Ballastless track base concrete slump-retaining anti-cracking material and preparation method thereof

Abstract

The invention belongs to the technical field of building materials, and particularly relates to a ballastless track base concrete slump-retaining anti-cracking material and a preparation method thereof. The slump-retaining anti-cracking material is prepared by mixing a shrinkage-reducing slump-retaining type polymer component, a retarding component, a hydration temperature rise inhibiting component, a composite anti-cracking component, a water storage component and a reinforcing and toughening component according to a certain proportion, wherein the mass ratio of each component is as follows:1.0-4.5 parts of the shrinkage-reducing slump-retaining type polymer component, 0.5-1.5 parts of the retarding component, 1-10 parts of the hydration temperature rise inhibiting component, 66-95 partsof the composite anti-cracking component, 0.5-10 parts of the water storage component and 2-8 parts of the reinforcing and toughening component. The ballastless track base concrete slump-retaining anti-cracking material provided by the invention is doped into concrete according to a proper mixing amount, the slump loss of the concrete can be avoided within 3 hours, the adiabatic temperature riseof the concrete is reduced by more than 20%, the shrinkage variation of the concrete in a plastic stage and a hardening stage is remarkably reduced, the maximum reduction coefficient of concrete cracks can reach 92%, and the anti-cracking efficiency grade reaches first grade.

Description

technical field [0001] The invention belongs to the technical field of building materials. In particular, it relates to a ballastless track base concrete slump-preserving and cracking-resisting material and a preparation method thereof. Background technique [0002] In recent years, my country's CRTSⅢ slab ballastless track structure with independent intellectual property rights has been widely used in high-speed railways. The base concrete is the lowest structural part of the CRTSⅢ slab ballastless track structure. Safety and durability of track structures. When the ballastless track is in a harsh environment, the risk of cracking of the base concrete is significantly increased. This is due to the difference between the temperature and humidity of the interior and surface of the concrete and the environment in which it is located, resulting in temperature stress and drying shrinkage stress inside and on the surface of the concrete. When the above two stresses exceed the ul...

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Problems solved by technology

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to prepare a concrete slump-preserving and crack-resistant material, which solves the problem of large loss of concrete workability over time due to the addition of water storage materials, and solves the problem of hardening concrete The problem of high hydration temperature, large shrinkage in the plastic stage and the hardening stage

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