C-f Characterization Model for Design of Asphalt Mixtures and Asphalt Pavements

Fwa, T
Center for Transportation Research, Department of Civil Engineering, National University of Singapore, Singapore

Tan, S
Center for Transportation Research, Department of Civil Engineering, National University of Singapore, Singapore

(Received 28 November 2003; accepted 23 November 2004)
JOURNAL JAI
Abstract
This paper reports the results of a research effort initiated in the early 1990s to develop a C-f (cohesion-angle of friction) characterization model for the design of asphalt mixtures and asphalt pavements. It is demonstrated that, since the model is based on the fundamental material properties represented by C and f, it can derive analytically other asphalt mix design parameters such as Marshall stability and flow, and indirect tensile strength. The C-f characterization model therefore offers a useful basis for the development of a comprehensive design framework that integrates asphalt mix design with asphalt pavement structural design. To demonstrate this capability, the research developed an empirical-mechanistic rutting prediction model of asphalt pavement layer using the C-f characterization model. In addition, the model allows stresses and strains under design loading to be computed, which can be applied as input to structural analysis for asphalt material selection and pavement thickness design.

Keywords:
asphalt, asphalt mixtures, cohesion, elastic modulus, friction angle, mix design, pavement design, rutting prediction, triaxial test

Paper ID: JAI12262
DOI: 10.1520/JAI12262

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Author Fwa, T Affiliation Center for Transportation Research, Department of Civil Engineering, National University of Singapore, Singapore Author Tan, S Affiliation Center for Transportation Research, Department of Civil Engineering, National University of Singapore, Singapore Title: C-f Characterization Model for Design of Asphalt Mixtures and Asphalt Pavements Symposium: Performance of Hot Mix Asphalt (HMA), including Fundamental and Empirical Procedures, 2003-12-9
Committee: D04 on Road and Paving Materials