Investigation on the rheological behaviour and ageing characteristics of crumb rubber and polyurethane blends under dynamic shear conditions
Küçük Resim Yok
Tarih
2025
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Taylor & Francis Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
This study aims to investigate the effects of the use of crumb rubber (CR) with polyurethane (PU) in bitumen modification on rheological and ageing properties. A novel modified palm-oil-based polyol was reacted with 4,40-diphenylmethane diisocyanate (MDI) to synthesise a polyurethane-derived polymer. Multiple stress creep recovery (MSCR), single point and frequency sweep tests were carried out. The analysis of the binders' viscoelastic behaviour was conducted using the Christensen-Anderson (CA) model. The complex viscosity was modelled using the Cross model. The low-temperature behaviour of the binders was determined by the bending beam rheometer (BBR) test, and the mixing-compaction temperatures were determined by the steady shear flow (SSF) method. Compared to single CR modification, the use of 4% PU in combination with 8% CR (8C + 4P) was found to broaden the relaxation spectrum, increase stiffness, improve shear-thinning resistance, and lead to a notable increase in resistance against ageing. Due to the polymeric networks developed in the 8C + 4P binder, it was determined that it exhibits superior elastic properties at high temperatures and also offers improved durability against low-temperature cracks. It was ascertained that the 8C + 4P binder demonstrated superior performance in both low- and high-temperature conditions compared to the 4% SBS modification, while there was no significant difference in terms of production temperatures.
Açıklama
Anahtar Kelimeler
Bitumen, modification, ageing, polyurethane, crumb rubber, modelling
Kaynak
International Journal of Pavement Engineering
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
26
Sayı
1
