Semnan University Press Journal of Transportation Infrastructure Engineering 2423-5350 4 3 2018 11 22 The Effect of Polymer Blends on Fatigue of Asphalt Mixtures The Effect of Polymer Blends on Fatigue of Asphalt Mixtures 1 14 3103 10.22075/jtie.2018.15204.1323 FA Mostafa Vamegh PhD Candidate, School of Civil Engineering, Iran University of Science and Technology, Tehran, I. R. Iran. Mahmoud Ameri Professor, School of Civil Engineering, Iran University of Science and Technology, Tehran, I. R. Iran. Sayed Farhad Chavoshian Naeni MSc. Student, School of Civil Engineering, Iran University of Science and Technology, Tehran, I. R. Iran. Mohamad Hasan Mirabimoghadam Assistant Professer, Civil Engineering Departemrnt, University of Sistan and Baluchestan, Zahedan, I. R. Iran. Journal Article 2018 06 23 Damage in asphalt pavements due to repetitive stresses and strains caused by both traffic loading and environmental factors can manifest itself as fatigue and thermal cracking, respectively. Cracking is considered as a primary distress mechanism in asphalt pavements. Many studies have been carried out on resolving these distresses. One of these ways is the use of polymer modifiers to improve the properties of asphalt binder and asphalt mixtures. Therefore, this research was conducted to study the effects of domestic polymers (with trade names of SBR and PP) in equal proportions on the fatigue properties of asphalt mixtures compared to expensive imported polymer (called SBS). Accordingly, four-point beam fatigue and indirect resilient modulus tests were carried out. It was found that combination of PP and SBR leads to better preservation of fatigue performance of modifed mixes and increases the fatigue life up to 50% compared to SBS-modified mix. Consequently, such polymers combination can be more beneficial than using SBS polymer. Damage in asphalt pavements due to repetitive stresses and strains caused by both traffic loading and environmental factors can manifest itself as fatigue and thermal cracking, respectively. Cracking is considered as a primary distress mechanism in asphalt pavements. Many studies have been carried out on resolving these distresses. One of these ways is the use of polymer modifiers to improve the properties of asphalt binder and asphalt mixtures. Therefore, this research was conducted to study the effects of domestic polymers (with trade names of SBR and PP) in equal proportions on the fatigue properties of asphalt mixtures compared to expensive imported polymer (called SBS). Accordingly, four-point beam fatigue and indirect resilient modulus tests were carried out. It was found that combination of PP and SBR leads to better preservation of fatigue performance of modifed mixes and increases the fatigue life up to 50% compared to SBS-modified mix. Consequently, such polymers combination can be more beneficial than using SBS polymer. https://jtie.semnan.ac.ir/article_3103_b48d2486cc40f06d315badd27653fd46.pdf