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Improved expansive soil roadbed filling and preparation method thereof

A technology for soil roadbed and expansive soil, applied in the field of roadbed filling, can solve problems such as high cost, pollute the environment, poor effect, etc., and achieve the effects of weakening hydrophilicity, reducing engineering cost, and improving expansion and contraction characteristics.

Active Publication Date: 2017-05-10
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the defects of poor effect, high cost and environmental pollution in the method of improving expansive soil roadbed in the prior art, the present invention provides a kind of improved expansive soil roadbed filler and its preparation method and application. Filler, good improvement effect, obvious and stable expansion improvement, low cost and environmental protection

Method used

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  • Improved expansive soil roadbed filling and preparation method thereof

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preparation example Construction

[0023] The present invention also provides a method for preparing an improved expansive soil roadbed filler, the method comprising: first mixing the expansive soil and slaked lime to form a first mixture, performing second mixing of polyaluminum chloride and water to form a second mixture, The first mixture is then subjected to a third mixing with the second mixture.

[0024] In the present invention, in the present invention, the meaning of the expansive soil is well known to those skilled in the art. According to the evaluation of expansive soil sites in 5.5.2 of the "Special Geotechnical Investigation Regulations for Railway Engineering", free expansion rate ≥ 40%, montmorillonite content ≥ 7%, and cation exchange capacity ≥ 170mmol / Kg can meet any of the two and above are judged as expansive soil.

[0025] In the present invention, the meaning of the polyaluminum chloride is well known to those skilled in the art, and it can be obtained commercially or prepared by convent...

Embodiment approach

[0030] In the present invention, the conditions for the second mixing are not particularly limited, as long as the polyaluminum chloride and water can be uniformly mixed. For example, the conditions for the second mixing include: the temperature may be 5-40° C., and the time may be 0.05-0.25 hours. The second mixing can be performed under stirring. According to a preferred embodiment, the second mixing includes: gradually adding polyaluminum chloride into water until it is completely dissolved.

[0031] In the present invention, the amount of polyaluminum chloride and water used for the second mixing can vary within a wide range. For example, the weight ratio of the polyaluminum chloride to water may be 0.2-0.45:1, preferably 0.3-0.35:1.

[0032] In the present invention, the conditions of the third mixing are not particularly limited, as long as the first mixture and the second mixture can be uniformly mixed. For example, the conditions of the third mixing include: the tem...

Embodiment 1

[0041] This example is used to illustrate the improved expansive soil roadbed filler provided by the present invention and its preparation method

[0042] Take by weighing the expansive soil of 117.4g (dry weight is 100g) and the hydrated lime of 3.06g (dry weight is 3g, and the content of the slaked lime that particle size is greater than 0 less than 0.17mm is 99% by weight, and the content of the slaked lime of 0.17-0.2mm is 1 weight % %), using a forced mixer to stir at a speed of 35 rpm for 30 min at 25° C. and mix uniformly to form the first mixture. Weighed 1.2g of polyaluminum chloride (dry weight: 1.2g), gradually added 3.6g of water under stirring (25°C, 40rpm), stirred for 6min and mixed uniformly to form a second mixture.

[0043] At 25°C, use a sprayer to spray the second mixture at a rate of 200g / min onto the surface of the first mixture under stirring, and continue stirring for 20 minutes after spraying to obtain improved expansive soil roadbed filler A1.

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Abstract

The invention relates to the field of roadbed filling and discloses an improved expansive soil roadbed filling and a preparation method of the improved expansive soil roadbed filling. The improved expansive soil roadbed filling comprises expansive soil, polymeric aluminum and slaked lime. By adopting the improved expansive soil roadbed filling provided by the invention, the improvement effect is good, the improvement on th expansion property is remarkable and stable, and the method is low in cost and is environmentally friendly.

Description

technical field [0001] The invention relates to the field of roadbed filling, in particular to an improved expansive soil roadbed filler, a method for preparing the improved expansive soil roadbed filler, and the improved expansive soil roadbed filler prepared by the method. Background technique [0002] As an important part of the entire transportation system, the roadbed directly bears the long-term effects of the superstructure load and the static and dynamic load of the vehicle, and the quality of the roadbed directly affects the driving speed and driving safety. Therefore, it is necessary to use high-quality roadbed fillers for filling . However, bad subgrade filler expansive soil is widely distributed, and expansive soil has obvious expansion and contraction, over-consolidation and multiple cracks, which brings considerable harm to subgrade construction. When road subgrade construction is carried out on expansive soil sites, the filler in natural sites does not meet t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C3/00
CPCE01C3/003
Inventor 冯杰唐亮惠舒清凌贤长
Owner CHINA SHENHUA ENERGY CO LTD
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