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Preparation method of artificial coarse aggregates based on silty-fine sand matrix

A technology of coarse-grained and fine-grained sand, applied in the field of artificial coarse-grained preparation, can solve the problems of low filler level and poor improvement effect, and achieve the effect of reducing cement consumption, preventing roadbed cracking, and wide application range

Inactive Publication Date: 2018-10-12
CHINA RAILWAY DESIGN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the problem of low filler level and poor improvement effect of silt and fine sand used as roadbed filler in railway subgrade engineering in my country, and invents a fast, economical and efficient method based on silt and fine sand matrix for improving the filler level of silt and fine sand roadbed The preparation method of artificial coarse aggregate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method of the artificial coarse aggregate based on the silty sand matrix mainly includes the following steps:

[0029] 1. Determination of the line grade: Determine the railway line grade according to the railway design requirements, and the railway to be built is a high-speed railway with a speed of 250 kilometers per hour and 300 kilometers of speed-up conditions.

[0030] 2. Determination of the applicable category of subgrade filler: According to the "Code for Design of Railway Subgrade" (TB10001-2016), the optional filler category for the subgrade filler of high-speed railway subgrade is sand, gravel, A and B group fillers in sandy soil, or chemically improved soil , the particle size limit is not more than 60mm, the compaction coefficient is not less than 0.95, and the foundation coefficient K 30 More than 130MPa / m, specify the applicable railway subgrade filler level.

[0031] 3. Artificial coarse aggregate strength grade and gradation requiremen...

Embodiment 2

[0038] On the basis of Example 1, artificial coarse aggregates are produced by mechanical pressing into agglomerates. After mixing the prepared cement mortar, the pressing machine directly presses and forms artificial coarse aggregates with different particle sizes through standard particle size molds. Aggregate, the obtained artificial coarse aggregate is cured to the design strength after 28 days, and finally, according to the subgrade filler gradation requirements, the artificial coarse aggregate with suitable particle size and fine sand are mixed in proportion to form a layered filling Compacted graded packing.

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PUM

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Abstract

The invention discloses a preparation method of artificial coarse aggregates based on a silty-fine sand matrix. The preparation method comprises the following steps: determining the line grade of a railway project under construction; determining the corresponding railway roadbed stuffing grade according to the line grade; determining the strength control index of the artificial coarse aggregates adaptive to the railway roadbed stuffing grade; mixing and uniformly stirring cement and water to form cement slurry, wherein the water and ash mass ratio of the cement slurry is 0.4-1.0, and then mixing the cement slurry with silty-fine sand particles uniformly to form agglomerated cement mortar; and crushing the agglomerated cement mortar and screening particles with the grain size larger than 60mm for crushing again to obtain the artificial coarse aggregates with the grain size smaller than 60mm. The preparation method disclosed by the invention has the beneficial effects that the silty-fine roadbed stuffing grade is improved, the artificial coarse aggregates are blended by making full use of roadbed stuffing in areas along the railway, waste is turned into wealth, the carrying performance and the compaction performance of the stuffing are improved effectively, and the railway project cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of reinforcement and improvement of fillers for bad subgrades of railway engineering, and in particular relates to a method for preparing artificial coarse aggregates based on silty fine sand substrates. Background technique [0002] As of the end of 2016, the total mileage of my country's railway operations reached 120,000 kilometers, which also marks that my country's railway engineering construction and operation have reached a new stage, and high-density coverage of most of the central and eastern regions of my country has been basically achieved. At the same time, there are large areas of deserts in Northwest China and Inner Mongolia and Liaoning in Northeast my country. How to build high-grade railways in desert areas and solve the problems of material selection and quality control of roadbed fillers have always restricted the construction and operation of railways in desert areas. central issue of secu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/12
CPCE02D3/12
Inventor 宋绪国王召祜郭帅杰陈洪运
Owner CHINA RAILWAY DESIGN GRP CO LTD
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