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A method for measuring the aging degree of asphalt

A measurement method and technology of aging degree, which are applied in the direction of measuring device, preparation of test samples, testing material strength by applying stable bending force, etc., can solve problems that are difficult to apply to on-site production, directly and objectively reflect the degree of asphalt aging, Insufficient crack resistance of asphalt pavement and other problems, to achieve the effect of adapting to on-site production and simple and direct measurement method

Active Publication Date: 2022-04-29
FOSHAN TRANSPORTATION SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 was found that the reason for the premature cracks was the asphalt during the construction process. The storage time is too long, and the heating temperature is too high during the mixing process, resulting in premature aging of the asphalt, which leads to insufficient crack resistance of the asphalt pavement and premature cracks
[0003] At present, my country's standards only stipulate the indicators such as ductility, penetration ratio, and aging index after aging of asphalt, and can only test the indicators of asphalt with a certain degree of aging; and the test indicators are the performance of asphalt itself, which cannot be directly aimed at Asphalt mixture was tested, which caused a mismatch with the actual situation on site
On the one hand, in the actual production process, the asphalt used in the actual production process is limited by site conditions, and its aging degree varies widely. It is difficult to test comprehensively such as ratio, ductility, viscosity, aging index, etc., and the change trends of these are often not the same. 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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  • A method for measuring the aging degree of asphalt
  • A method for measuring the aging degree of asphalt
  • A method for measuring the aging degree of asphalt

Examples

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Effect test

Embodiment 1

[0067] The present embodiment provides a kind of assay method of asphalt aging degree, and it comprises the following steps:

[0068] Step 1: take production asphalt and age according to the test method T0610 of "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011) to obtain aged asphalt;

[0069] Step 2: taking aged asphalt to replace production asphalt in proportions of 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100%, to form mixed asphalt;

[0070] Step 3: Take mixed asphalt with different aging degrees and prepare AC-25 hot mix asphalt mixture according to "Technical Specifications for Construction of Highway Asphalt Pavement" (JTG F40-2017);

[0071] Step 4: Use asphalt mixtures with different aging degrees to form prism samples according to the test method T0703 of "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011);

[0072] Step 5: According to the "Test Regulations for Asphalt and Asp...

Embodiment 2

[0081] This embodiment discloses the application of a method for determining the aging degree of asphalt;

[0082] 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:

[0083]

[0084] According to the traditional indicators, the residual ductility and penetration ratio of AS2 asphalt are larger than those of AS1 asphalt. It can be concluded that the anti-aging performance of AS2 asphalt is be...

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Abstract

The invention discloses a method for measuring the aging degree of asphalt, which comprises aging asphalt for production to obtain aged asphalt, adding the aged asphalt to the asphalt for production in different proportions to obtain mixed asphalt, and then preparing asphalt mixture by using the mixed asphalt , to measure the flexural tensile strength of the asphalt mixture and the maximum flexural and tensile strain at the bottom of the beam; then use the amount of aged asphalt and the maximum flexural and tensile strain at the bottom of the beam to construct a curve with an inflection point, through the addition of the inflection point, the value of the flexural tensile strength and the value of the beam Calculate the asphalt aging degree A based on the maximum bending and tensile strain at the bottom. The measuring method in the present invention directly uses the asphalt mixture as the base to test, can truly and objectively reflect the influence of the aging degree of the asphalt on the low-temperature crack resistance of the asphalt mixture, and has positive significance for judging the quality of the asphalt and guiding on-site production.

Description

technical field [0001] The invention relates to the technical field of asphalt detection, in particular to a method for measuring the aging degree 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 is t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/42G01N3/20G01N17/00G01N1/28
CPCG01N33/42G01N3/20G01N17/00G01N1/28
Inventor 郭立成李浩曾国东方杨徐艺珅袁妙丁思尹成浩李超
Owner FOSHAN TRANSPORTATION SCI & TECH CO LTD