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Strength check method for asphalt pavement

A technology of asphalt pavement and strength checking, which is applied in the direction of applying stable tension/pressure to test the strength of materials, etc. It can solve the problems that the resistance of asphalt mixture cannot be objectively characterized, the structural resistance cannot be truly reflected, and the pavement damage characteristics cannot be objectively reflected.

Inactive Publication Date: 2015-07-01
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

At present, asphalt pavement design in my country uses the theory of maximum tensile stress strength as the failure criterion, which cannot objectively reflect the failure characteristics of the pavement; the strength under simple stress states such as ordinary tension, compression, bending and splitting cannot objectively represent the resistance of asphalt mixtures; The actual pavement is in a three-dimensional stress state under the action of wheel loads, and the one-dimensional strength theory cannot truly reflect the resistance of the structure, and cannot consider the synergistic effect of various failure factors

Method used

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  • Strength check method for asphalt pavement
  • Strength check method for asphalt pavement
  • Strength check method for asphalt pavement

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Embodiment 1

[0040] Step a. Carry out mechanical analysis on the typical asphalt pavement structure. According to the regulations in the highway asphalt pavement design specification, use the multi-layer elastic continuous system theory under the action of double-circle vertical uniform load to calculate the mechanical response of the pavement structure, and obtain the asphalt pavement hazard Principal stress σ at point 1L, σ 2L , σ 3L Respectively -0.278MPa, -0.443MPa, -0.682MPa; according to σ i = 1 3 ( σ 1 L - σ 2 L ) 2 + ( σ ...

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Abstract

The invention discloses a strength check method for an asphalt pavement. The method comprises the step of carrying out planar isobaric / axial compression, planar isobaric / axial tension, planar tension-compression, planar compression / axial compression, planar tension-compression / axial compression, planar tension-compression / axial tension and planar anisobaric / axial compression tests on the basis of a three-axis test system and a three-axis test method for an asphalt mixture to obtain a multi-axis strength test result for the asphalt mixture. According to the new method for carrying out strength check on an asphalt pavement according to an asphalt mixture breakage criterion in a complex stress state, the problem that the existing one-dimensional strength theory is incapable of objectively reflecting the breakage characteristics and the resistance of a pavement structure is solved, and the refinement level of an asphalt pavement design is improved.

Description

technical field [0001] The invention belongs to the field of road engineering, in particular to a method for checking the strength of asphalt pavement. technical background [0002] Asphalt pavement has the advantages of comfort, safety, easy construction and maintenance, open traffic and fast traffic, and is widely used as a pavement material for modern highways. By the end of 2014, my country had completed 100,000 kilometers of highways open to traffic, ranking second in the world, of which more than 90% are asphalt roads. According to the development plan, in the next two years, the total mileage of expressways in my country is expected to surpass that of the United States and become the world's largest; in the next ten years, tens of thousands of kilometers of expressways and one million kilometers of ordinary roads will be built. During the construction of high-grade highway asphalt pavement, road workers have solved a lot of technical problems and accumulated rich pra...

Claims

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Application Information

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IPC IPC(8): G01N3/12
Inventor 黄拓郑健龙钱国平
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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