Coal ash soil composite material for highway subgrade and preparation method thereof

A composite material and fly ash technology, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve problems such as easy liquefaction of pure fly ash, unsatisfactory effect, unstable roadbed, etc., to achieve Good liquefaction resistance, obvious social and economic benefits, and low price

Inactive Publication Date: 2008-10-29
JILIN UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Frost heaving and slurrying are mainly caused by the instability of the subgrade. Although there are some methods to prevent and control the freezing damage of roads in seasonally frozen regions, such as filling the subgrade of roads in cold regions with fly ash, pure fly ash is easy to liquefy and the effect is not ideal.

Method used

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  • Coal ash soil composite material for highway subgrade and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: 28.3% of fly ash is mixed with 71.7% of the soil that is dried, crushed and sieved, and in the mixed fly ash soil, it is 0.5% by mass of polypropylene fiber, the Stir the fiber and fly ash soil evenly, add water to prepare the water content to 18%, make a test piece, and let it stand in a humidifier for 24 hours. Its unconfined compressive strength was measured to be 0.34MPa.

Embodiment 2

[0023] Embodiment 2: the fly ash of 38.3% is mixed with the soil of 61.7% through drying, crushing and sieving, and in the fly ash soil after mixing, it is 1% polypropylene fiber by mass percentage, and the Stir the fiber and fly ash soil evenly, add water to prepare the water content to 23%, make a test piece, and let it stand in a humidifier for 24 hours. Its unconfined compressive strength was measured to be 0.47MPa.

Embodiment 3

[0024] Embodiment 3: 33.3% fly ash is mixed with 66.7% of the soil that is dried, crushed and sieved, and in the mixed fly ash soil, it is 2% by mass of polypropylene fiber, and the Stir the fiber and fly ash soil evenly, then add water to prepare the water content to 22%, make a test piece, and let it stand in a humidifier for 24 hours. Its unconfined compressive strength was measured to be 0.35MPa.

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Abstract

The invention relates to a fly ash and soil composite material used in highway roadbed and is characterized in that the material consists of fly ash, soil and polypropylene fiber; the technique is simple and reliable to ensure that the fly ash and soil composite material has good frost resistance property; the unconfined compressive strength of the fly ash and soil which is doped with the polypropylene fiber is 1.26 to 1.74 times higher than the unconfined compressive strength of pure fly ash and soil. According to the characteristics of roadbed freezing injury mechanism and structural style in seasonal frozen areas, the fly ash and soil composite material of the invention adopts novel materials which have the advantages of good resistance to freezing and thawing, high strength, low cost and environmental protection as the roadbed filler, which not only has theoretical guidance meaning, but also has direct practical meaning for solving engineering problems.

Description

technical field [0001] The invention relates to a fly ash-soil composite material for highway subgrades in seasonally frozen regions. A reinforcing material is added to the fly ash soil to ensure good freeze-thaw resistance of the fly ash soil and improve the liquefaction resistance of the fly ash soil. increase its compressive strength. Background technique [0002] Through the field investigation of Changping, Changji, Changying and Jijiang Expressways and Yingbai Secondary Highway in Jilin Province in recent years, as well as the Shenda, Shenshan and Shenben Expressways in Liaoning Province, Heilongjiang Province According to the investigation report on frost damage conducted on Harbin-Dalian Expressway and Ha-Sui Highway, it was found that road frost damage in seasonally frozen areas is very serious. The situation of frost damage is manifested as: using frost-heaving soil and road sections with poor hydrogeological conditions, under the action of negative winter tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/08C04B16/06
CPCC04B2111/29C04B28/001C04B2111/0075C04B2111/00017Y02W30/91C04B16/0633C04B18/08
Inventor 刘寒冰魏海斌程永春李长雨
Owner JILIN UNIV
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