Microstructure and rheological response of laboratory-aged SBS-modified bitumens

Davide Lo Presti, Massimo Losa, Davide Lo Presti, Giacomo Cuciniello, Giovanni Polacco, Pietro Leandri, Gordon Airey, Sara Filippi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Polymer additives are widely used to improve the performance of road bitumens including their 12 Microstructure and rheological response of laboratory-aged SBS-modified bitumens microstructure, and rheological properties of Polymer Modified Bitumens (PMBs) prepared with resistance to hardening during oxidation, although their oxidative inhibitor effect has not been well documented. This study aims to investigate the effect of laboratory-simulated ageing on the microstructure, and rheological properties of Polymer Modified Bitumens (PMBs) prepared with a Styrene-Butadiene-Styrene (SBS) copolymer and sulphur as a cross-linker. The laboratory ageing was conducted through the Rolling Thin Film Oven (RTFO) and the Pressure Aging Vessel (PAV) procedures. The unaged and aged binders were characterised using the Multiple Stress Creep and Recovery (MSCR) test, Gel Permeation Chromatography (GPC) and fluorescence microscopy. The MSCR test showed that the cross-linked polymer had a higher capability of mitigating the effect of bitumen hardening on the rheological response, while for the PMBs without cross-linking, the polymer effects decreased significantly after RTFOT ageing. The GPC results [...] ageing. Similar behaviour was observed for the uncross-linked polymer binders, while for the cross-linked polymer binder, the behaviour depended on the polymer concentration.
Original languageEnglish
Pages (from-to)372-396
Number of pages25
JournalRoad Materials and Pavement Design
Volume22
Publication statusPublished - 2021

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering

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