Research Article Assessing Mechanical Properties of Hot Mix Asphalt with Wire Wool Fibers Ahmed N. Bdour, 1 Yahia Khalayleh, 1 and Aslam A. Al-Omari 2 1 Civil Engineering Department, College of Engineering, Te Hashemite University, Zarqa 13115, Jordan 2 Civil Engineering Department, College of Engineering, Jordan University of Science and Technology, Irbid 22110, Jordan Correspondence should be addressed to Ahmed N. Bdour; bdour@hu.edu.jo Received 4 March 2015; Revised 20 April 2015; Accepted 4 May 2015 Academic Editor: Serji N. Amirkhanian Copyright © 2015 Ahmed N. Bdour 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. Tis paper investigates the potential application of wire wool in the modifcation of hot asphalt mixes (HMA). Wire wool material is widely available at local markets as a by-product of wire wool industry and as waste products from homes. For the purpose of this study, wire wool was cut into small pieces so that it can be placed in the asphalt mixes. Diferent percentages of wire wool were incorporated with the hot asphalt mixes (0.0%, 0.25%, and 0.5%) of the total weight of the asphalt binder. Various experimental tests were used to evaluate the modifcation efectiveness of combining wire wool with hot asphalt mixes, namely, the Marshall Stability, indirect tensile strength (ITS), dynamic creep, fatigue, and rutting tests. Test results proved that the addition of wire wool increased the tensile strength of the asphalt concrete mixes. However, rutting increased due to increasing percentage of wire wool. Terefore, mixes containing wire wool can be used in areas where rutting is not the expected predominant distress type. 1. Introduction Asphalt concrete mixes have attracted many researchers and engineers trying to improve their dynamic properties due to the growth in trafc volume, trafc loading and tire pressure, and harsh environments which have ultimately increased stresses on asphalt pavements [1–4]. Huge trafc loading and harsh environments were two key parameters that afect mechanical and dynamic proper- ties of HMA pavement. Early signs of cracks and deteriora- tion were shown on the pavement as major consequences of these parameters. Commonly, local pavement temperatures range between -7 ∘ C during winter season and up to 48 ∘ C during summer time. In addition, temporal temperature fuc- tuations (daily and seasonally) and the rapid increase in trafc volume and loading have put more stress on HMA pavement. Terefore, there is a great need to modify and improve HMA mixes to diminish stress cracking and permanent deforma- tion which occur at low and high temperature ranges, respec- tively. Modifcations of the asphalt binders were the main approaches taken to improve the performance of asphalt pavement. Many researchers have performed investigations to improve and upgrade properties of HMA mixes [5]. On the contrary, other researchers have studied improving prop- erties of HMA mixes by utilizing recycled additives such as fbers and polymers. A rigorous literature review showed that the increase in the interests of researchers in the feld of HMA mixes enhancement was due to many reasons, such as (a) pavement distresses and early cracks which resulted from growing trafc volumes, loads, and tire pressure, (b) eco- nomic aspects associated with rehabilitation and replacement of deteriorated pavement specially oil refneries’ policy in favor of producing light fuels instead of asphalt, (c) new trend towards constructing roads with thin pavement thickness and difered maintenance procedures, (d) availability of by- product waste materials which encourages researchers and environmentalists to utilize them in various environmental friendly ways to reduce their hazards, and (e) persistent temperature fuctuations which lead to distressing pavement and produce permanent deformations [3]. Te prominences of researchers are to a safe disregard of the by-product wastes by incorporating them as HMA additives to improve dynamic and mechanical pavement or binders’ properties [6]. It is well illustrated in the literature that using the additives of such wastes in the HMA binders Hindawi Publishing Corporation Advances in Civil Engineering Volume 2015, Article ID 795903, 6 pages http://dx.doi.org/10.1155/2015/795903