Controllable low-strength backfill material and preparation method thereof

A low-intensity, basic raw material technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problem of difficult utilization of soil-containing waste, and achieve good recycling, good economic and environmental benefits , the effect of reducing the preparation cost

Active Publication Date: 2021-08-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the waste used in this patent is mainly recycled aggregate obtained after crushing, screening, and sorting of construction waste with high strength, and it is difficult to use soil-containing waste more effectively

Method used

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  • Controllable low-strength backfill material and preparation method thereof
  • Controllable low-strength backfill material and preparation method thereof
  • Controllable low-strength backfill material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] The invention provides a method for preparing a controllable low-strength backfill material, comprising the following steps:

[0026] S1. Mix a predetermined amount of engineering slag, mixing plant waste and sludge, and crush it to a predetermined particle size as the basic raw material;

[0027] S2. Add a predetermined amount of fly ash, cement, water, water reducer and soil dispersant to the basic raw material obtained in step S1, and stir well until the mixture is uniform to obtain a controllable low-strength backfill material.

[0028] In step S1, the particle size of the basic raw material is less than 4.75mm; the mass ratio of the engineering dregs, mixing station waste and sludge is (30-45):(20-30):(10-20).

[0029] In step S2, the mass ratio of the basic raw material to the fly ash, cement, water, water reducer and soil dispersant is (60-75):(5-10):(5-20): (10~25):(0.1~2):(0.1~2).

[0030] The present invention also provides a controllable low-strength backfi...

Embodiment 1

[0038] This embodiment provides a method for preparing a controllable low-strength backfill material, comprising the following steps:

[0039] S1. Mix a predetermined amount of engineering slag, mixing plant waste and sludge, and crush it until the particle size is less than 4.75mm, as the basic raw material;

[0040] S2. Add a predetermined amount of fly ash, cement, water, water reducer and soil dispersant to the basic raw material obtained in step S1, and stir well until the mixture is uniform to obtain a controllable low-strength backfill material.

[0041] In this embodiment, the engineering dregs used are mixed by subway shield spoil, pipeline engineering dregs and roadbed dregs in a mass ratio of 1:1:1, the mixing station waste is concrete mixing station waste, and the sludge is For the sludge from the waterworks, the fly ash is Class I fly ash, the cement is ordinary Portland cement, the water reducer is sulfonated lignin, and the soil dispersant is sodium metasilicate...

Embodiment 2～7 and comparative example 1～2

[0046] Examples 2-7 and Comparative Examples 1-2 respectively provide a controllable low-strength backfill material. Compared with Example 1, the difference is that the amount of each raw material is changed, and the preparation method is consistent with Example 1. , which will not be repeated here. Table 2 shows the mass percentages of each raw material in the controllable low-strength backfill material provided in each embodiment and comparative example.

[0047] Table 2 The mass percent of each raw material in the controllable low-strength backfill material prepared in Examples 2 to 7 and Comparative Examples

[0048]

[0049]

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Abstract

The invention provides a controllable low-strength backfill material and a preparation method thereof. The controllable low-strength backfill material is prepared by adding fly ash, cement, water, a water reducing agent and a soil dispersing agent into a basic raw material and fully and uniformly mixing the mixture, wherein the basic raw material is a mixture of crushed engineering residue soil, mixing plant waste residues and sludge. The prepared controllable low-strength backfill material comprises the following components in parts by weight: 30-45 parts of engineering residue soil, 20-30 parts of mixing plant waste residues, 10-20 parts of sludge, 5-10 parts of fly ash, 5-20 parts of cement, 10-25 parts of water, 0.1-2 parts of a water reducing agent and 0.1-2 parts of a soil dispersing agent. Through the mode, the synergistic effect of all the raw materials can be fully utilized, the utilization rate of waste resources is effectively increased, meanwhile, the backfill material which is high in flow state, self-compacting and controllable in unconfined compressive strength is prepared, and the requirements of practical application are met.

Description

technical field [0001] The invention relates to the technical field of construction waste utilization, in particular to a controllable low-strength backfill material and a preparation method thereof. Background technique [0002] The controllable low-strength backfill material is a kind of cement-based low-strength backfill material with high fluidity, which can be filled by itself without or with a little vibration under the action of its own weight to form a self-compacting structure instead of traditional backfill materials. Its 28d no The confined compressive strength usually does not exceed 8.3MPa. Controllable low-strength backfill material, as a fluid cementitious material that can replace dense soil for backfill, has the characteristics of high fluidity, easy excavation, no subsidence, rapid hardening, low permeability, freeze-thaw resistance, and variable density. Applying it to fields such as backfill engineering, subgrade engineering, pipeline burying engineering...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/16C04B18/04
CPCC04B28/04C04B18/16C04B18/0418C04B2201/50C04B18/08C04B2103/302C04B2103/408Y02W30/91
Inventor 陈友治邓响王云张琴
Owner WUHAN UNIV OF TECH
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