Abstract
The key problem of mass concrete temperature control is to effectively control the maximum temperature inside concrete, the temperature difference between inside and outside concrete, and the temperature difference between surface and environment. The size of the main tower cap of No. 3 Jinsha River Bridge is 37 m × 23.5 m × 5.5 m, and the cubic volume of concrete reaches 4782.3 m3, which is poured in two times. In order to ensure construction quality of mass concrete structure, prevent the large mass concrete temperature stress, through the numerical simulation of the temperature control and optimization scheme, by optimizing the mixture ratio design, reducing the temperature of concrete pouring into the mold, cooling water cycling, insulation keeping in good health and a series of measures to effectively achieve the control goal, and eliminating the temperature cracks. The measured data show that the maximum temperature inside concrete, the temperature difference between inside and outside, and the temperature difference between surface and environment are qualified, but the temperature difference control of cooling water inlet and outlet has hysteresis effect, and the temperature difference between inlet and outlet will be greater than 10°C, which should be noticed.
Highlights
Concrete has been widely used in all kinds of buildings, such as bridges, dams, and other structures
According to the Construction Code for Mass Concrete (GB 50496-2018) [1,2], mass concrete with the minimum size of concrete structure entity not less than 1 m, or concrete that is expected to cause harmful cracks due to temperature change and shrinkage caused by hydration of cementing materials in concrete, is regarded as mass concrete. erefore, temperature control is an urgent problem to be solved in mass concrete construction, and reasonable and effective technical measures must be taken to deal with it properly
The No 3 main tower cap of Jinsha River Bridge is taken as the research object, and a series of temperature control measures, such as optimizing the mix ratio design, reducing the temperature of concrete pouring into the mold, cooling water circulation, heat preservation, and health preservation, are studied to explore the effective means to achieve the temperature control target effectively and eliminate temperature cracks; at the same time, the measured data and simulation data are compared and analyzed to provide reference for temperature control of mass concrete construction
Summary
Concrete has been widely used in all kinds of buildings, such as bridges, dams, and other structures. Yuan et al [4] used the measured temperature field of hydration heat in No 0 block of a continuous box girder and established a cooling pipe water circulation model by using finite element analysis method under the condition that the noncooling pipe water circulation model was consistent with the measured temperature field and analyzed the cooling effect and crack control effect of the cooling pipe water circulation model He et al [5] analyzed the casting thickness effect on the internal temperature and stress of mass concrete and cooling water and and selected the suitable casting and temperature control scheme for Rongjiang Bridge project. The No 3 main tower cap of Jinsha River Bridge is taken as the research object, and a series of temperature control measures, such as optimizing the mix ratio design, reducing the temperature of concrete pouring into the mold, cooling water circulation, heat preservation, and health preservation, are studied to explore the effective means to achieve the temperature control target effectively and eliminate temperature cracks; at the same time, the measured data and simulation data are compared and analyzed to provide reference for temperature control of mass concrete construction
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