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A method for simulating the aging of asphalt aqueous solution

A simulation method, the technology of aqueous solution, applied in the field of materials, can solve the problems of reduced service life, lack of aging process of asphalt aqueous solution, increase of pits and grooves in asphalt pavement, etc.

Active Publication Date: 2021-01-05
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the aging of the aqueous solution, the cohesion of the asphalt gradually decreases, resulting in loosening and peeling of the asphalt, and greatly increasing the pits and grooves of the asphalt pavement, which seriously affects the road performance of the asphalt pavement and reduces its service life
Asphalt pavement is used in a wide range. The pH value, medium type and content of the aqueous solution in the natural environment vary greatly. The effects of different types of aqueous solution and asphalt are different. At present, there is still a lack of experimental methods that can truly simulate the aging process of asphalt aqueous solution.

Method used

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  • A method for simulating the aging of asphalt aqueous solution
  • A method for simulating the aging of asphalt aqueous solution
  • A method for simulating the aging of asphalt aqueous solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Preparation of aqueous solution

[0019] Take 100ml of distilled water.

[0020] Preparation of Asphalt Membrane Specimens

[0021] Take 15 grams of 70# asphalt that has been thermally aged in a film heating oven at 163°C for 5 hours, and pour it directly into a glass dish with a diameter of 15 cm and a height of 3 cm, and self-leveling to form an asphalt film specimen with a thickness of about 0.85 mm. Pour 100ml of distilled aqueous solution into a glass dish, and soak it at 40°C for 14 days and 28 days respectively to carry out the water aging test.

[0022] After the soaking time is up, take out 15ml of the aqueous solution to test the organic carbon content of the aqueous solution; rinse the asphalt surface with distilled water, then dry the glass dish containing the asphalt in an oven at 120°C for 1 hour, and cool it to room temperature for at least one day before taking it out Do the following test.

[0023] Water-aged asphalt performance test

[0024] The dr...

Embodiment 2

[0036] Preparation of aqueous solution

[0037] Prepare 100ml of an aqueous solution with a pH value of 3 using the stepwise dilution method with sulfuric acid to simulate an acid rain solution.

[0038] Preparation of Asphalt Membrane Specimens

[0039] Take 15 grams of 70# asphalt that has been thermally aged in a film heating oven at 163°C for 5 hours, and pour it directly into a glass dish with a diameter of 15 cm and a height of 3 cm, and self-leveling to form an asphalt film specimen with a thickness of about 0.85 mm. Inject 100ml of the acid solution into glass dishes and soak them at 40°C for 14 days and 28 days respectively to carry out the water aging test.

[0040] After the soaking time is up, take out 15ml of the aqueous solution to test the organic carbon content of the aqueous solution; rinse the asphalt surface with distilled water, then dry the glass dish containing the asphalt in an oven at 120°C for 1 hour, and cool it to room temperature for at least one d...

Embodiment 3

[0054] Preparation of aqueous solution

[0055] Use NaOH to prepare 100ml of alkaline solution with a pH value of 11 to simulate alkaline aqueous solution.

[0056] Preparation of Asphalt Membrane Specimens

[0057] Take 15 grams of 70# asphalt that has been thermally aged in a film heating oven at 163°C for 5 hours, and pour it directly into a glass dish with a diameter of 15 cm and a height of 3 cm, and self-leveling to form an asphalt film specimen with a thickness of about 0.85 mm. Inject 100ml of alkali solution into a glass dish and soak at 40°C for 14 days and 28 days respectively for water aging test.

[0058] After immersion, take out 10ml of the aqueous solution to test the organic carbon content of the aqueous solution; rinse the surface of the asphalt with distilled water, then dry the glass dish containing the asphalt in an oven at 120°C for 1 hour, and cool it to room temperature for at least one day before taking it out for use. Test below.

[0059] Water-age...

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Abstract

The invention discloses an analogy method for aging of an asphalt aqueous solution. The method comprises the following steps of: determining the pH value and the concentration of the contained mediumof an aqueous solution contacted by an outdoor service asphalt pavement under extreme conditions according to the type of the aqueous solution, and preparing an analogy aqueous solution; preparing asphalt film specimens with a film thickness of less than 1 mm after short-term thermal oxygen aging of the asphalt; and placing the asphalt film specimens in a sample tray, and using the analogy water solution to carry out a water aging erosion test according to the total effective time of outdoor water erosion. The invention provides a method in which the aqueous solution of the corresponding medium is prepared according to the type of the aqueous solution in the outdoor service environment to carry out the water erosion on the asphalt so as to simulate the water erosion during the service of the asphalt.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to an asphalt aqueous solution aging simulation method. Background technique [0002] The design service life of asphalt pavement on high-grade highways in my country is usually 15 years. However, due to the aging of asphalt under the action of natural environmental factors, the pavement performance of some asphalt pavements declines too quickly, and cracks, looseness, Potholes and other road surface diseases seriously threaten the quality and safety of roads. Therefore, how to scientifically evaluate the aging degree and anti-aging performance of asphalt, improve the anti-aging performance of asphalt pavement, and prolong the service life of asphalt pavement have become major issues that road researchers need to solve. [0003] Asphalt pavement is in service in the natural environment, and it is inevitably aged by natural factors such as light, heat, oxygen, and water...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/42G01N21/3563
CPCG01N21/3563G01N33/42
Inventor 庞凌杨浩吴少鹏蔡盛强邹莹雪刘云鹏
Owner WUHAN UNIV OF TECH
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