Self-compacting concrete for rapid transit railway III-type plate ballastless tracks and preparation method of self-compacting concrete

A technology of slab ballastless track and self-compacting concrete, which is applied in the preparation of self-compacting concrete and the field of self-compacting concrete, can solve the problems of affecting the service life, short development time, and non-adhering joints, etc., and achieves high production efficiency and flow performance. Good, low shrinkage effect

Inactive Publication Date: 2012-03-28
中铁八局集团第四工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Slab ballastless track is a structural form of high-speed railway. The filling material between the track slab and the base is one of the core technologies of slab ballastless track. Type III slab ballastless track is a ballastless track with complete intellectual property rights in my country. The technology has been used in

Method used

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  • Self-compacting concrete for rapid transit railway III-type plate ballastless tracks and preparation method of self-compacting concrete
  • Self-compacting concrete for rapid transit railway III-type plate ballastless tracks and preparation method of self-compacting concrete
  • Self-compacting concrete for rapid transit railway III-type plate ballastless tracks and preparation method of self-compacting concrete

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preparation example Construction

[0012] The above-mentioned preparation method for the self-compacting concrete of Type III slab ballastless track of high-speed railway comprises the following steps:

[0013] ① Prepare raw materials according to the ratio;

[0014] ②Put the stones and sand in the raw materials into the mixer and stir for 120 seconds;

[0015] ③Continue to add cement, fly ash, mineral powder, expansion agent, thickener and shrinkage reducer in the raw materials and stir for 60 seconds;

[0016] ④ Add water reducing agent, slump retaining agent and water and stir for 150 seconds.

Embodiment 1

[0018] Prepare raw materials according to the following mixing ratio (parts by weight):

[0019] 100 parts of ordinary silicate 425# cement, 11 parts of expansion agent, 38.5 parts of fly ash, 20.5 parts of mineral powder, 261 parts of sand with a fineness modulus of 2.3-2.5, 251 parts of stones with a particle size of 5-10mm, and expansion agent 11 parts, 0.04 parts of thickener, 56 parts of water, 1.3 parts of shrinkage reducing agent, 2.3 parts of water reducing agent, 0.37 parts of slump retaining agent.

[0020] Preparation process: Add the stone and sand in the raw material to the mixer and stir for 120 seconds, then add the cement, fly ash, mineral powder, expansion agent, thickener, and shrinkage reducer in the raw material and stir for 60 seconds, and finally add the water reducer and slump retaining agent Stir with water for 150 seconds.

[0021] The main performance indicators are shown in the table below:

[0022]

Embodiment 2

[0024] Prepare raw materials by following proportioning (parts by weight):

[0025] 100 parts of ordinary silicate 425# cement, 11 parts of expansion agent, 38.5 parts of fly ash, 20.5 parts of mineral powder, 277 parts of sand with a fineness modulus of 2.6-2.8, 235 parts of stones with a particle size of 5-10mm, and expansion agent 11 parts, 0.04 parts of thickener, 60 parts of water, 1.3 parts of shrinkage reducing agent, 2.3 parts of water reducing agent, 0.37 parts of slump retaining agent.

[0026] Preparation process: Add the stone and sand in the raw material to the mixer and stir for 120 seconds, then add the cement, fly ash, mineral powder, expansion agent, thickener, and shrinkage reducer in the raw material and stir for 60 seconds, and finally add the water reducer and slump retaining agent Stir with water for 150 seconds.

[0027] The main performance indicators are shown in the table below:

[0028]

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Abstract

The invention discloses a self-compacting concrete for rapid transit railway III-type plate ballastless tracks and a preparation method of the self-compacting concrete. The self-compacting concrete can effectively eliminate bleeding in a pouring process, has low contractibility rate and good durability, and is beneficial to improving of pavement quality of track plates and prolonging of service life of the ballastless tracks. The self-compacting concrete is prepared by stirring and mixing cement, sand, stone, an expanding agent, a water reducing agent, a shrinkage reducing agent, a thickening agent, a water reducing agent, a collapse preventing agent and water as raw materials, wherein the raw materials comprise the following components in parts by weight: 100 parts of common silicate 425# cement, 11 parts of an expanding agent, 38.5 parts of coal ash, 20.5 parts of mineral powder, 261-277 parts of sand with fineness modulus of 2.4-2.8, 235-251 parts of stone with a grain size of 5-10mm, 0.04 part of a thickening agent, 56-60 parts of water, 1.3 parts of a shrinkage reducing agent, 2.3 parts of a water reducing agent and 0.37 part of a collapse preventing agent.

Description

technical field [0001] The invention relates to high-speed railways, in particular to a self-compacting concrete used for type III slab ballastless tracks of high-speed railways, and a preparation method of the self-compacting concrete. Background technique [0002] In the Type III slab ballastless track system of the high-speed railway, after the track slab is discharged and fine-tuned by the calibration system, there is a 10cm space between the track slab and the hydraulic concrete bearing layer (HGT), and the flow performance of self-compacting concrete is used to ensure this space Completely filled, play the role of force transmission. Self-compacting concrete is made of cement, sand, gravel, expansion agent, water reducer, shrinkage reducer, thickener, water reducer, slump retaining agent and water as raw materials, and is made by special process stirring at room temperature. It uses water reducing agent to improve the fluidity of concrete, uses slump retaining agent t...

Claims

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Application Information

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IPC IPC(8): C04B28/04
Inventor 赵勇尚宗康许涛叶昌林倪俊黄跃东邱长军冉华徐荣贵
Owner 中铁八局集团第四工程有限公司
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