Construction method for mass concrete temperature crack control

Abstract

The invention discloses a construction method for mass concrete temperature crack control, and belongs to the technical field of concrete construction. The construction method comprises aluminum-plastic pipes embedded in concrete, a temperature measuring sensor, copper joints connected with the aluminum-plastic pipes, a flexible conduit on the surface of concrete, an iron wire used for connectingthe aluminum-plastic pipes and the flexible conduit, a U-shaped buckle used for fixing the flexible conduit, a plastic film, felt and a flame-retardant heat preservation quilt, wherein the aluminum-plastic pipes embedded in the concrete are made of any one of a medium-density cross-linked polyethylene material, a high-density cross-linked polyethylene material and medium-density polyethylene; andthe precision of the temperature measuring sensor in the range of 0 to 120 DEG C is 0.5 DEG C, and the temperature measuring sensor detects the temperature. According to the construction method, the creep of the concrete is fully exerted, and the temperature stress is remarkably reduced, so that the anti-cracking safety degree of the mass concrete is greatly improved, the temperature difference between the interior of the concrete and the surface of the concrete is reduced, the possibility of crack generation is reduced, and a heat preservation effect with an obvious effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of concrete construction, and in particular relates to a construction method for controlling temperature cracks in large-volume concrete. Background technique [0002] The "Code for Construction of Mass Concrete (GB50496-2018)" defines mass concrete as follows: the minimum size of the concrete structure entity is not less than 1m, or it is expected that the temperature change and temperature caused by the hydration of the cementitious material in the concrete Concrete that shrinks and causes unwanted cracks. [0003] At present, my country's basic construction is in a period of rapid development with each passing day, and structures such as high-rise buildings and long-span bridges are increasing day by day. For these buildings to have reliable stability, it is inseparable from their foundation structure, which is basically a mass concrete structure. [0004] Due to the difference in the heat dissipation r...

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Problems solved by technology

[0005] At present, the control of temperature cracks in mass concrete foundation structures is mainly carried out from the following aspects: optimize the mix ratio, select materials with better toughness as admixtures to improve the ultimate tensile of concrete, and avoid tensile stress damage; set deformation joints, It is mainly reflected in the setting of induction joints, the use of "layered block" method, "jump warehouse method" and the use of "post-pouring belt" treatment technology in the process of concrete pouring, which should be combined with the actual situation of the site; Steel pipes or even high-strength polyethylene pipes are used, but there are no more creative suggestions on the layout form, and the cooling effect is not very obvious; thermal insulation measures, especially during construction in winter, should strictly pay attention to thermal insulation, and the thickness of the thermal insulation layer needs to be Accurate calculations and the lack of more constructive opinions on the laying of the insulation layer, these aspects need to be resolved urgently

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