Research Article Rheological Characterization of Warm-Modified Asphalt Mastics Containing Electric Arc Furnace Steel Slags M. Pasetto, A. Baliello, G. Giacomello, and E. Pasquini Department of Civil, Environmental and Architectural Engineering (ICEA), University of Padua, Via Marzolo 9, 35131 Padua, Italy Correspondence should be addressed to E. Pasquini; emiliano.pasquini@unipd.it Received 31 December 2015; Revised 4 February 2016; Accepted 7 February 2016 Academic Editor: Jainagesh A. Sekhar Copyright © 2016 M. Pasetto et al. Tis is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Te environmental sustainability of road materials and technologies plays a key role in pavement engineering. In this sense, the use of Warm Mix Asphalt (WMA), that is, a modifed asphalt concrete that can be produced and applied at lower temperature, is considered an efective solution leading to environmental and operational benefts. Te environmental sustainability of WMA can be further enhanced with the inclusion of steel slag in partial substitution of natural aggregates. Nevertheless, such innovative material applied at lower temperatures containing warm additives and steel slag should be able to guarantee at least the same performance of traditional hot mix asphalts, thus assuring acceptable mechanical properties and durability. Terefore, the purpose of this study is to investigate the rheological behaviour of bituminous mastics obtained combining a warm-modifed binder and a fller (material passing to 0.063 mm) coming from electric arc furnace steel slag. To evaluate the infuence of both warm additive and steel slag, a plain binder and limestone fller were also used for comparison purposes. Complex modulus and permanent deformation resistance of bitumens and mastics were assessed using a dynamic shear rheometer. Experimental results showed that steel slag warm mastics assure enhanced performance demonstrating promising applicability. 1. Introduction Due to continuous increase of trafc loading and taking also into account that the preservation and protection of natural and working environments have become of strategic importance, innovative road materials and products should be considered to enhance environmental sustainability of pavements without afecting (and, actually, improving) their mechanical performance and durability. In this sense, the use of Warm Mix Asphalt (WMA) has gained increasing interest since it is a modifed asphalt concrete, obtained by using diferent types of additives, which can be produced, applied, and compacted at lower tem- peratures (100–140 ∘ C) than hot mix asphalt (HMA). WMA should be able to guarantee environmental benefts (reduced energy consumption, gas and fume emissions) as well as economic/operational advantages such as lower production costs, longer hauling distances, and extended construction periods [1, 2]. Te mechanical properties (benefts and drawbacks) of WMA mixes can vary in a large range mainly depending on the amount of additive and the type of WMA technology used. Wide scientifc literature exists addressing the assessment of mechanical properties and durability of warm-modifed binders and mixtures [2–11]. Including steel slag in substitution of natural aggregates within WMA can further enhance the environmental sus- tainability of such a mixture, since natural resources (natural aggregates) can be saved and industrial waste (steel slag) can be reused. Te interest in ferrous slag as valuable resource for construction applications (including road pavements) is increasing steadily, taking also into account that hundreds of millions of tons of this material is produced worldwide annually afecting the environment [12]. In particular, steel slag is a by-product of the steelmaking and steel refning processes usually categorized based on the type of furnace used. In this sense, the more common steel slags are basic oxygen furnace (BOF) and electric arc furnace (EAF) steel slag [12, 13]. Several studies documenting benefts and draw- backs related to the use of steel slags in road pavements under mechanical, functional, and environmental point of Hindawi Publishing Corporation Advances in Materials Science and Engineering Volume 2016, Article ID 9535940, 11 pages http://dx.doi.org/10.1155/2016/9535940