Early-strength and high-impermeability lining concrete and preparation method thereof

Abstract

The invention relates to early-strength and high-impermeability lining concrete and a preparation method thereof. The early-strength and high-impermeability lining concrete is prepared from cement, fly ash microspheres, machine-made sand, gravel, an impermeable functional material, an early strength agent, a polycarboxylic acid high-efficiency water reducing agent, a mud blocking agent and water.According to the invention, waste limestone powder and kaolin are subjected to composite modification, the prepared impermeable functional material can improve the impermeability of a lining to avoidcorrosion of a reinforcing mesh, the hydration temperature rise of concrete can be reduced after limestone powder replaces part of cement, and due to the fact that the high-activity fly ash microspheres, the ball effect and the micro-aggregate effect are adopted, the workability and compactness of the concrete are enhanced, and the homogeneity of the concrete is improved. According to the early-strength and high-impermeability lining concrete and the preparation method thereof, high-mud-content machine-made sand can be adopted to replace natural river sand, and the prepared early-strength andhigh-impermeability lining concrete is excellent in working performance, mechanical performance, volume stability and crack resistance.

Description

technical field [0001] The application relates to the field of building materials, in particular to an early-strength and high-impermeability lining concrete prepared by using machine-made sand with high mud content and a preparation method thereof. Background technique [0002] At present, there are many mountains in the western region, and there is an urgent need to build a batch of large-scale tunnels with good quality, excellent mechanical properties, economical cost and easy construction. However, the river sand resources required by the local project are scarce, and in order to protect the river bed, it is planned to use the sand and gravel waste generated by tunnel excavation and crush them to make machine-made river sand. [0003] However, machine-made sand is artificially crushed, and it is inevitable to introduce some fine stone powder and mud powder with a particle size of ≤0.075mm in the production process, especially the high content of mud powder will cause the...

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Problems solved by technology

[0004] The embodiment of the present application provides an early-strength high-impermeability lining concrete that can be prepared by using high-mud-content machine-made sand and its preparation method, so as to solve the problem of easy cracking in the early stage of concrete prepared by using high-mud-content machine-made sand in related technologies

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