FATIGUE AND HEALING OF ASPHALT MIXTURES: DISCRIMINATE ANALYSIS OF FATIGUE CURVES

FATIGUE AND HEALING OF ASPHALT MIXTURES: DISCRIMINATE ANALYSIS OF FATIGUE CURVES. Castro, M., Sánchez, J. A. Journal of Transportation Engineering, 132 (2), 168-174. 2006.

Abstract
Fatigue laws obtained by means of laboratory tests do not usually take into account the fact that asphalt mixtures in highways have rest periods (without loads). These rest periods tend to increase the fatigue life of mixtures due to the phenomenon known as healing. A new fatigue test which includes rest periods has been developed. In order to study healing, tests with and without rest have been carried out on asphalt concrete, and the corresponding fatigue curves have been obtained. The test results show an increase of five to ten times fatigue strength. This paper summarizes the main experiences. The testing method used in the research is described. The results are analyzed by means of a statistical technique called discriminate analysis.

Keywords
Asphalt pavements, Mixtures, Fatigue, Laboratory tests

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DAMAGE BASED MODEL FOR PREDICTION OF ASPHALT CONCRETE FATIGUE CURVES

DAMAGE BASED MODEL FOR PREDICTION OF ASPHALT CONCRETE FATIGUE CURVES. Castro, M., Sánchez, J. A. Journal of Materials in Civil Engineering, 19 (8), 700-702. 2007.

Abstract
In order to represent the behavior of asphalt concrete mixtures during fatigue tests, a phenomenological model based on the continuous damage theory has been developed. From this model, a method for estimation of fatigue curves was formulated. From a practical point of view, this method could allow us to estimate classic fatigue curves testing a smaller number of specimens. The formulated method was applied to three mixtures, and results were compared with ones from the standard procedure for determining fatigue curves.

Keywords

Fatigue, Damage, Asphalt concrete, Asphalt mixes, Predictions

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ESTIMATION OF ASPHALT CONCRETE FATIGUE CURVES – A DAMAGE THEORY APPROACH

ESTIMATION OF ASPHALT CONCRETE FATIGUE CURVES – A DAMAGE THEORY APPROACH. Castro, M., Sánchez, J. A. Construction and Building Materials, 22 (6), 1232-1238, 2008

Abstract

In order to represent the behaviour during fatigue tests of asphalt concrete mixtures, a phenomenological model, based on the continuous damage theory, has been developed. From this model, a method for estimation of fatigue curves was formulated. From a practical point of view, the use of this method enables classic fatigue curves to be estimated with a smaller number of specimens tested. This method of estimating fatigue curves was applied to three mixtures, and its results were compared with those of the standard procedure.

Keywords: Asphalt mixes; Fatigue; Damage


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