IDENTIFYING THE PERFORMANCE PROPERTY OF MODIFIED BINDER AND MIXES CONTAINING DIFFERENT SBS CO-POLYMER

Abstract

The study aims to evaluate the benefits of Styrene-Butadiene-Styrene (SBS). SBS additive modifies the property of asphalt mixes and improves the resistance to aging, rutting, cracking, and fatigue. SBS also increases the service life of the asphalt pavement with the minimal maintenance cost of pavement. The performance of asphalt mix with standard polymer modified binder (PMB), properties using three commercial-grade (Kraton's linear triblock: D1101, branched triblock: D1184, and linear di-block: D0243) SB polymers with similar composition (styrene/butadiene ratio: 30/70) but varying SBS content (3%, 4.5%, and 7% by weight) was compared and analysed through the laboratory investigations which were carried out to find out the various engineering properties such as Marshall properties using modified Marshall Method, Tensile Strength Ratio, Temperature Susceptibility and Resilient Modulus ratio for polymer modified asphalt concrete mixes (PMAC). Results showed that the B-SBS having a binder content of 4.5%, has the highestMarshall quotient (MQ) and Marshall stability (MS) of any SBS grade tested, followed by the L-SBS and DB-SBS. The findings from the study are that B-SBS provides the highest performance properties in terms of maximum G*/Sinδ and the lowest phase angle of the modified binder among the examined polymers. Results also illustrate that asphalt mixes prepared with branched polymer have the highest tensile strength and moisture resistance qualities, followed by linear and Di-block SBS.