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A low-temperature repair material for high-speed rail base concrete in severe cold areas and its application

A technology for repairing materials and concrete, applied in the field of building materials, can solve the problems of damage, secondary peeling, low temperature stress resistance, etc., and achieve the effect of simple construction process, high tensile bond strength, and guaranteeing construction quality.

Active Publication Date: 2019-02-01
郑州筑邦建材有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a low-temperature repair material for high-speed rail base concrete in severe cold areas and its application, so as to overcome the problems caused by the low temperature resistance or the inability to withstand the cyclic vibration of the base caused by high-speed train operation Stress damage is prone to secondary spalling

Method used

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  • A low-temperature repair material for high-speed rail base concrete in severe cold areas and its application
  • A low-temperature repair material for high-speed rail base concrete in severe cold areas and its application
  • A low-temperature repair material for high-speed rail base concrete in severe cold areas and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0046] A common low-temperature repair material for high-speed rail base concrete in severe cold regions, the composition of which is as follows:

[0047] 275 parts of 425 ordinary Portland cement, 45 parts of 425 sulfoaluminate cement, 20 parts of waterproof admixture, 30 parts of rubber powder, 630 parts of aggregate, 1.5 parts of water reducing agent, 0.5 parts of construction improver, 0.2 parts of water retaining agent 3.2 parts of early strength agent, 2 parts of nanometer multifunctional hydrophobic agent, 0.5 part of PP fiber.

[0048] The rubber powder is 6011A rubber powder (redispersible latex powder), and the water reducer is water reducer F10.

[0049] The waterproof admixture is dolomite powder; the construction improver is 542 starch ether, the water retaining agent is 400S water retaining agent, the early strength agent is calcium formate, and the PP fiber is 6mm PP fiber.

[0050] The aggregate gradation is as follows:

[0051] Table 1

[0052] Squ...

Embodiment 2

[0064] A fast-hardening low-temperature repair material for high-speed rail base concrete in severe cold regions, the mass parts are as follows:

[0065] 32 parts of 425 ordinary Portland cement, 288 parts of 725 sulfoaluminate cement, 20 parts of waterproof admixture, 30 parts of rubber powder, 630 parts of aggregate, 1.5 parts of water reducing agent, 0.5 parts of construction improver, 0.2 parts of water retaining agent 0 part, 0 part of early strength agent, 2 parts of nanometer multifunctional hydrophobic agent, 0.5 part of PP fiber.

[0066] Further, the rubber powder is a mixture of 5044N rubber powder and 5010N rubber powder with a mass ratio of 1:2, and the water reducer is water reducer F1.

[0067] The waterproof admixture is dolomite powder; the construction improver is 542 starch ether, the water retaining agent is 400S water retaining agent, the early strength agent is calcium formate, and the PP fiber is 6mm PP fiber.

[0068] The aggregate gradation is the sam...

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Abstract

The invention belongs to the technical field of construction materials, and particularly relates to a low-temperature repairing material for a high-speed rail base concrete in a severe cold region and application of the concrete low-temperature repairing material. The low-temperature repairing material comprises the following components: 425 ordinary Portland cement, 425 sulphoaluminate cement, 725 sulphoaluminate cement, a waterproof admixture, rubber powder, an aggregate, a water reducer, a construction improver, a water-retaining agent, an early strength agent, a nano multifunctional water repellent agent, and PP (polypropylene) fiber. The low-temperature repairing material for the high-speed rail base concrete in the severe cold region, provided by the invention, has a repairing construction time meeting a skylight time requirement of a high-speed rail, has compression strength after completion of hydration matching with that of the base concrete, is high in tensile bond strength with the base concrete, is slightly expanded and strong in anti-freezing circulation capability at -40 DEG C, can avoid secondary detachment, and well meets requirements on the low-temperature repairing material for the high-speed rail base concrete in the severe cold region.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a low-temperature repair material for high-speed rail base concrete in severe cold regions and its application. Background technique [0002] The base concrete of the high-speed railway in the severe cold region of Northeast China has been in service for a long time in harsh environments such as low temperature (minimum as low as -40°C) and cyclic vibration of the base caused by the operation of high-speed trains. Freeze-thaw comprehensive diseases often occur, cracks and spalling occur, which seriously affect the train. Operational security requires timely repairs. The current repair method is to chisel the diseased area and scrape the repair materials. However, on the one hand, the conventional repair materials cannot withstand the cycle of freezing and thawing at -40°C in severe cold regions. After repairing, they are not resistant to low temperatures an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/06C04B28/04C04B111/72C04B111/20C04B111/27
CPCC04B28/04C04B28/06C04B2111/20C04B2111/27C04B2111/29C04B2111/72C04B2201/50C04B7/02C04B14/28C04B24/38C04B24/04C04B16/0633C04B14/06C04B2103/46C04B2103/302C04B2103/65C04B2103/0057C04B14/02
Inventor 王再林杨邵举田崇霏崔进文冯如林郭新瑞秦利攀李英男何爽张艳红
Owner 郑州筑邦建材有限公司
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