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Normalization method for fatigue characteristics of asphalt mixture under different stress states

A technology of asphalt mixture and stress state, which is applied in the direction of using stable tension/compression to test the strength of materials, and can solve problems such as non-conformity and constant tensile strength.

Inactive Publication Date: 2018-12-07
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

At the same time, he also used the Desai strength yield surface model to normalize the fatigue characteristics of asphalt mixture under different stress states, compared and analyzed the fatigue test results under the two modes of stress control and strain control, and obtained two control modes of stress and strain The fatigue properties can be normalized, but it is considered that the tensile strength under different loading rates is constant, which is not consistent with the actual situation

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  • Normalization method for fatigue characteristics of asphalt mixture under different stress states
  • Normalization method for fatigue characteristics of asphalt mixture under different stress states
  • Normalization method for fatigue characteristics of asphalt mixture under different stress states

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Embodiment

[0059] 1) Direct tensile fatigue test method

[0060] The mineral material is screened layer by layer, and the weighed mineral material is preheated in the oven for 4 hours to fully dry the mineral material. Each time, add mineral material or asphalt to the mixing pot and stir for 90 seconds to make the aggregate Stir well. Using the vibrating compactor, it is convenient to adjust parameters such as vibration mode, compaction height and compaction rate. The size of the roll-formed test panel is 400mm×300mm×50mm; it is then cut into beam-type test pieces of 250×50×50mm for direct tensile strength and fatigue tests;

[0061] The test adopts the MTS-Landmark material testing system. The direct tensile test piece is kept at a constant temperature of 15°C in an incubator for 4-5 hours. The operating program is compiled through the built-in MPT and the applied load and acquisition parameters are set. The force of each loading cycle It is automatically measured by the data acquisit...

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Abstract

The invention discloses a normalization method for fatigue characteristics of an asphalt mixture under different stress states. The strength yield surface of the asphalt mixture based on a yield criterion is established by combining strength and fatigue test at different loading speeds under different stress states with a Desai strength yield surface model, a fatigue characteristic analysis technology based on the yield criterion is provided, and a normalization model for the fatigue characteristics of the asphalt mixture in different stress states is obtained. The fatigue characteristic analysis technology and the normalization model can be used to eliminate a difference between the fatigue test results of the asphalt mixture under different test conditions and make up for the deficiencyof no accurate evaluation of the fatigue performances of the asphalt mixture in traditional S-N fatigue equation; and the method realizes the unified expression of the fatigue performances of the asphalt mixture under different test conditions, and provides a theoretical, technologic and technical basis for realizing the scientific transformation from material fatigue to structural fatigue.

Description

technical field [0001] The invention relates to the technical field of road engineering, in particular to a method for normalizing the fatigue properties of asphalt mixture under different stress states. Background technique [0002] Fatigue cracking is the most common form of damage to asphalt pavement structures. In order to ensure good durability and usability of asphalt pavement, asphalt pavement design methods in various countries in the world use the fatigue resistance of pavement materials as the basis for determining the design life. A variety of low-cost, short-period indoor fatigue test methods are used to study the fatigue resistance of asphalt pavement. In Europe and the United States, cantilever trapezoidal specimens or beam specimens are mostly used, and half-sine wave loads are applied to the ends for fatigue tests. The stress modes are two-point bending, three-point bending and four-point bending; Japan mostly uses cylindrical specimens for indirect Tensile ...

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Application Information

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IPC IPC(8): G01N3/08
CPCG01N3/08
Inventor 吕松涛刘超超樊喜雁王双双郑健龙
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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