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Device and method for testing shear performance of asphalt mixture

A technology of asphalt mixture and test device, which is applied in the direction of using stable shear force to test the strength of materials and preparation of test samples, etc., can solve the problem that the constant height repeated shear test equipment is expensive and cannot form a shear failure surface. , Judging the shear failure of the test piece and other problems, to achieve the effect of stable test results, simple and cheap test equipment, and easy promotion

Inactive Publication Date: 2010-07-28
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

On the one hand, triaxial test equipment and constant-height repetitive shear test equipment are expensive and not convenient for engineering promotion
On the other hand, these test methods often cannot form an obvious shear failure surface, and it is only proved that the specimen belongs to shear failure through theoretical analysis, but it cannot be judged intuitively that the specimen belongs to shear failure.

Method used

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  • Device and method for testing shear performance of asphalt mixture
  • Device and method for testing shear performance of asphalt mixture
  • Device and method for testing shear performance of asphalt mixture

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Embodiment

[0054] 1. The diameter of the indenter is 40mm; the size of the test piece is: the diameter of the asphalt mixture sample is 150mm, and the height is 95mm; the size of the ring is: the outer diameter is 150mm, and the inner diameter is 80mm. The mechanical model is established by computer general finite element program for calculation and analysis. The load is the load compressive stress p=1Mpa acting on the indenter; the boundary condition is that the bottom of the specimen is fixed in the vertical direction, and there are no lateral constraints around the specimen. Use the finite element program to calculate the first principal stress σ of each point in the specimen 1 and the third principal stress σ 3 , according to the third strength theory, the maximum shear stress τ max . The conversion relation between maximum shear stress and load compressive stress is: τ max = Load compressive stress × 0.52. The compression-shear conversion coefficients of the ring shear test are...

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Abstract

The invention discloses a device and a method for testing shear performance of an asphalt mixture. The shear strength and shear fatigue life of the asphalt mixture under different temperature conditions are tested by adopting a circular ring shearing test. The method comprises that: before the test, an asphalt mixture test-piece is subjected to heat preservation in a temperature control box at a preset test temperature for over 6 hours; in the test, the asphalt mixture test-piece is arranged on a circular ring, and is loaded through a pressure head to cause shear failure so as to form a conical shear failure surface, and the shear strength of the asphalt mixture is calculated; and according to requirements, a specific load in a range of 0.1 to 0.9 time of failure load is selected to perform a repeated loading fatigue test on parallel test-pieces, the loading waveform is sine waves, the frequency is 10Hz, and the shear fatigue life of the asphalt mixture at different stress ratios is read out. The test method has important significance for studying the shear performance of the asphalt mixture and designing and evaluating the material of the asphalt mixture.

Description

technical field [0001] The invention belongs to the field of road engineering, and relates to an asphalt mixture shear performance test device and method, which are used for measuring the shear strength and shear fatigue life of the asphalt mixture. Background technique [0002] With the development of economic construction, my country's road infrastructure construction has developed rapidly. Asphalt concrete pavement has been widely used in road engineering construction due to its many advantages. Most of them are asphalt concrete pavements. [0003] In most parts of my country, in the hot season, the surface temperature of the asphalt pavement can reach above 60°C. Under the action of wheel load, the non-uniform load will generate a large shear stress on the concrete surface. In the process of asphalt pavement design, the shear resistance of asphalt mixture is not considered. Once the shear stress of the material is greater than or close to the shear strength, the pavement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24G01N1/28
Inventor 郑健龙钱国平黄拓
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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