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A method for preventing concrete temperature cracks in underground side wall structures

A technology of concrete temperature and side wall structure, which is applied in the field of concrete crack control and concrete construction. It can solve the problems of concrete temperature cracks, difficulty in reducing concrete mold temperature, and rise in concrete temperature, so as to reduce hydration temperature rise and improve volume stability. The effect of shortening the time of temperature change history

Active Publication Date: 2018-08-31
JIANGSU SOBUTE NEW MATERIALS
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] Aiming at the concrete of the underground side wall structure, in order to solve the problem of concrete temperature cracks caused by factors such as the difficulty in lowering the temperature of the concrete entering the mold and the high temperature rise of the concrete in the high temperature environment in summer, the invention discloses a method for preventing cracking of the concrete temperature cracks of the underground side wall structure. Specifically, this is achieved:

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  • A method for preventing concrete temperature cracks in underground side wall structures
  • A method for preventing concrete temperature cracks in underground side wall structures
  • A method for preventing concrete temperature cracks in underground side wall structures

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Embodiment

[0042] An underground side wall structure with a thickness of 80cm, a height of 6m, a single pouring length of 20m, and an ambient temperature of 34.2°C is used for pouring construction of C40 concrete. The initial setting time is 10 hours, and the hydration temperature rise is 33.5°C. The engineering results show that the side walls are severely cracked, with one temperature crack every 0.8 to 1.5 meters; after that, the temperature of the concrete entering the mold is controlled at 31.5°C, the initial setting time is 10.5h, and the hydration temperature rise is 33.2°C. The engineering results show that the side walls are severely cracked, with one temperature crack every 1.0 to 1.6 meters; the technical results of the two constructions show that in the high temperature environment in summer, The engineering effect of this project is that the concrete only reduces the mold entry temperature by about 5°C, and only reduces the initial mold entry temperature. Under the premise of...

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Abstract

The invention discloses an underground side wall structure concrete temperature crack anticracking method. Directed at the problem of easy cracking of underground side wall structure concrete under a summer high temperature condition, low temperature airflow is introduced into a hollow structure temperature control template by a refrigerating machine of an intelligent control system, so that concrete starts to cool after entering a die, i.e. substantially lowering the concrete's temperature of entering the die. At the same time, the intelligent control system takes a measured stress value, a capillary negative pressure value and a wall center temperature value as the conditions for controlling the working mode of the refrigerating machine, so that the actual stress value of the concrete from pouring to die removal is always close to but not greater than an ultimate tensile stress value of concrete, thereby realizing effective temperature control of underground side wall concrete, and avoiding temperature cracks.

Description

technical field [0001] The invention relates to the technical field of concrete construction and the technical field of concrete crack control, in particular to a method for preventing concrete temperature cracks in an underground side wall structure. Background technique [0002] The cracking problem of underground side wall structural concrete, such as underground rail transit side walls and construction engineering underground side walls, is a very difficult problem to solve and overcome in the field of concrete engineering. The cracking method is mainly temperature cracking, especially in summer. In a high-temperature environment, it is difficult to lower the temperature of concrete into the mold, and the hydration temperature of concrete is high, which often leads to serious temperature cracks. [0003] At present, the methods to reduce the temperature cracks of the underground side wall mainly include the additive method and the physical cooling method. The additive me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B40/00E02D5/18E02D15/02
CPCC04B40/0075E02D5/18E02D15/02E02D2250/0007E02D2300/002
Inventor 张建亮田倩姚婷李华王育江夏强李明
Owner JIANGSU SOBUTE NEW MATERIALS
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