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Temperature correlation characterization method for fatigue characteristics of asphalt mixture

A technology of asphalt mixture and temperature correlation, applied in the direction of strength characteristics, testing material strength by applying repeated force/pulsation force, analyzing materials, etc., can solve the problem of less research on temperature fatigue

Inactive Publication Date: 2019-09-03
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

Most of the relevant literature considers the load fatigue characteristics of materials, but there are few studies on temperature fatigue

Method used

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  • Temperature correlation characterization method for fatigue characteristics of asphalt mixture
  • Temperature correlation characterization method for fatigue characteristics of asphalt mixture
  • Temperature correlation characterization method for fatigue characteristics of asphalt mixture

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Embodiment Construction

[0037] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0038] The establishment of the traditional fatigue life equation does not consider the influence of temperature on fatigue life. However, in the actual pavement structure, the fatigue damage caused by temperature cannot be underestimated. The invention is a temperature correlation characterization method for the fatigue characteristics of asphalt mixture under a simple stress state, and improves the fatigue life equation.

[0039] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0040] Such as figure 1 As shown, the temperature-dependent...

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Abstract

The invention belongs to the technical field of road engineering, and discloses a temperature correlation characterization method for fatigue characteristics of an asphalt mixture. A mix proportion isdesigned for the asphalt mixture, an asphalt-aggregate ratio is determined, and a low frequency fatigue test under a different temperature is developed for the asphalt mixture under the asphalt-aggregate ratio; and a different fatigue life corresponding to the asphalt mixture under a different temperature in a simple stress state is obtained through origin fitting software, and the traditional fatigue life equation is then modified. The applicability of different fatigue test methods is analyzed from multiple angles, and a minitype beam four-point bending fatigue test is finally adopted for low-temperature and low-frequency fatigue performance. The fatigue life of the asphalt mixture is greatly influenced by a load control mode, and based on whether a load condition changes, the load is divided to simple load and composite load.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to a temperature-dependent characterization method for fatigue properties of asphalt mixture. Background technique [0002] At present, the closest existing technology: the failure form of fatigue cracking is relatively common in asphalt pavement. It is meaningful to study its fatigue characteristics to improve the fatigue life of asphalt mixture. Road workers from various countries have also conducted in-depth research on it. In the asphalt pavement design methods at home and abroad, the fatigue performance index is regarded as an indispensable important index, which plays an active guiding role in the design, construction and maintenance of asphalt mixture pavement. The ability of asphalt mixture to resist fatigue damage can be characterized by the fatigue strength during the fatigue test and the fatigue life at the time of failure. [0003] Traditionally, as...

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Application Information

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IPC IPC(8): G01N3/32
CPCG01N3/32G01N2203/0062G01N2203/0222
Inventor 吕松涛樊喜雁夏诚东张芳超郑健龙
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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