Fatigue behaviour of macrofiber reinforced gap graded asphalt mixtures
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ORIGINAL ARTICLE
Fatigue behaviour of macrofiber reinforced gap graded asphalt mixtures Francisco Morea Rau´l Zerbino
. Miguel Sol-Sanchez . Fernando Moreno-Navarro .
Received: 11 December 2019 / Accepted: 16 June 2020 RILEM 2020
Abstract The addition of fibres to reinforce asphalt mixtures is a prospective field for pavement engineering, where the use of glass or synthetic macrofibers could potentially help not only as reinforcement for new asphalt mixtures, but also as part of asphalt overlays applied on deteriorated pavements to diminish reflective cracking during maintenance operations. In recent studies, it has been found that the addition of macrofibres can improve the rutting and fracture resistance of asphalt mixtures. However, the response of these mixtures to fatigue has not been studied yet. In this study, a complete performance characterization of a gap graded asphalt mixture with the addition of glass and synthetic macrofibres was studied. Also, a reference asphalt mixture without macrofibres was provided for comparison. Results showed that the F. Morea (&) R. Zerbino Construction Department, Engineering Faculty, National University of La Plata and CONICET, 1 Street and 47 Street, 1900 La Plata, Argentina e-mail: [email protected]; [email protected] R. Zerbino e-mail: [email protected] M. Sol-Sanchez F. Moreno-Navarro Construction Engineering Laboratory of the University of Granada (LabIC.UGR), Severo Ochoa w/n, 18071 Granada, Spain e-mail: [email protected] F. Moreno-Navarro e-mail: [email protected]
addition of macrofibres improves water sensibility, rutting performance and stiffness of the gap grade asphalt mixtures studied. Also, it was observed during the fatigue tests that the incorporation of both types of macrofibres greatly improved the durability of the mixtures to fatigue cracking at medium range temperatures. This improved fatigue behaviour correlates to an extended useful life for the fibre reinforced asphalt mixtures. The synthetic macrofibres showed better fatigue behaviour at lower temperatures, while glass macrofibres gave a better response at the higher temperature studied. Keywords Macrofibers Gap grade asphalt mixture Fatigue Rutting Stiffness
1 Introduction Asphalt mixtures are used as the base and surface layers of flexible pavements. Accordantly with Pereira and Pais [1], they are one of the most expensive elements of road construction and are also the highest cost element for maintenance operations, apart from the bridges and viaducts. These flexible layers have the role of supporting the traffic and climate conditions. With regard to traffic induced stress, the mechanistic-empirical design approach was conceived by Dormon and Metcalf [2], essentially calculating the pavement structure response (stresses and strains) to
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one or more distresses (cracking and permanent deformation), as a function of the material’s properties, layer thickness and loading conditions. However,
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