Slab ballastless track wide-narrow joint quick repair polymer concrete and preparation method thereof

A technology of slab ballastless track and polymer, which is applied in the field of ballastless track building materials, can solve the problems of slow hardening, poor durability, and low cohesive force, and achieve the effects of fast hardening, good bonding ability, and small drying shrinkage

Inactive Publication Date: 2020-01-10
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at at least one of the above defects or improvement needs of the prior art, the present invention provides a polymer concrete for rapid repair of wide and narrow joints of CRTSII slab ballastless track, which overcomes the slow hardening, low cohesive force and poor durability

Method used

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preparation example Construction

[0055] In order to achieve the above object, according to another aspect of the present invention, there is also provided a kind of preparation method of polymer concrete for rapid repair of wide and narrow joints of CRTSII type slab ballastless track as described above, comprising the steps of:

[0056] A. Weigh cement, fly ash, gravel, sand, expansion agent, water reducer, coagulant, retarder and concrete modifier according to the weight ratio as mentioned above, and put them in a mixer to mix them evenly , the stirring time is controlled at 15-60 seconds;

[0057] B. Add water weighed according to the weight ratio as mentioned above to the stirred product obtained in step A, and continue stirring for 30-120 seconds to obtain the polymer concrete.

Embodiment 1

[0059] Take 50 parts by weight of sulfoaluminate cement; 5 parts by weight of fly ash; 50 parts by weight of pebbles with a particle size of 5-16mm; 20 parts by weight of river sand with a fineness modulus of 2.4-3.1; 10 parts of U-shaped expansion agent; 5 parts by weight of carboxylic acid water reducing agent; 1.2 parts by weight of polyacrylamide as concrete modifier.

[0060] The above-mentioned ingredients were weighed and transferred to a mixer, and stirred uniformly for 60 seconds; then 20 parts by weight of water was added, and the stirring was continued for 60 seconds to obtain the high-performance polymer concrete of the present invention. Its compressive strength is tested according to the compressive strength test method in GB / T 50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete". The method for measuring the bonded splitting tensile strength of concrete was tested, and the shrinkage rate (28d) was measured according to the shrinka...

Embodiment 2

[0062] Take 40 parts by weight of sulfoaluminate cement; 18 parts by weight of PO52.5 ordinary silicate; 7 parts by weight of fly ash; 45 parts by weight of pebbles with a particle size of 5-16mm; 15 parts of calcium sulfoaluminate expansion agent; 8 parts by weight of powdered polycarboxylate superplasticizer; 0.5 parts by weight of coagulant lithium carbonate; 0.5 parts by weight of retarder boric acid, and 1.5 parts by weight of concrete modifier latex powder.

[0063] The above-mentioned ingredients are weighed and transferred to a mixer, and stirred uniformly for 60 seconds; then 15 parts by weight of water are added, and the stirring is continued for 30 seconds to obtain the high-performance polymer concrete of the present invention. Its compressive strength is tested according to the compressive strength test method in GB / T 50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete". The method for measuring the bonded splitting tensile strength...

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Abstract

The invention discloses a CRTS II type slab ballastless track wide-narrow joint quick repair polymer concrete, which is characterized by comprising the following components in parts by weight: 38-58 parts by weight of cement; 5-7 parts by weight of fly ash; 42-62 parts by weight of gravel; 10-20 parts by weight of sand; 10-30 parts by weight of an expansion agent; 17-20 parts by weight of water; 5-9 parts by weight of a water reducing agent; 0-2 parts by weight of a coagulant; 0-2 parts by weight of a retarder and 0.5 to 1.5 parts by weight of a concrete modifier. The slab ballastless track wide-narrow joint quick repair polymer concrete has the advantages of fast hardening, high bonding strength, small dry shrinkage rate, good bonding capability with a track plate after pouring and compact inside. Meanwhile, the slab ballastless track wide-narrow joint quick repair polymer concrete has high hourly strength, can greatly shorten the construction period and improve the construction efficiency, and overcomes the defects of slow hardening, low adhesive force, poor durability and the like in the prior art.

Description

technical field [0001] The invention belongs to the field of ballastless track building materials, and in particular relates to polymer concrete for quick repair of wide and narrow joints of CRTSII slab ballastless track and a preparation method thereof. Background technique [0002] In order to adapt to the rapid development of high-speed railways, my country has formed a complete set of ballastless track system technology with Chinese characteristics through introduction, digestion, absorption, and re-innovation. Improved ballastless track system formed on the basis of. The CRTSII slab ballastless track adopts a longitudinal connection structure, and the track slabs are longitudinally connected by 6 fine-rolled threaded steel bars, and wide and narrow joints are set between the track slabs. In order to release the temperature stress of the longitudinal track slabs and protect the prestressed steel bars between the ballastless track slabs, C55 high-strength concrete is pour...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B111/72
CPCC04B28/06C04B2111/72C04B2201/50C04B18/08C04B14/02C04B14/06C04B2103/302C04B24/2652C04B2103/0068C04B7/02C04B22/142C04B22/10C04B22/0013C04B2103/0045C04B24/383
Inventor 张世杰徐鹏娄会彬朱彬谭诗宇
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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