Design of gap-graded mixtures for wearing courses based on Fénix test

Rodrigo MIRÓ
Catedrático de Caminos
Universidad Politécnica de Cataluña (08034 Barcelona)

Félix E. PÉREZ-JIMÉNEZ
Catedrático de Caminos
Universidad Politécnica de Cataluña (08034 Barcelona)

Adriana MARTÍNEZ
Titular teacher
Universidad Politécnica de Cataluña (08034 Barcelona)

Ramón BOTELLA
Profesor Asociado
Universidad Politécnica de Cataluña (08034 Barcelona)

ABSTRACT

In Spain, the design of gap-graded mixtures for wearing courses has been based primarily on Marshall and Cántabro tests, depending on the type of mixture: in the case of dense mixtures for thin layers, with lower void content, resistance to plastic deformation had to be validated (Marshall test), whereas in the case of gap-graded mixtures, with higher void content, resistance to disintegration had to be assured (Cántabro test). Currently, the Spanish Specification for gap-graded mixtures has included the indirect tensile test, aimed at evaluating the effect of water action. But in any case, important properties for these mixtures as the cracking resistance and the fracture energy are considered in the design stage. Therefore the possibility of assessing these properties, using the indirect tensile test and a new direct tensile test, the Fénix test, developed by the Road Research Laboratory of the Technical University of Catalonia, is proposed.

KEYWORDS:

Bitumen mix, Asphalt mix, Design, Cracking resistance, Fénix test, Fracture energy, Cántabro test, Indirect tensile test.

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