Ballastless track base plate exposed reinforcement repairing material and application thereof

A ballastless track and repair material technology, which is applied in the direction of track, track maintenance, track laying, etc., can solve the problems of secondary cracking, long setting time, high dry shrinkage rate, etc.

Inactive Publication Date: 2019-05-10
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing concrete damage repair materials on the market are generally polymer repair mortars, which have disadvantages such as long setting time, poor adhesion with old concrete, and poor crack resistance. Afterwards, it is prone to the risk of secondary cracking, so the durability is poor

Method used

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  • Ballastless track base plate exposed reinforcement repairing material and application thereof
  • Ballastless track base plate exposed reinforcement repairing material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Weigh 23kg of 52.5-grade aluminate cement, 52kg of 5-20mm natural clean gravel (mud content 0.2wt.%, needle flake particle content 3.0wt.%), 20-70 mesh quartz sand 10kg, silica fume 5kg, 6kg of expansion agent, 2kg of alkali-resistant glass fiber, 1kg of polycarboxylate powdered water reducing agent, 0.2kg of lithium carbonate, 0.3kg of citric acid and 0.5kg of black iron oxide were mixed to obtain the repair material for exposed reinforcement of ballastless track base plate.

[0077] Water was weighed according to the water-to-material ratio of 0.13 and the obtained ballastless track base plate exposed reinforcement repair material was mixed with a forced concrete mixer for 180 seconds to obtain repair concrete slurry.

Embodiment 2

[0079] Weigh 32kg of 52.5-grade sulphoaluminate cement, 31kg of 5-20mm natural clean gravel (0.3wt.% mud content, 2.7wt.% needle-like particle content), 13kg of 20-70 mesh quartz sand, and 6kg of metakaolin , silica fume 1.4kg, expansion agent 7kg, polypropylene fiber 0.4kg, carbon fiber 0.8kg, powdered naphthalene-based superplasticizer 6kg, sodium hydroxide lithium 0.3kg, tartaric acid 0.3kg, boric acid 1kg, iron oxide black 0.3kg and chrome green 0.5kg of copper was mixed to obtain the repair material for the exposed reinforcement of the ballastless track base plate.

[0080] Weigh water and the obtained ballastless track base plate exposed reinforcement repair material according to the water-material ratio of 0.15, and use a forced concrete mixer to stir for 180 seconds to obtain repair concrete slurry.

Embodiment 3

[0082]Weigh 47kg of 42.5-grade sulphoaluminate cement, 22kg of 5-20mm natural clean gravel (mud content 0.4wt.%, needle-like particle content 1.8wt.%), 20-70 mesh quartz sand 19kg, nano-dioxide Mix 4kg of silicon, 2kg of gypsum, 2kg of steel fiber, 2kg of powdered polycarboxylate superplasticizer, 1kg of lithium chloride, 0.5kg of tartaric acid, 0.3kg of chrome black, and 0.2kg of cobalt green to obtain a repair material for exposed reinforcement of the ballastless track base plate.

[0083] Weigh water and the obtained ballastless track base plate exposed reinforcement repair material according to the water-material ratio of 0.17, and use a forced concrete mixer to mix for 180 seconds to obtain repair concrete slurry.

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Abstract

The invention belongs to the field of maintenance of ballastless track maintenance and particularly relates to a ballastless track base plate exposed reinforcement repairing material and application thereof. The ballastless track base plate exposed reinforcement repairing material is made from, by mass, 21-52 parts of cement, 22-62 parts of broken stone, 10-20 parts of quartz sand, 4-18 parts of an enhancer, 2-10 parts of an anti-cracking agent, 0.5-9 parts of a water reducer, 1-2 parts of a toughener, 0-4 parts of a setting time regulator, and 0.5-1 part of a color regulator. The enhancer andthe toughener cooperate with the other components such that a ballastless track base plate repaired with the repairing material herein gains high compressive strength and good durability. The resultsof embodiments show that hardened slurry of the repairing material herein has 28-day compressive strength of 36.8-44.2 MPa, 28-day splitting adhesive strength of 1.8-3.1 MPa, and 28-day dry shrinkageof only -0.01% to 0.02%.

Description

technical field [0001] The invention belongs to the field of ballastless track maintenance, in particular to a ballastless track base plate exposed rib repair material and application thereof. Background technique [0002] Ballastless track refers to the track structure that uses concrete, asphalt mixture, etc. to replace the loose-grained gravel track bed as a whole, and is also called ballastless track. Compared with the ballasted track, the ballastless track avoids splashing ballast, and has the advantages of good ride comfort, good stability, long service life, good durability, less maintenance work, and the train running speed can reach more than 350 kilometers per hour. Ballastless track has been widely used in the construction of high-speed railways in my country because of its advantages such as good smoothness, excellent durability, and less maintenance costs in the later period. The base plate is an important supporting structure of the ballastless track, and its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06E01B29/00C04B111/72
Inventor 王森荣许亮孙立张世杰杨艳丽寇东华娄会彬孙艳裴志勇
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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