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Test method of compound cracking of asphalt mixture

A technology for asphalt mixture and cracking test, which is applied in the directions of analyzing materials, preparation of test samples, measuring devices, etc., to achieve the effects of stable and reliable test results, simple and easy test methods, and improved crack resistance performance.

Inactive Publication Date: 2013-08-14
SOUTHEAST UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the existing laboratory test method for simulating the cracking of asphalt mixture, and to design and develop a test method that can simulate the composite cracking of asphalt mixture, which is used to study the cracking of composite reflective cracks of asphalt mixture characteristic

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  • Test method of compound cracking of asphalt mixture

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Embodiment Construction

[0017] The composite cracking test method of the asphalt mixture of the present invention is suitable for determining the mechanical properties of different composite cracking of the asphalt mixture at a specified temperature and loading rate, and can also be used for the design of the asphalt pavement structure in selecting the mechanical index parameters of the asphalt mixture and evaluating the asphalt mixture. It is used for the crack resistance of different composite cracks of the mixture. The test temperature and loading rate can be selected according to the local climatic conditions and the purpose of the test. When used to evaluate the crack resistance of the composite cracking of the asphalt mixture, the test temperature of -10℃±0.5℃ and the loading rate of 0.5mm / min should be used.

[0018] (1) Principle of test method

[0019] The asphalt mixture composite cracking test method of the invention combines the asphalt mixture composite cracking test device, selects appr...

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Abstract

The invention discloses a test method of compound cracking of an asphalt mixture. According to the test method, proper test conditions and test indexes are selected to realize laboratory simulation for the compound cracking of the asphalt mixture, wherein an asphalt mixture testing component can be placed to different stressing modes in order to realize an open type (type I) compound cracking mode and a shearing type (type II) compound cracking mode; three test index parameters proposed in the test method, namely, peak load, breaking energy and crack angle, show definite physical meaning, therefore, the compound cracking characteristic of the asphalt mixture can be quantifiably represented, and the cracking performance of the asphalt mixture at a low temperature condition also can be assessed. The test method can be applied to the study on expansion mechanism of a reflection crack of the asphalt mixture, and can provide a guide for the design of an asphalt concrete pavement structure and material, thus improving the cracking performance of an asphalt concrete pavement.

Description

technical field [0001] The invention specifically relates to a test method for simulating composite cracking of asphalt mixtures, and belongs to the technical field of road engineering. Background technique [0002] The typical asphalt pavement structure in my country is semi-rigid base asphalt pavement, and reflection cracks are one of the more common diseases. According to fracture mechanics, the propagation of cracks can be divided into three basic types: open type, shear type (in-plane shear), and tear type (out-of-plane shear), which are denoted as type I, type II, and type III, respectively. . For the reflection crack problem of asphalt pavement, scholars at home and abroad have done a lot of research on test conditions, test methods, material composition, load characteristics, and environmental factors. Indoor tests to simulate cracking of asphalt mixture abroad mainly include indirect tensile test, semicircle bending tensile test, unilateral notched beam test, disc...

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Application Information

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IPC IPC(8): G01N1/28G01N3/04G01N3/00
Inventor 高磊倪富健白安众罗海龙
Owner SOUTHEAST UNIV
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