Fast test method of shearing resistance of bituminous mixture

Abstract

The invention discloses a fast test method of the shearing resistance of an bituminous mixture, and provides a new method for testing the shearing performance of a bituminous mixture which bears torsional shearing in the horizontal direction and constant pressure stress in the vertical direction on the basis of borrowing the conventional shearing performance test theory and according to the practical significance of coulomb law and shearing strength. The method provided by the invention not only is applicable to the bituminous mixture newly stirred in a laboratory, but also can be used for estimating the shearing resistance of the bituminous mixture in an actual road surface; and by utilizing the fast test method, not only can the shearing resistance of the bituminous mixture be tested, but also the cohesion and an internal friction angle which play a role in determining the shearing strength of the bituminous mixture can be obtained, so that the content of the shearing damage of the bituminous mixture can be deeply understood and accurately mastered conveniently, and a test analyzing means is provided for the optimum design of the bituminous mixture based on the shearing resistance.

Description

technical field [0001] The invention belongs to the application technical field of testing the mechanical properties of asphalt mixtures, and in particular relates to a rapid testing method for the shear resistance of asphalt mixtures. Background technique [0002] Asphalt concrete pavement has been widely used in China due to its advantages of comfortable driving and convenient maintenance. As the main building material of asphalt pavement, asphalt mixture has a great influence on the service life of the pavement structure and the driving safety of vehicles. Therefore, in order to improve the paving quality of asphalt pavement, it is of great practical significance to accurately test and evaluate the pavement performance of asphalt mixture, and to optimize the design of asphalt mixture on this basis. [0003] At present, most of the mechanical properties of asphalt mixtures have been evaluated in the design process, specifically: using fatigue tests in the laboratory to te...

AI Technical Summary

Problems solved by technology

However, shear resistance, as an important mechanical property of asphalt mixture, is often neglected in the process of asphalt mixture design and performance evaluation

[0004] The reason is mainly that the current asphalt mixture shear resistance test is cumbersome and requires large-scale equipment, and a unified test method and standard has not yet been formed. The specific performance is: (1) As the most commonly used shear test method, three The axial test requires large-scale and professional test equipment such as MTS and UTM, and the test steps are complicated and require high personnel; (2) The coaxial shear tester invented by Tongji University, Chang'an University and other research institutions in recent years and The traditional torsional shear instrument can only simply test the shear strength of asphalt mixture, but cannot evaluate the cohesion and internal friction angle of asphalt mixture that constitute the shear resistance; (3) Although Tongji University uses the penetration shear test The method of combining instrument and uniaxial compression test can determine the cohesion and internal friction angle of asphalt mixture, but the test involves two tests, and there are many test steps; in addition, because the objects of penetration test and uniaxial compression test are not the same Not the same test piece, so it will inevitably lead to inaccurate calculation results

[0005] From the above introduction, it can be seen that the current test methods for the shear performance of asphalt mixtures are more or less deficient, especially that various test methods cannot simply and accurately measure the cohesion and internal friction angle of asphalt mixtures. The above two indicators are the key to comprehensively and accurately evaluate the shear performance of asphalt mixture, and also the basis for the optimal design of asphalt mixture based on shear performance.

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