Concrete of Pile Cap" in the field of bridge is more and more frequently, and compared with hydraulic engineering of large volume concrete, mass concrete of pile cap strength grade to high, cementitious material hydration reaction to produce more heat, hydration Heat is not easy control in large volume concrete of pile caps, and a project limit for time, many large volume cap have to be construct in the winter cold season, it will be much harder for controlling of hydration heat. In this paper, it is based on hunchun bridge engineering that is analysis and research the hydration heat of mass concrete pile caps,the main research content is as follows:(1) From the proposed mixture ratio to choose the optimal mix proportioning that is based on physical mechanics experiment and thermal Characteristics experiment, through physical and mechanical test that make a conclusion of different doped material influence on the strength of concrete at different ages, through the thermal performance test that is proposed adiabatic temperature rise of concrete empirical formula of correction coefficient.(2) The use of Midas/FEA of Hunchun bridge left and right Establish respective simulation model of the 6# cap, it is tune a model to limit the crack produced that is based on defining crack index, The change rule of temperature field and stress field under the condition of no cold tube or tube cold mass pile caps, The use of Midas/FEA analysis cold pipe related parameters that is effect of temperature field and stress field, it is concluded that applies to tube cold technology parameters of the project, it is close to the actual simulation different external curing temperature that is effect of temperature field and stress field, it is proposed staging of the curing temperature and temperature difference between inside and outside control values(3) According to the winter construction of Mass Concrete of pile cap on Hunchun bridge that is put forward dynamic monitoring to "constantly gathering, analysis, constantly adjust" as the criteria, it is used the solver function of MATLAB software, A real-time processing data in the process of monitoring that realizes the dynamic monitoring of mass concrete, to achieve the purpose of limiting crack in the end, according to the law of conservation of energy that infers the large volume concrete pipe cold center temperature experience formula, according to the construction process of the data storage information that is used of MATLAB’s data processing function, according to the empirical formula of temperature of large volume concrete pipe cold center calculation that combined with the actual monitoring data presents a generally applicable empirical formula the correction coefficient, it provides the calculation basis and the research train of thought for the tube cold mass concrete design, construction and monitoring.