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Low-temperature-resistant nano modified asphalt and preparation method thereof

A nano-modified, low-temperature-resistant technology, used in building thermal insulation materials, building components, buildings, etc., can solve the problems of high temperature performance and elasticity decline, viscous components unable to resist long-term load, poor rutting resistance, etc., and achieve low temperature relaxation. Performance improvement, good three-dimensional spatial network structure, and the effect of strengthening the interface effect

Inactive Publication Date: 2020-06-05
CHANGAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, liquid rubber-modified asphalt has poor anti-rutting ability in medium-high temperature environment, and its viscous component has greatly increased, making it unable to resist long-term load in high-temperature environment. Therefore, the high-temperature performance and elasticity of rubber asphalt are severely reduced. Therefore, it is of great significance to develop an asphalt material that can resist low temperature rubber-modified asphalt and make up for its shortcomings, which is of great significance for improving the performance of asphalt pavement and the utilization of waste tires.

Method used

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  • Low-temperature-resistant nano modified asphalt and preparation method thereof
  • Low-temperature-resistant nano modified asphalt and preparation method thereof
  • Low-temperature-resistant nano modified asphalt and preparation method thereof

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preparation example Construction

[0038] A kind of preparation method of the low-temperature-resistant nano-modified asphalt provided by the invention comprises the following steps:

[0039] Step 1, take base asphalt, nano silicon dioxide, rock bitumen, stabilizer, lime powder and liquid rubber LSBR according to the number of parts by mass; Wherein, described stabilizer is a kind of in mixture, sulfur and sulfur-containing organic compound or several kinds; the mixture is composed of 25 parts of sodium linoleate, 25 parts of diatomaceous earth and 50 parts of sulfur powder;

[0040] Step 2, heating the base asphalt to a molten state and keeping it warm;

[0041] Step 3. Set the constant temperature oil bath at 60°C, place the base asphalt in it, add liquid rubber LSBR into it after the temperature is constant, and stir manually. At this time, the modified asphalt should be a solid with strong viscous resistance. In the molten state, keep stirring manually at a constant speed for 20-30min, the mixing speed is ...

Embodiment 1

[0052] In this embodiment, the nano-modified asphalt raw materials are calculated according to the mass fraction: 100 parts of No. 90 road petroleum asphalt, 2 parts of LSBR with a molecular weight of 20,000, 1 part of lime powder, 2.5 parts of stabilizer, 17.5 parts of rock asphalt, and 3 parts of JH-silica;

[0053] Heat 500 parts of base asphalt to 165°C, add 2 parts of 2w-LSBR, and manually stir the oil bath at a constant temperature of 60°C at a constant speed of 200r / min. Strong solid-melt state, then stand at room temperature for 2h. Then heat the rubber-modified asphalt to about 145°C. At this time, the asphalt should be in a molten and flowing state. Add 17.5 parts of rock asphalt and 3 parts of JH-silica to the asphalt to obtain a blend, perform shearing and grinding, and stir the mixture evenly. At this time, the temperature is lowered to 155°C, and the high-speed shearing and stirring is performed for 10 minutes every 5 minutes. This cycle is repeated four times, t...

Embodiment 2

[0055] The nano-modified asphalt raw materials in this example are calculated according to mass fraction: 100 parts of No. 90 road petroleum asphalt, 3 parts of 20,000 molecular weight LSBR, 0.5 parts of lime powder, 2 parts of stabilizer, 15 parts of rock asphalt, and 4 parts of JH-silica.

[0056] Heat 500 parts of base asphalt to 160°C, add 3 parts of 2w-LSBR, and manually stir in an oil bath at a constant temperature of 70°C at a stirring speed of 195r / min, keep stirring at a constant speed, and then let it stand at room temperature for 2h. Heat the rubber-modified asphalt to about 137°C, add 15 parts of rock asphalt and 4 parts of JH-silica to obtain a blend, perform shearing and grinding, and stir evenly into the mixture. At this time, the temperature is raised to 165°C, every 10 minutes High-speed shearing and stirring for 10 minutes, this cycle is repeated four times, the highest shearing rate is 5500r / min, and the shearing time is 80mins; then add 2 parts of stabilizer...

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Abstract

The invention provides low-temperature-resistant nano modified asphalt and a preparation method thereof. The low-temperature-resistant nano modified asphalt is prepared from the following raw materials: 100 parts of matrix asphalt, 0.5 to 6 parts of liquid rubber LSBR, 1 to 7 parts of nano silicon dioxide, 1 to 3 parts of a stabilizer, 15 to 20 parts of rock asphalt and 2 to 4 parts of lime powder. The mechanical strength and toughness of the composite modified asphalt are better than those of matrix asphalt, and the composite modified asphalt has good high-temperature performance, aging resistance, fatigue resistance and other characteristics. After surface modification, the contact angle of the nano silicon dioxide reaches 70-150 degrees.

Description

technical field [0001] The invention relates to the technical field of pavement asphalt materials, in particular to a low-temperature-resistant nano-modified asphalt and a preparation method thereof. Background technique [0002] Asphalt pavement in alpine permafrost regions faces severe low temperature shrinkage cracking and freeze-thaw cycle fatigue damage. The asphalt pavement in this area faces severe low temperature shrinkage, cracking and fatigue damage from freeze-thaw cycles. Because they are subjected to strong ultraviolet radiation at high altitudes, this will accelerate the aging of asphalt and affect its service life. However, traditional modified asphalt cannot solve this problem. [0003] Rubber powder is often used as asphalt modifier. It can not only effectively improve road performance, but also make full use of waste rubber tires. In recent decades, as a representative rubber-modified asphalt technology, it has been extensively researched and developed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L9/06C08K13/06C08K9/06C08K3/36C08K3/26C08K3/06C08K7/26
CPCC08K2003/2206C08K2201/011C08L95/00C08L2201/08C08L2205/025C08L2205/03C08L9/06C08K13/06C08K9/06C08K3/36C08K3/26C08K3/06C08K7/26
Inventor 马峰李晨傅珍代佳胜董文豪刘健王蒙蒙常晓绒武孟
Owner CHANGAN UNIV
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