Laboratory evaluation of the composition of nano-clay, nano-lime and SBS modifiers on rutting resistance of asphalt binder Seyed Alireza Ghanoon a , Javad Tanzadeh b,⇑ , Mehrnaz Mirsepahi c a Department of Civil Engineering, South Tehran Branch, Islamic Azad University, Tehran, P.O. Box: 11365-4435, Iran b Department of Civil Engineering, Bandar Anzali Branch, Islamic Azad University, Bandar Anzali, P.O. Box: 43111, Iran c Department of Road and Transportation, Science and Research Branch Islamic Azad University, Tehran, Iran highlights  The effect of nano-lime is greater than of nano clay in composite combination.  Temperature increase in both high and low stresses increased the values of the non-recoverable creep compliance.  The combination of this additives can increase the bitumen yield results dramatically.  Nano-clay can improve the storage stability and temperature susceptibility of polymer modified bitumen.  Nano-clay increases rutting resistance and reduces its stress sensitivity at tolerance temperature. article info Article history: Received 5 August 2019 Received in revised form 1 November 2019 Accepted 11 November 2019 Keywords: Bitumen Nano-clay Nano-lime SBS MSCR Rutting Asphalt binder Non-recoverable creep compliance Recovered creep Stress sensitivity Compound modifiers abstract The physical and rheological properties of asphalt mixtures affect pavement performance at high and low ambient temperatures, and thus can affect the final performance of the mixture. Adding modifiers such as polymers and nano additives to improve asphalt mixture performance has become popular in recent years. The purpose of this study is to modify the bitumen with nano-clay, nano-lime and Styrene- Butadiene-Styrene (SBS). PG 64-22 bitumen was modified using 2, 4 and 6 wt% of nano-clay and the results showed that increasing the nano-clay to the base bitumen improved the rheological properties and rutting resistance of asphalt binder. Also, it was examined the effect of adding 3% SBS to the bitumen sample, and the results indicated a positive effect of this additive, especially at lower temperatures. In the next step, bitumen was modified using 4 and 6 wt% of nano-lime and 3% SBS with 4 and 6 wt% of nano- clay in combination with the base bitumen and tested to evaluate the combined effect of these three materials. The effect of this modifier on reducing rutting failure was evaluated compared to the control sample. To this end, we evaluated the effect of these materials on the rheological properties of bitumen by performing multiple stress creep recovery (MSCR) test by Dynamic Shear Rheometer (DSR). Results showed that increasing the nano-clay to the base bitumen improved the rheological properties and rut- ting resistance of asphalt binder and best improvement is achieved with 6%. The effect of 3% SBS although did not produce results similar to nano-clay, but the results showed significant improvement in bitumen properties. Finally, the best combination in this study was a combination of 3% SBS, 4% nano-clay, and 6% nano-lime, which yielded good results. Ó 2019 Elsevier Ltd. All rights reserved. 1. Introduction One of the most important forms of failure in asphalt pavement is stretching or permanent rutting. Permanent deformation along the horizontal track of the wheel appears at the longitudinal sur- face, which results in reduced pavement efficiency and makes the vehicles rough and dangerous [1]. The main reason for the asphalt pavement track is the known ‘‘accumulated strain” that results from traffic loading [2]. Although the rutting observed in the flexible pavements can be calculated by aggregating the total of the tensile accumulated in single or multilayer, but the accumu- lation of stable tensile stress in the surface layer of the asphalt mix- ture is considered as the main source of rutting [3]. The aptitude of rutting in a pavement is largely influenced by its grading and mix- ing properties. However, bitumen properties are also important, https://doi.org/10.1016/j.conbuildmat.2019.117592 0950-0618/Ó 2019 Elsevier Ltd. All rights reserved. ⇑ Corresponding author. E-mail addresses: St_ar_ghanoon@azad.ac.ir (S.A. Ghanoon), Tanzadeh@iaubanz. ac.ir (J. Tanzadeh). Construction and Building Materials 238 (2020) 117592 Contents lists available at ScienceDirect Construction and Building Materials journal homepage: www.elsevier.com/locate/conbuildmat