Active powder concrete for railroad bridge cover plate

A technology of active powder and concrete, which is applied in the field of bridge construction, can solve the problems of endangering the safety of pedestrians and construction equipment, poor vertical and horizontal dynamic characteristics of bridges, and poor durability of sidewalk cover plates, etc., to achieve excellent durability, excellent durability, low cost effect

Inactive Publication Date: 2009-10-28
CHINA RAILWAY FIRST GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the railway sidewalk cover slabs are mainly reinforced concrete structures. Due to the low strength level of concrete, poor durability, low impact resistance, and poor construction quality, etc., the existing railway bridge cover slabs generally suffer from concrete corrosion and corrosion of steel bars. , broken boards and other diseases, some have endangered the safety of pedestrians and construction machinery
At the same time, the ordinary concrete sidewalk cover is heavy, which increases the quality of the bridge, resulting in poor vertical and horizontal dynamic characteristics of the bridge
Based on the above factors, the durability of the existing reinforced concrete sidewalk cover is poor, and the maintenance cost in the later period is very high, especially it cannot meet the design requirements of my country's railway passenger dedicated line

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The raw material composition of this embodiment is: cement 650kg, silicon powder 180kg, quartz sand 1180kg, admixture 180kg, steel fiber 145kg, admixture 30kg, water 145kg.

[0016] Wherein, the cement is low-alkali Portland cement or low-alkali ordinary Portland cement whose measured strength grade is not less than 42.5, and C in the cement clinker of the cement 3 The content of A (that is, tricalcium aluminate) is not more than 8%. Active SiO in the silicon powder 2 The content is not less than 92%. The particle size of the quartz sand is less than 1.18mm and its mud content is less than 0.5%. The length of the steel fibers is not greater than 15 mm and the aspect ratio thereof is not less than 50, and the tensile strength of the steel fibers is not less than 1500 MPa. The admixture is a non-air-entraining high-efficiency water reducer with a water reducing rate of not less than 25%. The external admixture is fly ash, and the fly ash is Class I fly ash, specifical...

Embodiment 2

[0023] The difference between this embodiment and Example 1 is that the raw materials of this embodiment consist of: cement 680kg, silicon powder 190kg, quartz sand 1200kg, fly ash 200kg, steel fiber 140kg, admixture 35kg, water 150kg. The admixture is polycarboxylate superplasticizer.

[0024] The preparation process of this embodiment is the same as that of embodiment 1.

Embodiment 3

[0026] The difference between this embodiment and Example 1 is that the raw materials of this embodiment consist of: cement 680kg, silicon powder 170kg, quartz sand 1200kg, slag 250kg, steel fiber 140kg, admixture 38kg, water 160kg.

[0027] The preparation process of this embodiment is the same as that of embodiment 1.

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Abstract

The invention discloses an active powder concrete for a railroad bridge cover plate, which is prepared by evenly mixing cement, silica powder, quartz sand, admixture, steel fiber, additive and water according to the weight ratio of 650-700:170-200:1,150-1,200:160-250:140-150:30-40:135-160, wherein the admixture is fly ash or slag, and the additive is a non-air-entraining type high-efficiency water reducing agent. The active powder concrete has the advantages of superior lasting quality, high-grade compression strength and rupture strength and simple preparation process, and a footway cover plate processed from the active powder concrete can completely satisfy the design requirement on special lines for passenger trains in China and has small workloads of later-period maintenance.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to an active powder concrete for a railway bridge cover plate. Background technique [0002] The railway bridge sidewalk cover, that is, the railway bridge cover is an auxiliary facility of the bridge, which mainly bears the load of pedestrians and corresponding small road maintenance machinery and equipment. At present, the railway sidewalk cover slabs are mainly reinforced concrete structures. Due to the low strength level of concrete, poor durability, low impact resistance, and poor construction quality, the existing railway bridge cover slabs generally suffer from concrete corrosion and corrosion of steel bars. , Broken boards and other diseases, some have endangered the safety of pedestrians and construction machinery. At the same time, ordinary concrete sidewalk cover slabs are heavy, which increases the quality of the bridge, resulting in poor vertica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B28/04C04B14/04C04B14/06C04B14/48
Inventor 陆建新牛丽坤白杨军伍建国马鹏虎
Owner CHINA RAILWAY FIRST GRP CO LTD
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