Evaluation of epoxy modification in asphalt mastic
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ORIGINAL ARTICLE
Evaluation of epoxy modification in asphalt mastic Panos Apostolidis . Xueyan Liu . Paul Marocho . Martin van de Ven . Sandra Erkens . Tom Skarpas
Received: 24 January 2020 / Accepted: 12 May 2020 Ó The Author(s) 2020
Abstract In-depth understanding of the synergetic effect between the various incorporating constituents in asphalt binders (e.g., polymers, fillers) is needed to design durable paving materials with desired properties. In this research, the focus was first on the effect of the reactivity of fillers on the evolution of adhesive strength between stone aggregates and epoxy modified asphalt mastics during the epoxy polymerization. Uniaxial tensile tests were performed on different combinations of fillers and binders with and without the epoxy-based polymer, and at different modification levels. Based on the results of the tensile tests, the increase of the adhesive strength of mastic with aggregates was generally lower when reactive filler particles (i.e., hydrated lime) were added than of epoxy binders with non-reactive filler. In other words, the non-reactive fillers did not influence the adhesion process and were thus selected for the next step studies on aging. The chemo-mechanical changes of epoxy modified asphalt mastics were analysed after pressure
P. Apostolidis (&) X. Liu P. Marocho M. van de Ven S. Erkens T. Skarpas Section of Pavement Engineering, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, Netherlands e-mail: [email protected] T. Skarpas Department of Civil Infrastructure and Environmental Engineering, Khalifa University of Science and Technology, Abu Dhabi, United Arab Emirates
aging vessel and oven-conditioning after various aging times by means of Fourier transform infrared spectroscopy and dynamic shear rheometer. Less sulfoxides formed and higher modulus levels were measured with increasing the epoxy polymer in mastics over oven- and PAV-aging conditions. Due to the pressure difference, the rate of modulus increases and phase angle decrease was higher when the materials were conditioned in PAV than in oven. Keywords Epoxy asphalt Asphalt binder Bitumen Filler Aging Long-life pavement
1 Introduction Asphalt binder, which is a petroleum derivative, is the most widely used binding material in pavement structures. With the continuously increasing costs to maintain high quality infrastructure, the implementation of new technologies has become top priority for road agencies all over the world. New or relatively new materials, such as epoxy-based polymers in asphalt binders, are attracting the interest of the international pavement engineering community. In comparison with the thermoplastic block copolymers, epoxy-based polymers are thermosetting and thus remain at solid state when they are fully polymerized. The modification of asphalt binders with epoxy-based polymers is well-recognized, among
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others, because of their high resistance aga
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