Modification and Recycling Complexity of the Bitumen Modified with SBS Polymer-A Review.

This paper presents a comprehensive review of bituminous binder modification using Styrene-Butadiene-Styrene (SBS) copolymer. Bitumen is one of the most widely used binder types in road engineering, and its modification has been extensively studied to enhance performance characteristics. The review outlines the historical development of bitumen modification, discusses binder structural models, and examines the influence of SBS on binder properties. The review focuses on ageing process of Polymer-Modified Bitumen (PMB) and Highly Modified Bitumen (HiMA). The complexity of binder's origin, polymer structure, ageing factors and the presence of cross-linking agents or other compounds creates significant challenges in predicting binder performance after technological and exploitation ageing. This uncertainty directly affects the assessment of long-term durability and recycling potential. Therefore, it is relevant to incorporate a broader range of ageing factors into standardized laboratory testing procedures to develop effective rejuvenation strategies for SBS-modified PMBs.