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Modifier for high-water-content clay filler and roadbed filling construction method

A technology with high moisture content and construction method, applied in soil protection, soil conditioning materials, infrastructure engineering and other directions, can solve the problems of difficult packing, low strength, large deformation of roadbed, etc., to improve the strength performance of roadbed, improve Dry shrinkage performance, good effect of improving performance

Active Publication Date: 2020-09-22
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the Sichuan-Tibet Railway and the southern and coastal areas, the desirable filler is generally high moisture content clay filler, but the filler with high moisture content is difficult to compact, and the subgrade deformation is large after compaction, which cannot meet the structural performance requirements of the subgrade and pavement , often lacking drying conditions, requiring special modification
[0003] At present, the conventional chemical improvement method of adding cement, lime and other materials to the filler is commonly used to improve the high moisture content clay filler, but the conventional improvement method still has low strength, it is difficult to mix evenly, it is easy to crack, and it is not easy to compact, etc. Problems, can not meet the requirements of subgrade and pavement structural performance, need to carry out targeted special improvement technology

Method used

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  • Modifier for high-water-content clay filler and roadbed filling construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The composite improver for high moisture content clay filler described in this example is composed of cement and improver mixed in a mass ratio of 100:3.

[0051] Wherein, according to the calculation in parts by mass, the modifier consists of the following components:

[0052] 10 parts of sodium nitrate, 70 parts of sodium carbonate, 60 parts of sodium sulfate, 120 parts of calcium oxide, 45 parts of silicon fume, 40 parts of magnesium oxide, 100 parts of fine sand, 60 parts of cement; among them, the cement is ordinary Portland cement, the strength No grade lower than 42.5.

[0053] A high moisture content clay filler subgrade filling construction method, comprising the following steps:

[0054] S1. The preparation of composite improver, specifically:

[0055] S101. Mix sodium nitrate, sodium carbonate, sodium sulfate, calcium oxide, silica fume, magnesium oxide, fine sand, and cement according to the above-mentioned selected parts by mass, and stir evenly to obtain...

Embodiment 2

[0070] The composite improver for high moisture content clay filler described in this example is composed of cement and improver mixed in a mass ratio of 100:5.

[0071] Wherein, according to the calculation in parts by mass, the modifier consists of the following components:

[0072] 30 parts of sodium nitrate, 60 parts of sodium carbonate, 70 parts of sodium sulfate, 110 parts of calcium oxide, 40 parts of silicon fume, 50 parts of magnesium oxide, 120 parts of fine sand, and 50 parts of cement.

[0073] The construction method of filling the roadbed with high moisture content clay filler described in this embodiment is the same as that in Embodiment 1.

Embodiment 3

[0075] The composite improver for high moisture content clay filler described in this example is composed of cement and improver mixed in a mass ratio of 100:1.

[0076] Wherein, according to the calculation in parts by mass, the modifier consists of the following components:

[0077] 20 parts of sodium nitrate, 80 parts of sodium carbonate, 80 parts of sodium sulfate, 100 parts of calcium oxide, 50 parts of silicon fume, 30 parts of magnesium oxide, 110 parts of fine sand, and 55 parts of cement.

[0078] The construction method of filling the roadbed with high moisture content clay filler described in this embodiment is the same as that in Embodiment 1.

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Abstract

The invention provides a modifier for a high-water-content clay filler and a roadbed filling construction method. The modifier comprises the following components in parts by mass: 1 to 50 parts of sodium nitrate, 30 to 150 parts of sodium carbonate, 30 to 150 parts of sodium sulfate, 50 to 200 parts of calcium oxide, 20 to 100 parts of silicon powder, 10 to 100 parts of magnesium oxide, 50 to 200parts of fine sand and 20 to 100 parts of cement. The modifier has the micro-expansion characteristic, the air shrinkage performance of the filler can be improved, and cracking is prevented; comparedwith a roadbed constructed through a traditional improvement method, the roadbed constructed through the construction method is higher in compressive strength, small in frost heaving rate and low in permeability coefficient, and the roadbed and pavement structure performance requirements are met.

Description

technical field [0001] The invention belongs to the technical field of roadbed construction, and in particular relates to an improver for high moisture content clay filler and a roadbed filling construction method. Background technique [0002] The subgrade is a belt-shaped structure built according to the route position and certain technical requirements as the foundation of the road surface. The subgrade is the foundation of railways and highways. It not only bears the weight of the track structure, that is, the static load, but also bears the dynamic load transmitted through the track when the train is running. Therefore, the subgrade should have sufficient firmness, stability and durability. . Considering the demand of environmental protection and reducing the amount of mountain excavation, the construction filler of the roadbed usually adopts the method of local materials, and the roadbed filler is selected locally for roadbed construction. However, for the Sichuan-Ti...

Claims

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Application Information

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IPC IPC(8): C09K17/10E01C3/04E02D3/12C09K103/00
CPCC09K17/10C09K2103/00E01C3/04E02D3/12E02D3/123E02D3/126E02D2300/0045
Inventor 陈锋王仲锦曾帅张栋邓逆涛张千里闫宏业
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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