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Bridge floor stress absorbing layer material with high elastic recovery rate and preparation method thereof

A stress-absorbing layer and recovery rate technology, applied to building insulation materials, building components, buildings, etc., can solve the problems of limited viscoelastic properties of asphalt, and achieve the effects of increased rate and stiffness, and excellent stress absorption effect

Active Publication Date: 2022-05-13
SHENYANG JIANZHU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the material of this layer is generally made of relatively elastic rubber asphalt, high-viscosity modified asphalt or composite modified asphalt. As the traffic volume continues to increase, the level of reflected stress formed by the stress concentration of the bridge deck continues to increase. Due to the limited viscoelastic properties of the asphalt used in the current bridge deck stress-absorbing layer materials, the stress-absorbing effect still has a large gap. Room for improvement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Independent swelling of rubber powder in matrix asphalt

[0030] Stir the rubber powder in a stirring pot at 50°C for 80s to fully preheat the rubber powder, then add surface activation component A, stir for 30 minutes, increase the temperature to 70°C, add surface activation component B (mass ratio, rubber powder: Surface activation component A: surface activation component B=100:15:5), stirring for 10min, finally, turn off the temperature of the stirring pot, reduce the temperature of the stirring pot to room temperature, and after continuing to stir at room temperature for 60min, the surface activation rubber pink.

[0031] Heat the base asphalt to 165°C, keep it warm for 15 minutes, place it in a high-speed shearing machine, and then add surface-activated rubber powder, tackifier component, and compatibilizer component (mass ratio, base asphalt: surface-activated rubber powder: tackifier Components: compatibilizing component = 100:30:5:6), high-speed shearing fo...

Embodiment 2

[0051] 1) Independent swelling of rubber powder in matrix asphalt

[0052] Stir the rubber powder in a stirring pot at 50°C for 80s to fully preheat the rubber powder, then add surface activation component A, stir for 10 minutes, raise the temperature to 70°C, add surface activation component B (mass ratio, rubber powder: Surface activation component A: surface activation component B=100:5:3), stirring for 5 minutes, finally, turn off the temperature of the stirring pot, lower the temperature of the stirring pot to room temperature, and continue stirring at room temperature for 30 minutes to obtain surface-activated rubber powder .

[0053] Heat the base asphalt to 160°C, keep it warm for 10 minutes, place it in a high-speed shearing machine, and then add surface-activated rubber powder, viscosity-increasing component, and compatibilizing component (mass ratio, base asphalt: surface-activated rubber powder: viscosity-increasing Components: Compatibility component = 100:35:4:5...

Embodiment 3

[0073] 1) Independent swelling of rubber powder in matrix asphalt

[0074] Stir the rubber powder in a stirring pot at 50°C for 120s to fully preheat the rubber powder, then add surface activation component A, stir for 10 minutes, increase the temperature to 70°C, add surface activation component B (mass ratio, rubber powder: Surface activation component A: surface activation component B=100:20:6), stirring for 10min, finally, turn off the temperature of the stirring pot, lower the temperature of the stirring pot to room temperature, and continue stirring at room temperature for 60min to obtain surface activated rubber powder .

[0075] Heat the base asphalt to 170°C, keep it warm for 20 minutes, place it in a high-speed shearing machine, and then add surface-activated rubber powder, viscosity-increasing component, and compatibilizing component (mass ratio, base asphalt: surface-activated rubber powder: viscosity-increasing Components: compatibilization component = 100:45:6:7...

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Abstract

The invention discloses a bridge floor stress absorbing layer material with high elastic recovery rate and a preparation method thereof, the bridge floor stress absorbing layer material is prepared from high-resilience modified asphalt and premixed macadam as raw materials, and the high-resilience modified asphalt is prepared according to the following processes: 1) an independent swelling process of rubber powder in matrix asphalt, 2) an independent swelling process of SIS in the matrix asphalt; and (3) mixing and secondary swelling. When the high-resilience modified asphalt is applied to preparation of a bridge deck stress absorbing layer mixture, the formation of bridge deck reflection cracks can be prevented. According to the invention, high-elasticity modified component network construction is realized, the technical problems of limited mixing amount of rubber powder and SIS and insufficient elasticity caused by high viscosity of composite modified asphalt are overcome, and the composite modified asphalt is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering materials, in particular to a bridge deck stress absorbing layer material with high elastic recovery rate and a preparation method thereof. Background technique [0002] With the rapid development of the country's economy, the scale of my country's highway transportation network has continued to expand, and the planning and construction of large-scale cross-river and sea bridges and urban expressway viaducts have developed rapidly. Among them, the bridge deck pavement plays a key role in protecting the bridge deck and driving wear, and its service effect is the focus of bridge builders around the world. [0003] However, with the continuous increase of bridge spans in my country in recent years, under the dynamic load of bridge deck traffic, bridge deck pavement materials tend to have greater reflected stress at stress concentration locations such as interlayers or beam-slab joints. , s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/26C08L95/00C08L53/02C08L19/00
CPCC04B26/26C08L95/00C08L2205/035C08L2205/025C08L53/02C08L19/003C04B18/12Y02A30/30
Inventor 赵明宇李志强丁庆军范璐璐王心童李进辉涂亮亮许勐宋鹏
Owner SHENYANG JIANZHU UNIVERSITY