Anti-crack concrete suitable for large stations and construction method

Abstract

The invention discloses anti-crack concrete suitable for large stations and a construction method. The anti-crack concrete is prepared from the following raw materials in parts by weight: 167 parts ofwater, 296 parts of cement, 636 parts of river sand, 1039 parts of gravels, 7.42 parts of a delayed coagulation type water reducing agent, 40 parts of a magnesium anti-crack agent, 66 parts of fly ash, 88 parts of slag powder and 0.9 part of polypropylene fiber. The construction method comprises the following steps: embedding an embedded-type strain-temperature sensor, and preparing a concrete byadopting a double-doping technology; installing a form board, and carrying out concrete pouring; disassembling a side wall form board, curing with plastic film and double-layer thermal-insulation cotton, after top plate pouring, covering the plastic film for moisture preservation, and carrying out water storage maintenance. According to the anti-crack concrete suitable for large stations and theconstruction method, through optimization of concrete raw materials and the mix proportion and control over the internal and external temperature and stress of the concrete, damages to large-size concrete structures caused by crack development are prevented, and the stability and construction safety of the concrete structures are guaranteed.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to an anti-crack concrete suitable for large stations and a construction method. Background technique [0002] Temperature cracks are relatively common in concrete structures, mainly due to the large temperature difference between the interior and exterior of the concrete structure and unreasonable maintenance measures. When the cement is hydrated, a large amount of heat of hydration will be generated, and it is difficult to conduct heat transfer with the outside when it is gathered inside the concrete, while the heat on the surface of the concrete structure can be dissipated quickly, resulting in a large temperature difference between the inside and outside of the concrete structure, and a large temperature difference inside the concrete. Temperature stress, when the inside produces the stress of drawing greater than the maximum stress of drawing that concrete can bear, t...

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Problems solved by technology

The second is water shrinkage. When the concrete is solidifying, a large amount of water on the surface will evaporate and take away heat, which will also cause the volume of the concrete to shrink. In the process of water shrinkage, due to the rapid loss of surface water, it will be due to The problem of uneven internal shrinkage leads to an increase in the bearing pressure on the concrete surface, resulting in an increase in the surface pressure of the concrete, which in turn shrinks and deforms, resulting in cracks

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