Constitutive Modeling of Fatigue Damage Response of Asphalt Concrete Materials

Different kinds of hot mix asphalt mixtures are used in highway and runway constructions. Each of these mixtures cater to specific needs and differ from each other in the type and percentage of aggregates and asphalt used, and their response can be markedly different. Constitutive models used in the literature do not differentiate between these different kinds of mixtures and use models which treat them as if they are one and the same. In this study, we propose constitutive models for two different kinds of hot mix asphalt, viz., asphalt concrete and sand asphalt. We use a framework for materials that possess multiple natural configurations for deriving the constitutive equations. While asphalt concrete is modeled as a two constituent mixture, sand asphalt is modeled as a single constituent mixture due to the peculiarity in its makeup. In this study, we present a unified approach for deriving models for these different kind of mixtures. In a companion paper, we compare the predictions of the model for a compressive creep test with available experimental results.

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Constitutive Modeling of Asphalt Bound Granular Materials: Applications to Sand Asphalt

Applied Mechanics and Biomedical Technology ◽

10.1115/imece2002-32476 ◽

2002 ◽

Author(s):

J. Murali Krishnan ◽

K. R. Rajagopal

Keyword(s):

Granular Materials ◽

Asphalt Concrete ◽

Constitutive Modeling ◽

Hot Mix Asphalt ◽

Constitutive Relations ◽

Experimental Studies ◽

Compressive Creep ◽

Multiple Natural Configurations

In the earlier paper, we developed constitutive relations for two kinds of hot mix asphalt, viz., asphalt concrete and sand asphalt using the framework of materials with multiple natural configurations. In the present paper, we apply the framework that we developed for sand asphalt to study compressive creep experiments. Experimental studies of Wood and Goetz (1959) are used to compare with the predictions of the model.

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The Use of Laboratory-Measured and Strain-Gauge Backcalculated Asphalt Stiffness for Rutting Performance Prediction

Transportation Research Record Journal of the Transportation Research Board ◽

10.1177/0361198119825644 ◽

2019 ◽

Vol 2673 (3) ◽

pp. 323-333

Author(s):

Erdem Coleri ◽

John T. Harvey

Keyword(s):

Performance Prediction ◽

Strain Gauge ◽

Asphalt Concrete ◽

Laboratory Tests ◽

Concrete Materials ◽

Long Term Performance ◽

Term Performance ◽

The Impact

Laboratory tests are conducted with asphalt concrete materials to determine the expected in-situ performance. In addition, laboratory test results are commonly used in mechanistic-empirical design methods for material characterization to improve the predictive accuracy of the models. However, the effectiveness of laboratory tests in characterizing the long-term performance of asphalt concrete materials needs to be validated to be able to use the results for pavement design and long-term performance prediction. Inaccurate performance characterization and prediction can directly affect the decision-making process for pavement maintenance, rehabilitation, and reconstruction and result in unexpected early failures in the field. The major objective of this study is to determine the impact of using laboratory-measured asphalt stiffness on the prediction accuracy of mechanistic-empirical models. In addition, the effect of using linear-elastic modeling assumptions (layered elastic theory) and neglecting the nonlinearity of pavement response at high load levels (and/or at high strain levels for weaker structures) on the predicted rutting performance was determined. In this study, the effectiveness of the use of laboratory asphalt stiffness tests for in-situ asphalt stiffness characterization was determined by comparing the rutting performance predicted using laboratory-measured stiffness to rutting predicted using strain-gauge backcalculated stiffness. It was determined that laboratory tests are able to characterize the in-situ stiffness characteristics of the asphalt mix used in this study and the stiffness characterization process suggested in this study can provide reliable rutting performance predictions. Results of this study are only applicable to tested rubberized asphalt concrete mixtures.

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Analysis of the Mechanic Behavior and Rutting of Asphalt Concrete Using a Sand Model

Journal of Mechanics ◽

10.1017/s1727719100000460 ◽

1999 ◽

Vol 15 (4) ◽

pp. 177-184

Author(s):

Ming-Lou Liu

Keyword(s):

Asphalt Concrete ◽

Stress Path ◽

Plasticity Model ◽

Test Results ◽

Research Subjects ◽

Stress Strain ◽

Strain Behavior ◽

Strain Relationship ◽

Concrete Materials ◽

Relationship Of

AbstractThe stress-strain relationship of the sand and asphalt concrete materials is one of the most important research subjects in the past, and many conctitutive laws for these materials have been proposed in the last two decades. In this study, the Vermeer plasticity model is modified and used to predict the behavior of the sand and asphalt concrete materials under different stress path conditions. The results show that the predictions and test results agree well under different stress path conditions. However, the orignal Vermeer model can not predict the stress-strain behavior of the asphalt concrete. Finally, the modified Vermeer plasticity model is incorporated with the pavement rutting model to predict the rut depth of pavement structure under traffic loadings.

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