High-speed rail ballastless track concrete roadbed slab crack restoration material and preparation and application thereof

A ballastless track and repair material technology, applied in the field of construction engineering, can solve problems such as high cost and complex construction scheme, and achieve the effects of convenient construction, improved chemical medium erosion ability and durability, and super penetration and crystallization ability.

Inactive Publication Date: 2015-10-21
CHINA RAILWAYS CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, these repairs can only achieve short-term effects, and fail to fundamentally effectively solve the long-term durability problem of concrete track bed slabs, and these repair materials have shortcomings such as complex construction schemes and high costs.
Through the literature search of the prior art, there is no relevant material for repairing cracks in the concrete ballast slab of the high-speed rail ballastless track.

Method used

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  • High-speed rail ballastless track concrete roadbed slab crack restoration material and preparation and application thereof
  • High-speed rail ballastless track concrete roadbed slab crack restoration material and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The composition and weight percentage of the material for repairing and maintaining cracks in the concrete ballast slab of the high-speed rail ballastless track of this embodiment are nano-silica: 15%, sodium metasilicate: 4.0%, sodium hydroxide: 1.0%, sodium fluorosilicate: 0.5 %, aluminum silicate: 2.0%, fluorocarbon surfactant: 0.01, sodium tripolyphosphate: 0.5, sodium sulfate: 0.1, deionized water: 76.89%. Trial preparation is carried out by preparing a 100kg sample.

[0030] The first step, take the deionized water of 76.89kg and place it in the reactor, stir, slowly add 15kg nano-silicon dioxide, stir for 15 minutes, then slowly add 4.0kg sodium metasilicate and 1.0kg sodium hydroxide, this time Seal the reactor and maintain the working pressure of the reactor at 21g / cm 2 , the working temperature is 100 ° C, and continue stirring for 15 minutes; stand for observation for 2 hours, remove the pressure and temperature after it is clear, and keep stirring until it ...

Embodiment 2

[0034] The composition and weight percentage of the material for repairing and maintaining cracks in the concrete ballast slab of the high-speed rail ballastless track of this embodiment are nano-silica: 20%, sodium metasilicate: 6.0%, sodium hydroxide: 0.5%, calcium fluorosilicate: 1.0 %, aluminum silicate: 1.5%, fluorocarbon surfactant: 0.05%, sodium tripolyphosphate: 0.2%, sodium sulfate: 0.3%, deionized water: 70.45%. Trial preparation is carried out by preparing a 100kg sample.

[0035] The first step, take 70.45kg of deionized water and place it in the reactor, stir, slowly add 20kg of nano-silicon dioxide, stir for 15 minutes, then slowly add 6.0kg of sodium metasilicate and 0.5kg of sodium hydroxide, this time Seal the reactor and maintain the working pressure of the reactor at 21g / cm 2 , the working temperature is 110 ℃, continue stirring for 10 minutes; stand and observe for 2 hours, remove the pressure and temperature after it is clear, and keep stirring until it c...

Embodiment 3

[0039] The composition and weight percentage of the high-speed rail ballastless track concrete ballast slab crack repair and maintenance material in this embodiment are nano-silica: 17.5%, sodium metasilicate: 5.0%, sodium hydroxide: 0.8%, ferric chloride: 1.0 %, aluminum silicate: 1.5%, fluorocarbon surfactant: 0.03%, sodium tripolyphosphate: 0.3%, sodium sulfate: 0.2%, deionized water: 73.67%. Trial preparation is carried out by preparing a 100kg sample.

[0040] The first step, take the deionized water of 73.67kg and place it in the reactor, stir, slowly add 17.5kg nano-silicon dioxide, stir for 15 minutes, then slowly add 5.0kg sodium metasilicate and 0.8kg sodium hydroxide, this Seal the reactor and maintain the working pressure of the reactor at 21g / cm 2 , the working temperature is 100 ℃, continue to stir for 10 minutes; stand and observe for 1.5 hours, remove the pressure and temperature after it is clear, and keep stirring until it cools to room temperature to obtain...

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Abstract

The invention discloses a high-speed rail ballastless track concrete roadbed slab crack restoration and maintenance material and preparation and application thereof. The restoration material comprises, by weight, 10-20% of nanosilicon dioxide, 4-5% of sodium metasilicate, 1-2% of sodium hydroxide, 1-2% of a cross-linking agent, 0.5-1.0% of a hardening accelerator, 0.01-0.05% of a surface activating agent, 0.2-0.5% of sodium tripolyphosphate, 0.1-0.3% of sodium sulfate, and the balance deionized water. The restoration material can be rapidly condensed and hardened under the drying environment, and has the advantages of high binding power and high permeability, and is convenient to construct, free of toxicity or pollution and capable of achieving rapid restoration and maintenance for a high-speed rail ballastless track concrete roadbed slab.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, and particularly relates to a rapid composite material for cracks in a ballastless track concrete ballast slab of a high-speed rail and a preparation method and application thereof. Background technique [0002] Ballastless track is the main form of high-speed railway track in my country, and its structure is usually composed of reinforced concrete base plate, convex block, CA mortar cushion, track plate, fasteners, rails, etc. In the long-term operation process, due to various factors such as load and natural environment, cracks will appear in the concrete ballast slab as the main bearing structure. When the concrete ballast slab is damaged by cracks, the steel bars in the concrete slab are prone to corrosion, and the corroded steel bars will continue to squeeze and expand the concrete. In the long-term service environment, the concrete will react with carbon dioxide gas in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26C04B14/06C04B22/06C04B22/14C04B22/16C04B111/72
Inventor 陈兵
Owner CHINA RAILWAYS CORPORATION
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