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Composite cement-based quick-setting dry material and mortar for maintaining ballastless tracks and method for preparing same

A technology of composite cement and slab ballastless track, which is applied in the field of special materials for slab ballastless track maintenance and its production, can solve the problems of long setting time interval, substandard strength, easy shrinkage cracks, etc., and achieves outstanding substantive characteristics and development. Fast and anti-freezing performance

Active Publication Date: 2013-02-13
CHINA RAILWAY 23RD BUREAU GRP RAILTRANSIT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention discloses a new composite cement-based quick-setting dry material and mortar for ballastless track maintenance and a production method thereof. This material solves problems of poor fluidity, long setting time interval, substandard strength and easy The problem of delamination and easy shrinkage cracks

Method used

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  • Composite cement-based quick-setting dry material and mortar for maintaining ballastless tracks and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A composite cement-based quick-setting mortar is prepared by mixing 86% of the dry material and 14% of water in a mass ratio, and the dry material is prepared by mixing 4.5% Portland cement and 25.5% sulfoaluminate in a mass ratio Cement, 7% silica fume, 8% mineral powder, 0.08% retarder, 0.1% defoamer, 0.005% water retaining agent, 0.52% thickener, 0.155% water reducer, 0.05% fiber and 54.09% quartz sand prepared.

Embodiment 2

[0016] A composite cement-based quick-setting mortar is prepared by mixing 85% of the dry material and 15% of water by mass ratio, and the dry material is prepared by mixing 6% Portland cement and 34% sulphoaluminate by mass ratio Cement, 5.2% silica fume, 7.8% mineral powder, 0.078% retarder, 0.104% defoamer, 0.01% water retaining agent, 0.52% thickener, 0.156% water reducing agent, 0.052% fiber and 46.08% quartz sand prepared.

Embodiment 3

[0018] A composite cement-based quick-setting mortar is prepared by mixing 83% of the dry material and 17% of water by mass ratio, and the dry material is prepared by mixing 6.75% Portland cement and 38.25% sulfoaluminate by mass ratio Cement, 4% silica fume, 4% mineral powder, 0.08% retarder, 0.106% defoamer, 0.005% water retention agent, 0.53% thickener, 0.159% water reducer, 0.08% fiber and 46.04% quartz sand prepared.

[0019] The various index performances of the composite cement-based quick-setting mortar of the foregoing embodiment are shown in the table below:

[0020]

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Abstract

The invention relates to a composite cement-based quick-setting dry material for maintaining plate ballastless tracks. The material comprises, by weight, 25% to 45% of composite cement, 7.8% to 15% of composite mineral admixtures, 0.05% to 0.1% of retarders, 0.05% to 0.11% of antifoaming agents, 0% to 0.01% of water-retaining agents, 0.26% to 1% of thickening agents, 0.1% to 0.16% of a water reducing agent, 0.05% to 0.1% of fibers and 46% to 62.5% of quartz sand. The invention further discloses quick-setting mortar which is manufactured by mixing, by weight, 83% to 86% of the dry material and 14% to 17% of water. The invention further discloses a process which comprises steps of material preparation, material mixing, hydration and the like. The composite cement-based quick-setting mortar can achieve gravity grouting, initial and final setting time intervals are short, early strength develops quickly, later strength is not decreased, no water is secreted, no sedimentation exists, the inflation is tiny, the anti-freezing performance is good, obvious contraction does not exist, and the like.

Description

technical field [0001] The invention relates to a special material for maintenance of a slab ballastless track and a production method thereof, in particular to a special composite cement-based quick-setting dry material and mortar for maintenance of a slab ballastless track and a production method thereof. Background technique [0002] At present, my country's high-speed railway mainly adopts ballastless track, which has its own characteristics in the application process. It is different from the flexible structure of traditional ballasted track. The ballastless track bed is a reinforced concrete structure, that is, slab ballastless track bed. The track is a rigid structure, which is relatively susceptible to the impact of changes in the natural environment, such as uneven subsidence of the foundation caused by crustal movement and groundwater movement. At the same time, the use of the track will also cause internal stress damage to the track structure, resulting in cracks in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B22/08C04B24/06C04B103/22
Inventor 潘微旺林晓波张长春
Owner CHINA RAILWAY 23RD BUREAU GRP RAILTRANSIT ENG CO LTD
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