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Asphalt aging index determination method

A measurement method, asphalt technology, applied in the direction of applying stable tension/compression to test the strength of materials, measuring devices, and preparation of test samples, etc., can solve the problem of directly and objectively reflecting the aging degree of asphalt, difficulty in applying on-site production, Troublesome detection procedures and other problems, to achieve the effect of simple and direct measurement method, suitable for on-site production

Active Publication Date: 2021-01-12
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 ductility, penetration ratio, softening point and other indicators of asphalt after aging, and can only test the indicators of one aging degree of asphalt; 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 aging degree of the used asphalt varies widely due to the limitation of site conditions. The comprehensive detection of ratio, ductility, viscosity, softening point, etc., the detection procedure is cumbersome, and the change trends of these are often different, making it difficult to judge, difficult to directly and objectively reflect the aging degree of asphalt, and difficult to apply to on-site production

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0066] The present embodiment provides a kind of assay method of asphalt aging index, and it comprises the following steps:

[0067] 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;

[0068] 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;

[0069] 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);

[0070] Step 4: Use asphalt mixtures with different aging degrees to form cylindrical specimens according to the test method T0702 of "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011);

[0071] Step 5: Carry out the low-temperature splitting test of...

Embodiment 2

[0080] This embodiment discloses the application of a method for determining the aging index of asphalt;

[0081] 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 T0716 test method of "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), to obtain splitting tensile strength and failure tensile strength Strain; the details are as follows:

[0082]

[0083] 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 better. For low temperature crack ...

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Abstract

The invention discloses an asphalt aging index determination method, which comprises aging production asphalt to obtain aged asphalt, adding the aged asphalt to the production asphalt according to different proportions to obtain mixed asphalt, preparing an asphalt mixture by using the mixed asphalt, and determining the splitting tensile strength and the breaking tensile strain of the asphalt mixture; and then calculating an asphalt aging index A by adopting the adding amount of the aged asphalt and the curve of the breaking tensile strain component with the inflection point through the addingamount of the inflection point, the splitting tensile strength value and the breaking tensile strain value. According to the determination method disclosed by the invention, the asphalt mixture is directly used as a matrix for testing, the influence of the asphalt aging degree on the low-temperature crack resistance of the asphalt mixture can be truly and objectively reflected, and the determination method 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 asphalt aging indicators. 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 problems such as asphalt aging and traffic load after 4 to 5 years of opening 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 too ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/42G01N3/08G01N17/00G01N1/28
CPCG01N33/42G01N3/08G01N17/00G01N1/28
Inventor 郭立成李浩曾国东方杨李超徐艺珅袁妙丁思尹成浩
Owner FOSHAN TRANSPORTATION SCI & TECH CO LTD