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Asphalt mixture multi-stage loaded high-temperature creep curve analysis method based on axle load spectrum

An asphalt mixture, high temperature creep technology, applied in the direction of material inspection products, etc., can solve the problem of huge difference in axle load, and achieve the effect of simple and easy evaluation method.

Active Publication Date: 2016-04-13
SOUTHEAST UNIV
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the existing dynamic creep test is based on the half-sine wave loading method of a single load. This loading method is very different from the axle load on the actual road surface, and the effect of road surface maintenance cannot be realized in practical applications.

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  • Asphalt mixture multi-stage loaded high-temperature creep curve analysis method based on axle load spectrum
  • Asphalt mixture multi-stage loaded high-temperature creep curve analysis method based on axle load spectrum
  • Asphalt mixture multi-stage loaded high-temperature creep curve analysis method based on axle load spectrum

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Embodiment Construction

[0012] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0013] The method of the present invention comprises the following steps:

[0014] 1) The multi-stage loading high temperature creep curve of asphalt mixture is divided into three stages:

[0015] The first stage is the initial compaction stage, which is controlled to be completed within the first loading sequence; after the first stage is over, it is the second stage, and the second stage is the linear growth stage of cumulative micro-strain. The micro-strains of s all show linear growth, but with the change of the stress level, the rate of micro-strain growth also changes greatly; after the end of the second stage, the third stage is entered, and the third stage is the stage of rapid growth of cumulative micro-strain. Stage asphalt mixture has been in a state of high temperature instability.

[0016] 2) Three major indices are calculated acco...

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Abstract

The invention discloses an asphalt mixture multi-stage loaded high-temperature creep curve analysis method based on an axle load spectrum. Creep curves at the second creep stage in different-stage loading process are subjected to linear fitting to acquire a cumulative microstrain growth slope, the responsive high-temperature creep characteristic indexes LSI, CDA and MFN are calculated according to the formula. In the parameters, the relatively big MFN represents relatively strong permanent deformation resisting capability of the mixture under the multi-stage loading action, the relatively small LSI shows that the mixture is relatively insensitive to variation of axle load and probably is relatively strong in heavy duty resistance, and the relatively small CDA shows that the creep damage generation rate of the asphalt mixture is relatively balanced and the asphalt mixture is insensitive to loading of a circular spectral pattern.

Description

technical field [0001] The invention belongs to the field of road maintenance, and in particular relates to an analysis method for multi-stage loading high temperature creep curve of asphalt mixture based on axle load spectrum. Background technique [0002] Permanent deformation damage such as rutting has always been one of the most typical and most harmful forms of disease in my country's high-grade asphalt pavement. Scholars at home and abroad have carried out a lot of research on the high temperature creep behavior of asphalt pavement, especially in terms of test methods. The NCHRP research program in the United States has carried out research on the simple performance test method of asphalt mixture, and finally found that dynamic modulus test and dynamic creep The test can well evaluate and predict the high temperature rutting resistance of asphalt mixture. [0003] However, the dynamic creep test is based on a half-sine wave loading method of a single load, which is ve...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/42
CPCG01N33/42
Inventor 倪富健蒋继望高磊娄深鑫
Owner SOUTHEAST UNIV
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