Controllable low-strength material based on shield slurry and regenerated sand powder as well as preparation method and application of controllable low-strength material

Abstract

The invention discloses a controllable low-strength material based on shield slurry and regenerated sand powder as well as a preparation method and application of the controllable low-strength material. The controllable low-strength material based on the shield slurry and the regenerated sand powder comprises a cementing material, compound regenerated sand powder, the shield slurry, a water reducing agent, a coagulant and water, wherein the compound regenerated sand powder is formed by compounding regenerated sand powder with the particle size of 0.075-0.30 mm, regenerated sand powder with the particle size of 0.30-1.18 mm and regenerated sand powder with the particle size of 1.18-4.75 mm. The preparation method of the controllable low-strength material comprises the following steps: uniformly mixing the cementing material, the compound regenerated sand powder, the shield slurry, the water reducing agent, the coagulant and the water. The controllable low-strength material is high in fluidity, high in stability and controllable in strength, bleeding is avoided while high fluidity is guaranteed, and the controllable low-strength material is simple in preparation process and low in cost and has remarkable social benefits and economic benefits.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a controllable low-strength material based on shield mud and recycled sand powder, a preparation method and application thereof. Background technique [0002] A large amount of shield mud with high moisture content will be produced during shield tunneling. The usual disposal method is to reuse it after flocculation, pressure filtration and drying. There are problems such as high processing cost and complicated processing process. After dehydration and drying, the mud is hardened and difficult to disperse evenly, which increases the difficulty of subsequent reuse. In addition, in the process of shield tunneling, in order to facilitate the tunneling operation of the shield machine underground, a large amount of chemical substances such as foaming agent, grease, mudstone dispersant, etc. are usually sprayed on the shield machine disk, which further It increases the diffi...

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Problems solved by technology

[0002] A large amount of shield mud with high water content will be produced during the shield tunneling process, and the usual disposal method is to carry out flocculation, pressure filtration and drying on it before re-processing. Utilization, there are problems such as expensive treatment cost and complicated treatment process, and after dehydration and drying, the mud is hardened and difficult to disperse evenly, which increases the difficulty of subsequent reuse

In addition, in the process of shield tunneling, in order to facilitate the tunneling operation of the shield machine in the ground, a large amount of chemical substances such as foaming agent, grease, mudstone dispersant, etc. are usually sprayed on the disk of the shield machine. It increases the difficulty of reuse of shield mud, and improper handling of shield mud will pollute the environment

[0003]At present, the demolished construction waste is mainly reused in the form of recycled aggregate, and about 40% of recycled sand will be produced in the production process of recycled aggregate Powder (particle size<4.75mm), the gradation of recycled sand powder is poor, the content of fine powder is high, and the activity is low. It is difficult to directly apply it to mortar, concrete and its products, and it can only be used for low-end applications such as road bases. The scale of utilization is small, the economic benefit is poor, and a lot of resources are wasted

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