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Wear-resistant concrete for heavy-haul railway sleepers and preparation method of wear-resistant concrete

A technology for concrete and railway rails, which is applied in the field of building materials, and can solve the problems of coarse growth of hydration products, reduced wear resistance, and poor toughness of sleeper concrete, so as to improve the interface between cement paste and aggregates, reduce internal defects, and improve The effect of compactness and abrasion resistance

Inactive Publication Date: 2019-11-01
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Ordinary Portland cement is used as the main cementitious material system for the existing heavy-duty railway sleeper concrete. There are high contents of tricalcium silicate and tricalcium aluminate, the early hydration reaction of cement is fast, and the growth of hydration products is coarse. During the curing process, thermal damage to concrete is inevitable, resulting in microstructural defects inside the concrete, resulting in poor toughness and reduced wear resistance of sleeper concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A wear-resistant concrete for heavy-duty railway sleepers, made of the following materials by mass: 384 parts of high belite cement, 0.6 parts of nano-nucleating agent, 96 parts of mineral admixture, 28.8 parts of polymer, and 625 parts of fine aggregate 1230 parts of coarse aggregate, 4.25 parts of water reducer, and 127 parts of water.

[0032] Among them, the content of dicalcium silicate and tricalcium silicate in high belite cement is 51%, and the content of tricalcium silicate is 21%. The nano-nucleating agent is a nano-powder mixture composed of nano-calcium silicate and nano-calcium aluminate. The diameter is 30-200 nanometers. The mineral admixture is composed of S105 finely ground slag powder, silica fume with a particle size of 0.1-1 μm and metakaolin with a particle size of 5-25 μm in a mass ratio of 7:2:1. The polymer is Ethylene-vinyl acetate copolymer emulsion and polyacrylate emulsion, the fine aggregate is river sand, the fineness modulus is 2.6, the co...

Embodiment 2

[0042] A wear-resistant concrete for heavy-duty railway sleepers, which is made of the following materials in parts by mass: 432 parts of special cement for heavy-duty railway sleeper concrete, 1.2 parts of nano-nucleating agents, 48 ​​parts of mineral admixtures, 24 parts of polymers, fine bone 612 parts of material, 1243 parts of coarse aggregate, 1.10 parts of water reducer, and 129 parts of water.

[0043] Among them, the content of dicalcium silicate in high belite cement is 65%, and the content of tricalcium silicate is less than 17%. The nano-nucleating agent is a nano-powder mixture composed of nano-barium silicate and nano-silica. The diameter is 80-400 nanometers. The mineral admixture is composed of silica fume with a particle size of 0.1-1 μm and metakaolin with a particle size of 5-25 μm in a mass ratio of 5:1. The polymer is styrene-acrylic emulsion and polyacrylate emulsion. , The fine aggregate is river sand, the fineness modulus is 2.9, the coarse aggregate is...

Embodiment 3

[0046] A wear-resistant concrete for heavy-duty railway sleepers, which is made of the following materials by mass: 465 parts of special cement for heavy-duty railway sleeper concrete, 15 parts of mineral admixtures, 27 parts of polymers, 5 parts of nano-nucleating agents, fine bone 645 parts of material, 1210 parts of coarse aggregate, 1.05 parts of water reducer, and 125 parts of water.

[0047] Among them, the content of dicalcium silicate in high belite cement is 71%, and the content of tricalcium silicate is less than 14%. The nano-nucleating agent is a nano-particle suspension composed of nano-calcium silicate and nano-silica. The diameter is 60-300 nanometers. The mineral admixture is composed of silica fume with a particle size of 0.1-1 μm and metakaolin with a particle size of 5-25 μm in a mass ratio of 2:1. The polymer is ethylene-vinyl acetate copolymer emulsion. The fine aggregate is river sand with a fineness modulus of 2.7, the coarse aggregate is composed of 5-2...

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Abstract

The invention relates to wear-resistant concrete for heavy-haul railway sleepers and a preparation method of the wear-resistant concrete. The wear-resistant concrete is composed of the following components: in parts by mass, 350-600 parts of high belite cement, 0.5-10 parts of a nano-nucleating agent, 0-100 parts of a mineral admixture, 10-60 parts of a polymer, 500-800 parts of fine aggregate, 1100-1400 parts of coarse aggregate, 1-6 parts of a water reducing agent and 100-145 parts of water. The internal pore structure of the wear-resistant concrete for heavy-haul railway sleepers is refined, the defects in the interface transition zone are improved obviously, the compactness is good, the bonding performance between a cement hydration product and the aggregate interface is improved obviously, and the compressive strength, toughness and wear resistance of the concrete are improved significantly.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to wear-resistant concrete for heavy-duty railway sleepers and a preparation method thereof. Background technique [0002] Heavy-haul transportation has become one of the important directions of the world's railway development, and railway heavy-haul transportation has been confirmed by various countries as the main goal of railway freight research and development. The sleeper is a key component of the track structure, which bears the load from the rail in all directions and transmits it to the ballast bed, while effectively maintaining the regular and axial geometry of the track. Among them, concrete sleepers are the main type of sleepers for heavy-haul railways due to their large self-weight, high rigidity, and strong ability to maintain track geometry. However, with the increase of axle load and transportation volume of heavy-haul railway trains, heavy-dut...

Claims

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Application Information

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IPC IPC(8): C04B28/02E01B3/28C04B111/20
CPCC04B28/025C04B2111/2038C04B2201/52E01B3/28C04B22/00C04B22/0093C04B18/141C04B18/146C04B14/106C04B24/2623C04B24/2641C04B14/068C04B18/142C04B14/14C04B24/226C04B22/06C04B2103/302
Inventor 刘子科谢永江王月华何龙翁智财蒋睿胡建伟
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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