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Super-high early-strength grouting material for repairing ballastless track structure of high speed railway

A ballastless track, high-speed railway technology, applied in the field of super early strength grouting materials, to achieve the effect of low cost

Active Publication Date: 2012-06-20
四川昊龙高科轨道交通新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, materials used for repairing ballastless track structures of high-speed railways need to have the characteristics of low viscosity, super early strength, low cost, fatigue resistance, aging resistance, water erosion resistance, etc., but some existing materials are difficult to meet the above requirements , there is an urgent need to develop new high-speed railway ballastless track structure repair materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Under the condition of 5~20 ℃, the parts by weight of each component are:

[0026] Ultrafine cement (specific surface area 1000m 2 / kg or more) 100 parts, 50 parts of admixture (30 parts of silica fume, 10 parts of fly ash, 10 parts of quartz powder), redispersible latex powder is 30 parts of vinyl acetate and ethylene copolymer, polymer emulsion is 5 parts of acrylic emulsion, 20 parts of UEA expansion agent (commercially available calcium sulfoaluminate series expansion agent), 1 part of polycarboxylate superplasticizer, 10 parts of sodium aluminate as coagulant, 0.005 parts of rheology additive (carboxymethyl Sodium cellulose and polyurethane emulsion are mixed in a ratio of 1:2), 0.001 part of polyether-siloxane copolymer, and 50 parts of water.

[0027] The performance indicators achieved by the grouting material are: viscosity 2.5Pa s, setting time 25min, 2h compressive strength 12.4MPa, 28d compressive strength 36.6MPa, expansion rate 0.5%, permeability coeffici...

Embodiment 2

[0029] Under the condition that the ambient temperature is 35°C and above, the parts by weight of each component are:

[0030] Ultrafine cement (specific surface area 1000m 2 / kg or more) 100 parts, 50 parts of admixture (20 parts of silica fume, 20 parts of fly ash, 10 parts of quartz powder), redispersible latex powder is 30 parts of vinyl acetate and ethylene copolymer, polymer emulsion is 5 parts of acrylic emulsion, 15 parts of UEA expansion agent, 1.2 parts of polycarboxylate superplasticizer, 5 parts of sodium aluminate as coagulant accelerator, 0.1 part of citric acid as coagulant retarder; 0.005 part of rheology additive (carboxymethyl fiber Sodium plain and polyurethane emulsion are mixed in a ratio of 1:2), 0.001 part of polyether-siloxane copolymer, and 48 parts of water.

[0031] The performance indicators achieved by the grouting material are: viscosity 2.0Pa s, setting time 35min, 2h compressive strength 14.8MPa, 28d compressive strength 32.6MPa, expansion rate...

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Abstract

The invention discloses a super-high early-strength grouting material for repairing a ballastless track structure of a high speed railway, which is prepared by the following steps of: sequentially adding water, polymer emulsion, a water reducing agent, a rheology accessory agent and an antifoaming agent; adding admixture, cement, an expansion agent, a coagulator and a retarder, and stirring and blending the materials at a high speed. The parts by weight of the ingredients are as follows: 100 parts of superfine cement, 50-150 parts of admixture, 25-50 parts of redispersible emulsion powder, 3-10 parts of polymer emulsion, 5-25 parts of expansion agent, 0.1-1.0 part of carboxylic acid water reducing agent, 0.1-10 parts of coagulator, 0.1-5 parts of retarder, 0.001-0.005 parts of rheology accessory agent, 0.001 part of polyether-siloxane copolymer antifoaming agent and 20-70 parts of water. The material disclosed by the invention has the advantages of low viscosity, super-high early-strength, low cost, fatigue resistance, aging resistance and water erosion resistance, and the like, so that the material can be used for repairing the concrete gaps of ballastless tracks of high speed railways, gaps of cement asphalt mortar filling layers, cracks and damages.

Description

technical field [0001] The invention relates to a super-early-strength grouting material for repairing ballastless track structures of high-speed railways, which is suitable for repairing concrete cracks of ballastless tracks of high-speed railways, separation joints, cracks and damages of cement asphalt mortar filling layers. Background technique [0002] In recent years, high-speed railways have developed by leaps and bounds all over the world, especially in my country. As of September 2011, 13,000 km of high-speed railways have been completed in my country. Among the completed high-speed railways, quite a few lines adopt slab-type ballastless track structure. In this type of track structure, concrete cracking and separation and damage of cement asphalt mortar filling layer and track slab become the main damage forms. High-speed trains The dynamic water pressure caused by the coupling of dynamic load and water erosion becomes the main damage source. [0003] The structura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/06
Inventor 曾晓辉王平叶跃忠李固华陈嵘肖杰灵杨彦克潘绍伟
Owner 四川昊龙高科轨道交通新材料科技股份有限公司
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