Ageing-resistant road asphalt based on magnesium-aluminum-based laminar double hydroxide and preparation method thereof

A technology of double hydroxide and road asphalt, which is used in building structures, building components, building thermal insulation materials, etc., can solve the problems that the anti-aging agent asphalt is difficult to play, the asphalt becomes hard and brittle, and the performance of asphalt pavement is damaged. , to achieve excellent UV blocking effect, achieve long-term effectiveness, and improve the effect of aging resistance

Active Publication Date: 2011-09-14
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, asphalt is an organic material, which is very susceptible to thermal oxygen and photo-oxidative aging under the influence of high temperature and ultraviolet radiation, which makes the asphalt hard and brittle, resulting in cracks, ruts, potholes, spalling and other diseases on the asphalt pavement. These have greatly damaged the performance of asphalt pavement and shortened its service life
[0003] Since asphalt is composed of thousands of organic compounds with extremely complex molecular structures, its aging mechanism is different from that of general organic polymer materials, so it is difficult for anti-aging agents that are effective for organic polymer materials such as rubber and plastic to work in asphalt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 2 parts (parts by mass, the same below) of magnesium-aluminum-based layered double hydroxide (formed as Mg 0.75 al 0.25 (OH) 2 (CO 3 ) 0.12 1.2H 2 O, and surface-modified by petroleum sulfonate, the particle size in the a and b directions is 2.1 μm, and the grain thickness in the c-axis direction is 0.13 μm, about 110 layers) After adding 98 parts, the temperature has risen to 140 °C In the asphalt (softening point 48°C, penetration 82dmm), keep the temperature at 140-150°C and stir at 4000rpm for 1.5h to obtain a magnesium-aluminum-based layered double hydroxide aging-resistant road asphalt.

[0019] The magnesium-aluminum-based layered double hydroxide aging-resistant road asphalt was subjected to an ultraviolet aging test (the irradiation intensity of the ultraviolet lamp was 1200 μW / cm 2 , irradiated for 6 days, the same below), the viscosity at 135°C before and after aging increased from 850cp to 1570cp, an increase of 720cp, and the ductility at 5°C decreased...

Embodiment 2

[0021] Add 5 parts of magnesium-aluminum-based layered double hydroxide to 95 parts of asphalt (softening point 48°C, penetration 82dmm) that has been heated to 150°C, keep the temperature at 150-160°C, and stir at 3000rpm for 2h , to obtain a magnesium-aluminum-based layered double hydroxide aging-resistant road asphalt.

[0022] The viscosity at 135°C of the magnesium-aluminum-based layered double hydroxide aging-resistant road asphalt before and after ultraviolet aging increased from 930cp to 1420cp, an increase of 788cp, and the softening point increased from 49.1°C to 53.2°C, an increase of 4.1°C. For ordinary road asphalt without magnesium-aluminum-based layered double hydroxide, the viscosity at 135°C increased from 620cp to 2100cp before and after ultraviolet aging, an increase of 1480cp, and the softening point increased from 48°C to 56.3°C, an increase of 8.5°C. Similar to Example 1, the aging-resistant road asphalt added with magnesium-aluminum-based layered double ...

Embodiment 3

[0024]Add 8 parts of magnesium-aluminum-based layered double hydroxide to 92 parts of asphalt (softening point 48°C, penetration 82dmm) that has been heated to 150°C, keep the temperature at 150-160°C, and stir at 6000rpm for 2h , to obtain a magnesium-aluminum-based layered double hydroxide aging-resistant road asphalt.

[0025] The viscosity at 135°C of the magnesium-aluminum-based double hydroxide aging-resistant road asphalt before and after ultraviolet aging increased from 1100cp to 1310cp, an increase of 210cp, and the ductility at 5°C decreased from 9.5cm to 6.2cm, a decrease of 3.3cm. For ordinary road asphalt without magnesium-aluminum-based layered double hydroxide, the viscosity at 135°C increased from 620cp to 2100cp before and after ultraviolet aging, an increase of 1480cp, and the ductility at 5°C decreased from 10.5cm to 3.4cm, a decrease of 7.1cm. Similar to Example 1, the aging-resistant road asphalt added with magnesium-aluminum-based layered double hydroxide...

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Abstract

The invention relates to ageing-resistant road asphalt and a preparation method thereof, in particular to ageing-resistant road asphalt based on magnesium-aluminum-based laminar double hydroxide. The road asphalt is characterized by being prepared from the following raw materials in percentage by mass: 90-99 percent of asphalt and 1-10 percent of magnesium-aluminum-based laminar double hydroxide. The dual functions of physical shielding and chemical absorption of the magnesium-aluminum-based laminar double hydroxide on ultraviolet rays are utilized, so that the ultraviolet aging resistance of the road asphalt is remarkably improved.

Description

technical field [0001] The invention relates to an aging-resistant road asphalt and a preparation method thereof. Background technique [0002] Asphalt pavement has become the preferred pavement type for high-grade highways because of its excellent road performance. However, asphalt is an organic material, which is very susceptible to thermal oxygen and photo-oxidative aging under the influence of high temperature and ultraviolet radiation, which makes the asphalt hard and brittle, resulting in cracks, ruts, potholes, spalling and other diseases on the asphalt pavement. These have greatly damaged the performance of the asphalt pavement and shortened its service life. [0003] Since asphalt is composed of thousands of organic compounds with extremely complex molecular structures, its aging mechanism is different from that of general organic polymer materials, so it is difficult for anti-aging agents effective for organic polymer materials such as rubber and plastic to play a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08K9/04C08K3/26
Inventor 吴少鹏王金山余剑英陈美祝庞凌韩君冯振刚
Owner WUHAN UNIV OF TECH
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