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Cement-based waterproof and crack-resistant material suitable for foundation bed of railroad bed in expansive rock area

A railway subgrade and cement-based technology, which is applied in the field of cement-based waterproof and anti-cracking materials, can solve the problems of increasing the depth of subgrade replacement, increasing construction costs, and rare reports, shortening the construction period, reducing the engineering cost, and reducing The effect of the amount of work

Inactive Publication Date: 2012-06-20
CENT SOUTH UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

Increasing the replacement depth of the foundation bed will greatly increase the construction cost and seriously affect the construction period [6，7]
[0006] Although the research on waterproofing and drainage of subgrade beds in railway construction has been carried out for many years, there are few reports on effective methods for waterproofing subgrade beds in expansive rock areas.

Method used

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  • Cement-based waterproof and crack-resistant material suitable for foundation bed of railroad bed in expansive rock area
  • Cement-based waterproof and crack-resistant material suitable for foundation bed of railroad bed in expansive rock area
  • Cement-based waterproof and crack-resistant material suitable for foundation bed of railroad bed in expansive rock area

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Embodiment

[0041] Wherein the mass ratio of rubber powder particles, polypropylene fiber, emulsified asphalt, latex powder and light calcium carbonate powder in the modified component of the invention example is 1:0.024:0.8:0.06:0.34.

[0042] Taking implementation 3 as an example, the ratio of materials per cubic meter is as follows: (unit: kg / m 3 )

[0043]

[0044] The cement-based waterproof and anti-cracking material of the present invention has undergone standard maintenance for 28 days, and its main properties are: compressive strength (2.0-5.0) MPa, elastic modulus ≤ 2GPa, 56d electric flux ≤ 6000C, typical stress-strain curve figure 2 shown.

[0045] figure 1 The material of the present invention is used in the expansive rock subgrade bed, in the figure: 1-bed surface layer, 2-0.7 (0.6) m thick graded gravel, 3-2.15 (1.75) m thick A, B group filler, 4 -0.10m thick medium-coarse sand (buffer layer), 5-cement-based waterproof and anti-cracking material, 6-surface tre...

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Abstract

The invention discloses a cement-based waterproof and crack-resistant material which is suitable for a foundation bed of a railroad bed in an expansive rock area. The cement-based waterproof and crack-resistant material consists of a gelling material component, a modified component and a sand system, wherein a mass ratio of the gelling material component to the modified component to the sand system is 1:(0.38-0.42):(5.0-5.5). The cement-based waterproof and crack-resistant material has high waterproof performance and elastic deformation performance and is suitable for the foundation bed of the railroad bed in the expansive rock area.

Description

technical field [0001] The invention relates to a cement-based waterproof and anti-cracking material, in particular to a low-strength and high-elasticity waterproof material suitable for preventing surface water seepage from the upper part of a railway subgrade bed in expansive rock areas and capable of withstanding the fatigue effect of train dynamic loads. Background technique [0002] Expansive rock is a special type of soft rock. Its properties are rock-like but not rock-like, soil-like and not soil-like. When its humidity changes, it has a large volume change. When the deformation is restrained, it produces a large internal stress. It has the characteristics of dehydration shrinkage and repeated expansion and contraction deformation, water immersion bearing capacity attenuation, drying shrinkage crack development, etc., and its properties are extremely unstable. The infrastructure projects built on it often have uneven vertical or horizontal expansion and contraction de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
Inventor 龙广成马昆林冯俊德封志军
Owner CENT SOUTH UNIV
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