Method for measuring asphalt aging degree

Abstract

The invention discloses an asphalt aging degree 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 flexural tensile strength and the beam bottom maximum flexural tensile strainof the asphalt mixture; 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, and 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. 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 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...

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.

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