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High-strength elastic concrete for heavy-haul railway sleepers

An elastic concrete and railway track technology, which is applied in the field of concrete structures, can solve the problems of ballast extrusion and wear, sleeper damage, frequent line maintenance and repair operations, etc., to reduce water consumption, improve early strength, and improve self-compacting The effect on the penetration properties of steel bars

Inactive Publication Date: 2014-12-10
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to heavy-duty trains, ballast extrusion and wear are greatly enhanced, resulting in frequent line maintenance and repair operations, and the tamping operation is also easy to cause the sleeper to be damaged by a large impact force

Method used

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  • High-strength elastic concrete for heavy-haul railway sleepers
  • High-strength elastic concrete for heavy-haul railway sleepers
  • High-strength elastic concrete for heavy-haul railway sleepers

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The high-strength elastic concrete of the heavy-duty railway sleeper in this embodiment is composed of cement, rubber powder, fly ash, silica fume, fine aggregate, coarse aggregate, expansion agent, water reducing agent, defoamer, water and the like. The parts by weight of each component are:

[0022]

[0023] The performance index of fresh concrete is: slump 85mm, apparent density 2410kg / m 3 , no segregation, no bleeding; performance indicators of hardened concrete: concrete steamed at 45°C for 3 days compressive strength 95.8MPa, 28d compressive strength 97.8MPa, 28d flexural strength should be 10.2MPa, ACI 544 impact resistance 5100 times (ACI-544 method), 56d concrete electric flux 150C, 56d concrete frost resistance times (quick freezing method) ≥ F500.

Embodiment 2

[0025] The high-strength elastic concrete of the heavy-duty railway sleeper in this embodiment is composed of cement, rubber powder, fly ash, silica fume, fine aggregate, coarse aggregate, expansion agent, water reducer, defoamer, water and the like. The parts by weight of each component are:

[0026]

[0027]

[0028] The performance index of fresh concrete is: slump 90mm, apparent density 2420kg / m 3 , no segregation, no bleeding; performance indicators of hardened concrete: concrete steamed at 45°C for 3d compressive strength 95.8MPa, 28d compressive strength 98.2MPa, 28d flexural strength should be 10.4MPa, ACI 544 impact resistance 5500 times (ACI-544 method), 56d concrete electric flux 180C, 56d concrete frost resistance times (quick freezing method) ≥ F500.

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Abstract

The invention discloses a high-strength elastic concrete for heavy-haul railway sleepers, which is prepared by mixing and stirring cement, rubber powder and accessories with water. The high-strength elastic concrete for heavy-haul railway sleepers comprises the following components in parts by weight: 100 parts of cement, 3-8 parts of rubber powder, 20-50 parts of pulverized coal ash, 5-20 parts of silica fume, 200-300 parts of fine aggregates, 250-300 parts of coarse aggregates, 5-15 parts of an expanding agent, 1.0-2.0 parts of a water reducing agent, 0.001 part of a defoaming agent, and 40-60 parts of water. The concrete has the advantages of high strength, high anticracking, high impact resistance, high durability and the like, the 3d strength is more than or equal to 95MPa after the concrete is subjected to steam curing at 45DEG C, and the impact resistance times is more than or equal to 3000 (ACI-544 method). The high-strength elastic concrete can be used for heavy-haul railway sleepers and other concrete structures which are subjected to certain serious impact.

Description

technical field [0001] The invention relates to a high-strength elastic concrete used for heavy-duty railway sleepers, which can be used in the manufacture of heavy-duty railway prestressed concrete sleepers, and can also be used in other concrete structures subjected to severe impacts. Background technique [0002] Heavy-haul railways generally refer to trains with a weight of at least 5,000 tons, an axle load of 21 tons or more, and an annual single-track capacity of 20 million tons or more. According to the new standard of the 2005 International Heavy Haulage Association Brazil Annual Conference, heavy haul railways refer to trains with a weight of at least 8000t, an axle load (planned axle load) of 27t and above, and a single-track annual traffic volume of more than 4000 on a line section of at least l50km million t. Heavy-haul railway transportation has been widely valued by railways all over the world because of its large transportation capacity, high efficiency and l...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B18/22C04B18/08
CPCY02W30/91
Inventor 王平曾晓辉颜华肖杰灵林红松陈嵘韦凯洪晓龙付丽霖
Owner SOUTHWEST JIAOTONG UNIV
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