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Method for measuring asphalt aging coefficient

A technology of aging coefficient and determination method, which is applied in the application of stable bending force to test material strength, measurement device, and preparation of test samples, etc., can solve problems such as difficulty in field production, mismatch, and difficult asphalt aging degree, achieve accurate reflection

Active Publication Date: 2021-01-12
FOSHAN TRANSPORTATION SCI & TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such different trends often make it difficult to effectively judge the aging degree of asphalt.
[0004] In addition, the above-mentioned test indicators are the performance of asphalt itself, and cannot be directly tested for asphalt mixture, which causes a mismatch with the actual situation on site
On the one hand, in the actual production process, the aging degree of asphalt used varies widely due to the limitation of site conditions, so it is unreasonable to only use the indicators of penetration ratio, softening point, and ductility to represent the actual aging of asphalt used; On the one hand, due to the different changing trends of various parameters, it is difficult to judge, it is difficult to directly and objectively reflect the aging degree of asphalt, and it is difficult to apply to on-site production

Method used

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  • Method for measuring asphalt aging coefficient
  • Method for measuring asphalt aging coefficient
  • Method for measuring asphalt aging coefficient

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] The present embodiment provides a kind of assay method of asphalt aging coefficient, and it comprises the following steps:

[0085] (1) Take asphalt for production, and measure its penetration PI according to the test methods T0604, T0605, and T0606 of "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011) b , ductility DF b and softening point SP b ;

[0086] (2) Aging the asphalt for production according to the test method T0610 of "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011) to obtain aged asphalt; E20-2011) T0604, T0605, T0606 test methods to determine the penetration PI a , ductility DF a and softening point SP a ;

[0087] The various data of production bitumen and aged bitumen are as follows:

[0088] Penetration PI (0.1mm) Ductility DF(5℃,cm) Softening point SP(℃) production bitumen 21 35.5 89.4 aged asphalt 10 8.3 87.4

[0089] (3) Get age...

Embodiment 2

[0103] This embodiment discloses the application of a method for determining the aging coefficient of asphalt;

[0104] Specifically, take two kinds of asphalt, numbered AS1 and AS2, and age them according to the test method T0610 of "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), then conduct ductility and penetration ratio tests, and use Samples with the same gradation and asphalt ratio as in Example 1 were subjected to a low-temperature bending test according to the test method T0715 of "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), to obtain the flexural tensile strength and the maximum bending at the bottom of the beam Tensile strain; the details are as follows:

[0105]

[0106] According to the traditional indicators, the residual ductility, penetration ratio and softening point of AS2 asphalt are larger than those of AS1 asphalt. It can be concluded that the anti-aging performanc...

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Abstract

The invention discloses a method for measuring an asphalt aging coefficient, which comprises the following steps: aging asphalt for production to obtain aged asphalt, and measuring penetration, ductility and softening point of the asphalt before and after aging; adding aged asphalt into production asphalt according to different proportions to obtain mixed asphalt, further preparing an asphalt mixture by adopting the mixed asphalt, and measuring the flexural-tensile strength of the asphalt mixture and the maximum flexural-tensile strain of a beam bottom; and then constructing a curve with an inflection point by adopting the addition amount of the aged asphalt and the maximum flexural-tensile strain of the beam bottom, calculating the asphalt aging degree A according to the addition amount of the inflection point, the flexural-tensile strength value and the maximum flexural-tensile strain value of the beam bottom, and calculating the asphalt aging coefficient according to the aging degree, the needle penetration change rate, the ductility change rate and the softening point change rate. The determination method provided by the invention can truly and objectively reflect the influenceof the asphalt aging degree on the comprehensive performance of the asphalt, and has positive significance for evaluating the asphalt quality and guiding field production.

Description

technical field [0001] The invention relates to the technical field of asphalt detection, in particular to a method for measuring the aging coefficient of asphalt. Background technique [0002] With the development of my country's economy and society, the people's demand for transportation has gradually increased. In recent years, a large number of asphalt roads have been built in our country. With the massive construction of asphalt pavement, many problems have been exposed. Generally speaking, the newly built asphalt pavement will crack due to the aging of the asphalt and the traffic load 4 to 5 years after it is opened to traffic. In recent years, a large number of cracks have appeared on some highway pavements in the second winter after the completion of construction. One of these cracks will appear about 5-8m along the driving direction. After investigation, it is found that the cause of premature cracks is the asphalt during the construction process. The storage time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/42G01N3/20G01N17/00G01N1/28
CPCG01N33/42G01N3/20G01N17/00G01N1/28
Inventor 曾国东李浩郭立成方杨成浩李超丁思尹徐艺珅袁妙
Owner FOSHAN TRANSPORTATION SCI & TECH CO LTD