TY - GEN
T1 - Mechanical and Microstructural Properties of Asphalt Binders Containing Various Proportions of Reclaimed Asphalt Pavement (RAP)
AU - Roja, K. Lakshmi
AU - Yiming, Wubulikasimu
AU - Masad, Eyad
N1 - Publisher Copyright:
© 2019 American Society of Civil Engineers.
PY - 2019
Y1 - 2019
N2 - This study aims to characterize the mechanical and microstructural properties of asphalt binders prepared with 25 and 35% of RAP contents. A base binder of pen 60/70 (PG 64-22) was used in this study. The binders were characterized by conducting performance grading, multiple stress creep recovery, and frequency sweep tests. The performance of RAP blended binders were compared with the control binder. In addition, microstructural investigation was carried out using an atomic force microscope (AFM) to evaluate the mixing and adhesion between the conventional and recycled binder. From the rheological studies, the dynamic modulus of binder increased with an increase in RAP proportion. The binder testing results showed higher rut resistance characteristics for 35% RAP binder compared to 25% RAP and control binders. In microscopic studies, as the proportion of RAP increased from 0 to 35%, the surface roughness increased and the phase contrast decreased. The results of this study would be of value to the highway authorities and contractors as they move towards adopting more RAP material in the construction of asphalt pavements.
AB - This study aims to characterize the mechanical and microstructural properties of asphalt binders prepared with 25 and 35% of RAP contents. A base binder of pen 60/70 (PG 64-22) was used in this study. The binders were characterized by conducting performance grading, multiple stress creep recovery, and frequency sweep tests. The performance of RAP blended binders were compared with the control binder. In addition, microstructural investigation was carried out using an atomic force microscope (AFM) to evaluate the mixing and adhesion between the conventional and recycled binder. From the rheological studies, the dynamic modulus of binder increased with an increase in RAP proportion. The binder testing results showed higher rut resistance characteristics for 35% RAP binder compared to 25% RAP and control binders. In microscopic studies, as the proportion of RAP increased from 0 to 35%, the surface roughness increased and the phase contrast decreased. The results of this study would be of value to the highway authorities and contractors as they move towards adopting more RAP material in the construction of asphalt pavements.
UR - http://www.scopus.com/inward/record.url?scp=85073907135&partnerID=8YFLogxK
U2 - 10.1061/9780784482469.030
DO - 10.1061/9780784482469.030
M3 - Conference contribution
AN - SCOPUS:85073907135
T3 - Airfield and Highway Pavements 2019: Testing and Characterization of Pavement Materials - Selected Papers from the International Airfield and Highway Pavements Conference 2019
SP - 295
EP - 301
BT - Airfield and Highway Pavements 2019
A2 - Al-Qadi, Imad L.
A2 - Ozer, Hasan
A2 - Loizos, Andreas
A2 - Murrell, Scott
PB - American Society of Civil Engineers (ASCE)
T2 - International Airfield and Highway Pavements Conference 2019: Testing and Characterization of Pavement Materials
Y2 - 21 July 2019 through 24 July 2019
ER -