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Improved expansive soil, and preparation method, construction method and application thereof

A construction method and technology of expansive soil, applied in the field of improving expansive soil and its preparation

Active Publication Date: 2020-05-12
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems, the present invention provides an improved expansive soil and its preparation method, construction method and application, which can effectively solve the problem of subgrade damage caused by expansion and contraction deformation of expansive soil and improve the strength of expansive soil, which is easy to popularize

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  • Improved expansive soil, and preparation method, construction method and application thereof
  • Improved expansive soil, and preparation method, construction method and application thereof
  • Improved expansive soil, and preparation method, construction method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The improved expansive soil of preparation 2kg, the preparation method of improved expansive soil is as follows:

[0027] (1) take by weighing 1.68kg expansive soil according to the proportioning ratio of 84%, take by weighing lithium slag according to the 12% lithium slag dosage according to the proportioning ratio, and take by weighing NaOH according to the 4% alkali dosage according to the proportioning ratio 80g;

[0028] (2) After the above-mentioned materials are mixed evenly, according to the "Highway Soil Test Regulations" JTG E40-2007 medium-heavy compaction test, the optimal water content is 20%, that is, add 0.4kg of water and stir evenly;

[0029] (3) After 2 days of stuffing under natural conditions, the improved expansive soil can be obtained.

[0030] Among them, the analysis results of lithium slag are, in terms of the mass percentage of the oxides obtained after analysis and detection: 52.13% of silicon dioxide, 17.25% of aluminum oxide, 13.32% of calc...

Embodiment 2

[0041] The improved expansive soil of preparation 2kg, the preparation method of improved expansive soil is as follows:

[0042] (1) Take by weighing 1.64kg of expansive soil according to the proportioning ratio of 82%, take by weighing 0.28kg of lithium slag according to the 14% lithium slag dosage according to the proportioning, and take by weighing NaOH 80g according to the 4% alkali dosage according to the proportioning ratio ;

[0043] (2) After the above-mentioned materials are mixed uniformly, according to the "Highway Geotechnical Test Regulations" JTG E40-2007 medium-heavy compaction test, the optimal water content is 22%, that is, add 0.44kg of water and stir evenly;

[0044] (3) After 2 days of stuffing under natural conditions, the improved expansive soil can be obtained.

[0045] Among them, the analysis results of lithium slag are, in terms of the mass percentage of the oxides obtained after analysis and detection: 52.13% of silicon dioxide, 17.25% of aluminum o...

Embodiment 3

[0055] The improved expansive soil of preparation 2kg, the preparation method of improved expansive soil is as follows:

[0056] (1) Take by weighing 1.60kg of expansive soil according to the proportioning ratio of 80%, take by weighing 0.32kg of lithium slag according to the 16% lithium slag dosage according to the proportioning, and take by weighing NaOH 80g according to the 4% alkali dosage according to the proportioning ratio ;

[0057] (2) After the above-mentioned materials are mixed evenly, according to the "Highway Soil Test Regulations" JTG E40-2007 medium-heavy compaction test, the optimal water content is 25%, that is, add 0.5kg of water and stir evenly;

[0058] (3) After 2 days of stuffing under natural conditions, the improved expansive soil can be obtained.

[0059] Among them, the analysis results of lithium slag are, in terms of the mass percentage of the oxides obtained after analysis and detection: 52.13% of silicon dioxide, 17.25% of aluminum oxide, 13.32%...

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Abstract

The invention relates to improved expansive soil, and a preparation method, a construction method and application thereof. The improved expansive soil comprises 12-16% by mass of lithium slag, 4% by mass of alkali and 80-84% by mass of expansive soil of a to-be-improved soil body, and the improved expansive soil is formed by uniformly mixing the lithium slag, the alkali and the expansive soil. According to the invention, the waste lithium slag is used for improving the expansive soil under the condition of alkali doping, so engineering cost is saved, the lithium slag is reutilized, environmentis protected, and a novel improvement method is developed for reducing engineering disasters caused by expansive soil; the waste lithium slag is added as coarse aggregate to function as a skeleton effect and to improve mixture gradation, and can be uniformly distributed in the expansive soil, so excellent physical performance is obtained and physical improvement is realized; and the improved expansive soil is substantially reduced in expansibility, cracks caused by a dry-wet cycle can be eliminated, water stability can be improved, and strength required by engineering can be met.

Description

technical field [0001] The invention belongs to the technical field of foundations, and in particular relates to an improved expansive soil and its preparation method, construction method and application. Background technique [0002] Expansive soil is a kind of special clay with extremely poor engineering properties. Because it contains hydrophilic minerals such as montmorillonite, illite and kaolin, this makes expansive soil have poor engineering properties such as water swelling deformation and dehydration shrinkage cracking. my country's expansive soil covers a very wide area, mainly distributed in North China, Central China, East China and Southwest China, and also a small amount in Northeast China and South China. The building area damaged by expansive soil exceeds 10km2 every year, causing serious economic losses. [0003] Therefore, effective treatment of expansive soil is of great significance for engineering construction. At present, there are mainly replacement ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/08E01C3/04E02D3/12C09K103/00
CPCC09K17/08C09K2103/00E01C3/04E02D3/123
Inventor 孙树林丁伟吴孙星李思远杨通政
Owner HOHAI UNIV
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