TY - JOUR
T1 - Ageing characteristics of polyethylene-modified asphalt binders blended with different compatibilisers
AU - Roja, K. Lakshmi
AU - Masad, Eyad
AU - Krishnamoorthy, Senthil Kumar
AU - Ouederni, Mabrouk
N1 - Publisher Copyright:
© 2023 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
PY - 2023
Y1 - 2023
N2 - In this study, virgin low-density polyethylene (LDPE) and recycled polyethylene (RPE) were blended with an asphalt binder in combination with compatibilizers such as styrene-butadiene-styrene (SBS), Elvaloy, sulfur, and polyphosphoric acid (PPA): LDPE, LDPE + SBS + Sulfur, LDPE + Elvaloy, LDPE + Elvaloy + PPA, LDPE + sulfur, RPE, RPE + sulfur, and RPE + PPA. This study aimed to investigate (1) the distribution of PE in asphalt binder, (2) chemical changes in the binder due to the addition of compatibilizers, and (3) the ageing characteristics and their effects on the rheological and performance properties. Micrographs revealed that the LDPE dispersity improved with the addition of Elvaloy. The PE blends with sulfur met the target performance grade of PG76V-10. The PE blends with sulfur exhibited the highest fatigue life at low strain levels and degraded rapidly with an increase in strain level. The LDPE blends with Elvaloy experienced the least degradation in fatigue life with an increased strain level; this low ageing susceptibility was due to the lowest carbonyl (I c=o) and sulfoxide (I s=o) index values.
AB - In this study, virgin low-density polyethylene (LDPE) and recycled polyethylene (RPE) were blended with an asphalt binder in combination with compatibilizers such as styrene-butadiene-styrene (SBS), Elvaloy, sulfur, and polyphosphoric acid (PPA): LDPE, LDPE + SBS + Sulfur, LDPE + Elvaloy, LDPE + Elvaloy + PPA, LDPE + sulfur, RPE, RPE + sulfur, and RPE + PPA. This study aimed to investigate (1) the distribution of PE in asphalt binder, (2) chemical changes in the binder due to the addition of compatibilizers, and (3) the ageing characteristics and their effects on the rheological and performance properties. Micrographs revealed that the LDPE dispersity improved with the addition of Elvaloy. The PE blends with sulfur met the target performance grade of PG76V-10. The PE blends with sulfur exhibited the highest fatigue life at low strain levels and degraded rapidly with an increase in strain level. The LDPE blends with Elvaloy experienced the least degradation in fatigue life with an increased strain level; this low ageing susceptibility was due to the lowest carbonyl (I c=o) and sulfoxide (I s=o) index values.
KW - Polyethylene-modified asphalt binder
KW - ageing resistance
KW - chemical analysis
KW - compatibility
KW - microscopy
KW - rheology
UR - http://www.scopus.com/inward/record.url?scp=85149486678&partnerID=8YFLogxK
U2 - 10.1080/14680629.2023.2181123
DO - 10.1080/14680629.2023.2181123
M3 - Article
AN - SCOPUS:85149486678
SN - 1468-0629
VL - 24
SP - 672
EP - 689
JO - Road Materials and Pavement Design
JF - Road Materials and Pavement Design
IS - S1
ER -