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Quick repair mortar for high-speed railway concrete track slab and preparation method thereof

A high-speed railway and repair mortar technology, which is applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of low 28d strength, harsh construction environment requirements, poor repair interface stress, etc.

Active Publication Date: 2020-08-14
METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The cost of the material is high, the requirements for the construction environment are harsh, and the process is complicated
At the same time, the resin material has poor aging resistance and durability
Moreover, there are large differences in the temperature sensitivity and stress-strain response of inorganic-organic materials, so it is easy to form a stress difference at the repair interface, resulting in cracks or even falling off between the repair material and the track plate substrate. Difficult-to-maintain durability
Chinese invention patent CN101560077A discloses an epoxy resin mortar composition applied to slab ballastless track. The mortar has the characteristics of heat aging resistance, chemical corrosion resistance, elasticity and mechanical strength to cement, but the raw material preparation process is relatively complicated. , the mixing time is long, which cannot better meet the requirements of rapid construction and repair of high-speed rail ballastless tracks. The epoxy resin mortar composition in this patent does not involve hourly strength, and its 28d strength is low

Method used

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  • Quick repair mortar for high-speed railway concrete track slab and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1 A quick repair mortar for high-speed railway concrete track slab

[0049] Quick repair mortar raw material and mass parts thereof in the present embodiment are as shown in table 1; Wherein,

[0050] The cement is grade 52.5 rapid-hardening sulfoaluminate cement; the mineral admixture is grade I fly ash; the fine aggregate is machine-made sand with continuous particle gradation of 40 mesh to 120 mesh; Plastic expansion agent and UEA expansion agent; plastic agent is hydroxypropyl methylcellulose ether; water reducer is polycarboxylate water reducer; early strength agent is lithium carbonate; retarding component is tartaric acid with a mass ratio of 1:1 and boric acid; the soluble rubber powder is acrylate and styrene copolymer powder (mass ratio 1:1); the defoamer is a silicone defoamer; the toner is carbon black; the polymer emulsion is an improved solid content of 48%. Non-toxic acrylic emulsion.

[0051] The quick repair mortar is prepared by the followin...

Embodiment 2

[0053] Example 2 A quick repair mortar for high-speed railway concrete track slab

[0054] The rapid repair mortar raw materials and mass parts thereof in the present embodiment are as shown in Table 1, wherein:

[0055] The cement is 52.5 grade rapid hardening sulfoaluminate cement and superfine Portland cement with a mass ratio of 4:1; the mineral admixture is silica fume and Class I fly ash with a mass ratio of 2:3; the fine aggregate is water-containing 40 mesh to 120 mesh river sand with a ratio of 0.1%; the expansion component is 200 mesh scale aluminum powder with a mass ratio of 1:2:12, plastic expansion agent and UEA expansion component; the plastic agent is hydroxypropyl methylcellulose plain ether; the water reducer is polycarboxylate water reducer; the early strength agent is lithium carbonate and calcium formate with a mass ratio of 1:10; the retarding component is tartaric acid and citric acid with a mass ratio of 1:1; the soluble rubber powder is Acrylate and...

Embodiment 3

[0058] Example 3 A quick repair mortar for high-speed railway concrete track slab

[0059] The rapid repair mortar raw materials and mass parts thereof in the present embodiment are as shown in Table 1, wherein:

[0060] The cement is 42.5 grade rapid-hardening sulfoaluminate cement; the mineral admixture is silica fume; the fine aggregate is 40-120 mesh river sand with a moisture content of 0.1%; the expansion component is a plastic expansion agent with a mass ratio of 1:12 and UEA expansion component; the plasticizer is modified starch and hydroxypropyl methylcellulose ether with a mass ratio of 1:1; the water reducer is polycarboxylate water reducer; the early strength agent is lithium hydroxide; Borax and citric acid are divided into 2:1; the defoamer is a silicone defoamer; the toner is carbon black; the polymer emulsion is a modified acrylic emulsion with a solid content of 48%.

[0061] The quick repair mortar is prepared by the following method:

[0062] After the ...

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Abstract

The invention provides quick repair mortar for a high-speed railway concrete track slab. The quick repair mortar comprises, by mass, 100 parts of cement, 50 to 250 parts of fine aggregate, 5 to 25 parts of a mineral admixture, 0 to 8 parts of soluble latex powder, 0 to 20 parts of a polymer emulsion, 0.1 to 1.0 part of a water reducing agent, 0.2 to 2.0 parts of an expansion component, 0.1 to 1.5parts of a plasticizer, 0.1 to 1.2 parts of an early strength agent, 0.2 to 1.5 parts of a retarding component, 0.1 to 0.5 part of a defoaming agent and 0 to 30 parts of water. The mass parts of the soluble latex powder and the polymer emulsion are not 0 at the same time. The invention further provides a preparation method of the quick repair mortar and an application of the quick repair mortar innon-structural damage repair of ballastless high-speed railway concrete track slabs. The quick repair mortar has the characteristics of good workability, early strength, high strength, high volume stability, good durability and the like.

Description

technical field [0001] The invention belongs to the field of concrete and railway building materials, and in particular relates to a mortar for rapid repair of high-speed railway concrete track slabs and a preparation method thereof. Background technique [0002] The slab ballastless track is one of the main track structures of high-speed railways in my country, with prefabricated track slabs as the core of the structure. Prefabricated track slabs can be mainly divided into CRTSI type, CRTSII type and CRTSIII type. As of 2019, the total mileage of my country's high-speed railways has exceeded 30,000 kilometers, and the number of concrete track slabs on the railway line has reached nearly 10 million. As the operating time increases, the number of damaged track slabs also increases. When non-structural damage such as local fragmentation, falling blocks, and honeycomb pitting occurs on the track slab that affects operational safety and durability, it is necessary to repair th...

Claims

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Application Information

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IPC IPC(8): C04B28/06C04B24/26C04B111/72
CPCC04B28/06C04B2201/50C04B2111/72C04B2103/0053C04B18/08C04B14/06C04B2103/0068C04B24/383C04B2103/302C04B22/10C04B24/06C04B22/0013C04B24/26C04B24/2611C04B24/42C04B14/022C04B7/02C04B18/146C04B22/04C04B24/04C04B24/38C04B22/062Y02W30/91
Inventor 吴韶亮李海燕贾恒琼魏曌张恒王涛杜玮张琪王炳岩
Owner METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI
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