Evaluation of High-Performance Asphalt Binders Modified with SBS, SIS, and GTR

Hyun Hwan Kim,Mithil Mazumder,Moon-Sup Lee,Soon-Jae Lee

doi:10.1155/2019/2035954

Abstract

In this study, performance properties of polymer-modified asphalt (PMA) binders are evaluated depending on ground tire rubber (GTR) and styrene-isoprene-styrene (SIS). Styrene-butadiene-styrene- (SBS-) modified asphalt binder of PG 76-22 is used as a base binder to manufacture the rubberized PMA binder. The rubberized PMA binders are blended using SIS modifier. The binders were artificially short-term and long-term aged using rolling thin-film oven (RTFO) and pressure aging vessel (PAV) procedures. Superpave binder tests were conducted on the binders through rotational viscometer (RV), dynamic shear rheometer (DSR), and bending beam rheometer (BBR). Furthermore, multiple stress creep recovery (MSCR) test and atomic force microscopy (AFM) microstructural analysis were performed. The results of this study indicated that (1) the viscosity properties seem to be highly dependent on GTR and SIS contents, (2) the addition of SIS is observed to have a significant effect on improving the rutting performances of rubberized PMA binders, (3) the cracking properties are considered to be improved significantly through SIS modification, and (4) in general, the rubberized PMA binders with SIS showed the best performance for rutting and cracking among all the binders used in this study.

Highlights

Asphalt pavements are getting exposed to more extreme traffic conditions such as higher traffic volume and heavier loads
E purpose of this study is to evaluate the polymer-modified asphalt (PMA) binders containing SBS, SIS, and ground tire rubber (GTR) modifiers. e binders were aged through the rolling thin-film oven (RTFO) and pressure aging vessel (PAV) procedures
The PG76-22 with SIS showed higher viscosities compared to the base PMA binder. e addition of SIS content of 5% is

Summary

Introduction

Asphalt pavements are getting exposed to more extreme traffic conditions such as higher traffic volume and heavier loads. SBS is one of the most common materials which produce high-quality polymer-modified asphalt (PMA) binder [1]. SBS-modified binder is known to be durable pavement material which has improved bonding strength with aggregate based on a three-dimensional network [2]. Addition of GTR improves the rutting property due to increased stiffness and elasticity at a high temperature. It extends the fatigue life of mixture through enhanced asphalt film which coated the aggregate in the mixture [5, 6]. E modified binders showed enhanced performances for both high- and low-temperature rheological properties. The multiple stress creep recovery (MSCR) test was applied to more effectively evaluate the rutting property of the rubberized PMA binder.

Experimental Design

Results and Discussion

Summary and Conclusions