Utility of polyparaphenylene terephtalamide ﬁber in hot mix asphalt as a ﬁber N. Morova a,⇑ , S. Serin b , S. Terzi c , M. Saltan c , D. Ozdemir Kucukcapraz d , S. Sargin Karahancer c , E. Eriskin c a Süleyman Demirel University, Faculty of Technology, Manufacturing Eng. Dep., Isparta, Turkey b Düzce University, Faculty of Technology, Civil Engineering Department, Düzce, Turkey c Süleyman Demirel University, Faculty of Engineering, Civil Engineering Department, Isparta, Turkey d Süleyman Demirel University, Faculty of Engineering, Textile Engineering Dep., Isparta, Turkey highlights  In this study, utility of PT as ﬁber in HMA is researched.  The optimum bitumen content is determined as 4.65% by Marshall Stability test.  Samples with different bitumen contents, and different ﬁber rates was produced.  Optimum stability is obtained from 4.65% bitumen content and 0.25% ﬁber rate. graphical abstract Flow chart of the study Determining Optimum Bitumen Content of Aggregate Type BC (3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%) FR (0%) 4.65% BC Determining Optimum Fiber Rate for Optimum Bitumen(4.65%) FR (0.25%, 0.5%, 0.75%, 1.0%, 1.5%, 2%) BC (4.65%) 0.25% FR Determining Optimum Fiber Rate and Optimum Bitumen Content for Other Bitumen Content BC (4.15%, 4.65%, 5.15%) FR (0.25%, 0.5%, 0.75%) 0.25% FR 4.65% BC BC: Bitumen Content FR: Fiber Rate article info Article history: Received 25 April 2015 Received in revised form 29 December 2015 Accepted 30 December 2015 Keywords: Polyparaphenylene terephtalamide ﬁber (PTF) Hot mix asphalt Marshall Stability Indirect Tensile Strength abstract In this study, utility of polyparaphenylene terephtalamide (PT) was investigated in hot mix asphalt as a ﬁber. For this aim samples were prepared with limestone aggregate at different proportions. Marshall Stability test was applied and optimum bitumen content was determined. In the second stage of the study, new samples were prepared using different polyparaphenylene terephtalamide ﬁber (PTF) rates of 0.25%, 0.50%, 0.75%, 1.00%, 1.50%, 2.00% based on optimum bitumen content. When examining test results, samples which prepared using 0.25% PTF rate gave highest Marshall Stability result. At the ﬁnal stage of the study, different bitumen contents (4.15%, 4.65% and 5.15%) were conducted for the best ﬁber rate (0.25%) and close to this result (0.50% and 0.75%). Thus, the effect of bitumen content on determined ﬁber rate at the second stage of the study was investigated. Also Indirect Tensile (IDT) Strength Test was performed on hot mix asphalt (HMA) samples preparing at 0.25%, 0.50% and 0.75% ﬁber rates and mois- ture sensitivities were determined. All results showed that, the best ﬁber rate was 0.25% and determined optimum bitumen content remain constant with the ﬁber additive for the reference samples. Besides, some sample groups which prepared using different PTF rates proved the speciﬁcation limits and it was said that; PTF can be used in asphalt concrete as a ﬁber additive. Ó 2015 Elsevier Ltd. All rights reserved. http://dx.doi.org/10.1016/j.conbuildmat.2015.12.193 0950-0618/Ó 2015 Elsevier Ltd. All rights reserved. ⇑ Corresponding author. E-mail addresses: nihatmorova@sdu.edu.tr (N. Morova), sercanserin@duzce.edu. tr (S. Serin), serdalterzi@sdu.edu.tr (S. Terzi), mehmetsaltan@sdu.edu.tr (M. Saltan), diclekucukcapraz@sdu.edu.tr (D. Ozdemir Kucukcapraz), sebnemsargin@sdu.edu.tr (S. Sargin Karahancer), ekinhaneriskin@sdu.edu.tr (E. Eriskin). Construction and Building Materials 107 (2016) 87–94 Contents lists available at ScienceDirect Construction and Building Materials journal homepage: www.elsevier.com/locate/conbuildmat