Rubber elastic self-compaction concrete for plate-type ballastless tracks

A technology of slab ballastless track and self-compacting concrete, which is applied in the field of slab ballastless track, can solve the problems of high cost, poor vibration damping performance and impact resistance, and easy cracking of concrete, so as to achieve high energy absorption capacity and improve resistance The effect of compressive strength

Inactive Publication Date: 2014-09-10
SOUTHWEST JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material cost of CA mortar is about 10 times that of ordinary concrete, up to 4,000 yuan/square, and the price of each special mixer truck for CA mortar is high, reaching 3 to 5 million yuan/set. Special machines and tools are required for construction, and motors are required. , mixer and other tooling, and the construction speed is slow (the construction speed is only 300 meters per day for each working surface), the labor cost is high (about 30 people are required for one working surface), and the material and construction costs of a single line add up to 2 million / km, which makes the cost of u

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The parts by weight of each component of rubber elastic self-compacting concrete for a slab ballastless track of the present embodiment are:

[0036] 100 parts of cement

[0037] 8 parts of rubber particles

[0038] 45 parts of fly ash

[0039] 300 parts fine aggregate

[0040] Coarse aggregate 300 parts

[0041] Basalt fiber 2 parts

[0042] Expanding agent 7 parts

[0043] 1.2 parts of water reducer

[0044] Rheological additive 0.02 parts

[0045] 0.001 parts of defoamer

[0046] 60 parts of water

[0047] The performance indicators of fresh concrete are: the time required for the slump cylinder to expand to 500mm is 3s, the expansion degree is 700mm, the height difference of the J ring is 12mm, the time of the L instrument is 8s, and the height ratio of the two sides of the L instrument is 0.92; the hardened concrete performance indicators For: 3d compressive strength 18.0MPa, 28d compressive strength 47.0MPa, fiber reinforced concrete performance test (ACI-5...

Embodiment 2

[0049] The parts by weight of each component of rubber elastic self-compacting concrete for a slab ballastless track of the present embodiment are:

[0050] 100 parts of cement

[0051] 6 parts of rubber particles

[0052] 45 parts of fly ash

[0053] 300 parts fine aggregate

[0054] Coarse aggregate 300 parts

[0055] Basalt fiber 2 parts

[0056] 10 parts of expansion agent

[0057] 1.4 parts of water reducer

[0058] Rheological additive 0.02 part

[0059] 0.001 parts of defoamer

[0060] 55 parts of water.

[0061] The performance indicators of fresh concrete are: the time required for the slump cylinder to expand to 500mm is 3.5s, the expansion degree is 680mm, the height difference of the J-shaped ring is 15mm, the time for the L-shaped instrument is 7s, and the height ratio of the two sides of the "L" instrument is 0.92 The performance index of hardened concrete is: 3d compressive strength 20MPa, 28d compressive strength 48.2MPa, fiber reinforced concrete perf...

Embodiment 3

[0063] The parts by weight of each component of rubber elastic self-compacting concrete for a slab ballastless track of the present embodiment are:

[0064] 100 parts of cement

[0065] 5 parts of rubber particles

[0066] 50 parts of fly ash

[0067] 300 parts fine aggregate

[0068] Coarse aggregate 300 parts

[0069] Basalt fiber 2 parts

[0070] 10 parts of expansion agent

[0071] 1.7 parts of water reducer

[0072] Rheological additive 0.01 part

[0073] 0.001 parts of defoamer

[0074] 50 parts of water.

[0075] The performance indicators of fresh concrete are: the time required for the slump cylinder to expand to 500mm is 4.5s, the expansion degree is 710mm, the height difference of the J-shaped ring is 15mm, the time for the L-shaped instrument is 9s, and the height ratio of the two sides of the "L" instrument is 0.93 The performance index of hardened concrete is: 3d compressive strength 18.9MPa, 28d compressive strength 49.6MPa, fiber reinforced concrete pe...

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Abstract

The invention relates to a rubber elastic self-compaction concrete for plate-type ballastless tracks, which is used for obviously enhancing the compression strength of the self-compaction concrete and enabling the self-compaction concrete to have favorable shock absorption and damping capacities. The rubber elastic self-compaction concrete for plate-type ballastless tracks can be used as a filler between the track plate and the bottom plate in a CRTS III plate-type ballastless track structure, and can also be used as a filler between a switch plate and the bottom plate in a switch structure. The self-compaction concrete is composed of the following components in parts by weight: 100 parts of cement, 4-10 parts of rubber powder, 30-60 parts of mineral admixture, 250-300 parts of fine aggregate, 250-300 parts of coarse aggregate, 1-2 parts of basalt fiber, 5-15 parts of expanding agent, 1.0-2.0 parts of water reducing agent, 0.01-0.05 part of rheologic assistant, 0.001 part of defoaming agent and 40-60 parts of water. The grain fineness of the rubber is 30-50 meshes, and the surface of the rubber is previously treated with polyvinyl alcohol and a silane coupling agent.

Description

technical field [0001] The invention relates to a slab ballastless track, in particular to a rubber-elastic self-compacting concrete used for a CRTSⅢ slab ballastless track, which can be used for the filler between the track slab and the bottom slab, and can also be used for the gap between the turnout slab and the bottom slab in the turnout structure. filler. Background technique [0002] In recent years, high-speed railways have developed by leaps and bounds all over the world, especially in China. By the end of 2013, China had completed and operated 11,000 kilometers of high-speed railways, and 13,000 kilometers of high-speed railways were under construction. In these high-speed railways, a considerable number of lines adopt slab-type ballastless track structure. In this type of track structure, the height of the track slab has been determined, and the error of the floor height is inevitable during construction. Because high-speed railways require extremely high Smoothne...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B16/04
Inventor 曾晓辉张峰许涛赵勇冉华杨波苏伟邓利平张勇陈杭东胡剑华徐军徐荣贵胡宗锋黎建波韩青东李固华
Owner SOUTHWEST JIAOTONG UNIV
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