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Fast rush-repair mortar for ballastless track filling layer and preparation method and application thereof

A ballastless track and filling layer technology, applied in the field of building material mortar, can solve the problems of damage and high material prices, and achieve the effects of improving toughness, improving quality and durability, and improving impact resistance

Active Publication Date: 2013-08-28
METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing technology has achieved good repair results for corner damage and small gaps in the filling layer, but the material price is relatively high
However, when the settlement of the roadbed causes large gaps between several or dozens of track slabs and the filling layer or the large-area damage of the filling layer structure caused by emergencies, causing traffic interruption, it is required to do so within 4 hours of the skylight period. Rapid repairs within the country, opening to traffic as soon as possible
Obviously, the mortar in the prior art cannot meet the above requirements, especially for large-area emergency repair of ballastless track filling layer in severe cold areas

Method used

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  • Fast rush-repair mortar for ballastless track filling layer and preparation method and application thereof
  • Fast rush-repair mortar for ballastless track filling layer and preparation method and application thereof
  • Fast rush-repair mortar for ballastless track filling layer and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Example 1 A rapid repair mortar for ballastless track filling layer

[0073] The composition and ratio of raw materials are shown in Table 1.

[0074] Preparation:

[0075] A. Add polymer emulsion, water, defoamer, and water reducing agent into the mortar mixer in sequence, and stir at a slow speed. The stirring speed is 20-40rpm;

[0076] B. Add sand and stir at medium speed, the stirring speed is 60-80rpm;

[0077] C. Add cement, cement expansion mixture, fiber, coagulation regulator, rheology modifier, and air-entraining agent in sequence, and stir rapidly at a stirring speed of 100-140rpm;

[0078] D. Add gas-generating agent about 10 minutes before pouring, stir quickly, and the stirring speed is 100-140rpm;

[0079] E. Stir again at a stirring speed of 100-140rpm for 3-5 minutes, then adjust the stirring speed to 20-40rpm and continue stirring for 1 minute.

[0080] A performance test was carried out on the prepared repair mortar, and the results are shown in...

Embodiment 2

[0081] Example 2 A rapid repair mortar for ballastless track filling layer

[0082] The composition and ratio of raw materials are shown in Table 1.

[0083] Preparation:

[0084] Same as the preparation method described in Example 1.

[0085] A performance test was carried out on the prepared repair mortar, and the results are shown in Table 2.

Embodiment 3

[0086] Example 3 A rapid repair mortar for ballastless track filling layer

[0087] The composition and ratio of raw materials are shown in Table 1.

[0088] Preparation:

[0089] F. Mix cement, cement expansion mixture, sand, air-generating agent, fiber, rheology modifier, and coagulation regulator uniformly to obtain dry powder;

[0090] G. Add the polymer emulsion, water, water reducer and defoamer into the mortar mixer in sequence, and stir at a slow speed, the stirring speed is 20-40rpm;

[0091] H. First add the dry powder obtained in step F, and finally add the air-entraining agent, stir at a medium speed, and the stirring speed is 60-80rpm;

[0092] I. After the feeding is finished, stir rapidly for 3 to 5 minutes at a stirring speed of 100 to 140 rpm, then adjust the stirring speed to 20 to 40 rpm and continue stirring for 1 minute to obtain final product.

[0093] A performance test was carried out on the prepared repair mortar, and the results are shown in Tabl...

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Abstract

The invention discloses fast rush-repair mortar for a ballastless track filling layer and a preparation method and an application thereof. The fast rush-repair mortar comprises the following components in parts by mass: 0.95-0.99 part of cement, 0.01-0.05 part of cement expansion admixture, 0.001-0.0025 part of fiber, 0.35-1.4 parts of macromolecular emulsion, 1.5-2 parts of sand, 0.001-0.005 part of thickening time control agent, 0.0004-0.01 part of antifoaming agent, 0.0001-0.003 part of gas forming agent, 0-0.01 part of air entraining agent, 0-0.02 part of water reducing agent, 0-0.001 part of rheology modifier and 0-0.3 part of water, wherein the cement and the cement expansion admixture account for 1 part in total. The rush-repair mortar disclosed by the invention has the advantages of fast setting and early strength and excellent thermal adaptability and application property, and guarantees recovery of railway operation in a skylight period of 4 hours in a severe cold area.

Description

technical field [0001] The invention belongs to the field of building material mortar, and in particular relates to a rapid repair mortar for a slab ballastless track filling layer and its preparation method and application, especially the application in repairing the slab ballastless track filling layer in severe cold regions. Background technique [0002] Slab ballastless track is one of the main structural forms of high-speed railway ballastless track. Its structural feature is to lay a concrete base on the subgrade, place a prefabricated track slab on the base, reserve a gap of 3 to 5 cm between the two, and pour Cement-emulsified asphalt mortar forms a uniform filling layer with both rigidity and elasticity after curing. In the slab ballastless track structure, compared with the high-strength concrete track slab and concrete base, the filling layer formed by the curing of cement emulsified asphalt mortar becomes the weak link in the structure. In recent years, slab bal...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B28/06
Inventor 李海燕贾恒琼邵丕彦吴韶亮李洪刚王涛魏曌刘子科
Owner METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI
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