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A method for measuring asphalt aging parameters
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A technology of aging parameters and measurement methods, applied in the direction of applying stable tension/pressure to test material strength, measuring devices, and preparation of test samples, etc., can solve the problems of inability to test asphalt mixtures, difficulty in applying on-site production, and difficult asphalt aging to achieve the effect of simple, direct and accurate reflection of the measurement method
Active Publication Date: 2022-04-29
FOSHAN TRANSPORTATION SCI & TECH CO LTD
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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
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Embodiment 1
[0084] The present embodiment provides a kind of assay method of asphalt aging parameter, 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) T0610 test method 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]
[0089]
[0090] (3) Get aged asphalt and replace production asphalt with the ratio of 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%, form mixed asp...
Embodiment 2
[0104] This embodiment discloses the application of a method for measuring asphalt aging parameters;
[0105] 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:
[0106]
[0107] 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 performance of AS2 asphalt is better. For low tempe...
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Abstract
The invention discloses a method for measuring asphalt aging parameters, which comprises aging asphalt for production to obtain aged asphalt, and measuring the penetration, ductility and softening point of the asphalt before and after aging; adding the aged asphalt to the asphalt for production in different proportions Among them, the mixed asphalt is obtained, and then the asphalt mixture is prepared by using the mixed asphalt, and the splitting tensile strength and failure tensile strain of the asphalt mixture are measured; then the curve with the inflection point is constructed by using the aging asphalt addition amount and the failure tensile strain. The addition amount of the inflection point, the splitting tensile strength value and the tensile strain value at failure are used to calculate the asphalt aging index A, and then the asphalt aging parameters are calculated through the aging index, penetration change rate, ductility change rate, and softening point change rate. The measuring method in the present invention can truly and objectively reflect the influence of the aging degree of the asphalt on the overall performance of the asphalt, 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 asphalt aging parameters. 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 too ...
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