TY - GEN
T1 - Impact of Asphalt Modifier Dosage on Modified Binder Rheology and Chemistry with Long-Term Aging
AU - Singhvi, Punit
AU - Karakas, Ahmet
AU - Ozer, Hasan
AU - Al-Qadi, Imad L.
AU - Hossain, Kamal
N1 - Publisher Copyright:
© 2019 American Society of Civil Engineers.
PY - 2019
Y1 - 2019
N2 - Asphalt modifiers/additives are increasingly used in pavement industry. Additives are commonly used as softeners to decrease the binder performance grade (PG), while polymer modifiers are usually used for heavy traffic applications to reduce permanent deformations. Recently, rejuvenators have been used in recycled pavement applications to reduce cracking susceptibility and as retarders to moisture damage. These modifiers can be derived from crude petroleum and sometimes from a bio-based feedstock. The origin of crude binder and modifier source affects the resulting binder-modifier chemical interaction. The inherent chemical variability affects the rheological performance of modified binders. It also impacts the aging potential of these binders and thereby affecting its long-term field performance. In this study, binders modified with softeners/rejuvenators at various dosages were evaluated for their performance under long-term aging. Rheological characterization of modified binders was determined using frequency sweep, linear amplitude sweep, and low temperature performance with parameters such as Glover-Rowe, R-value, crossover frequency, ΔTc, while the chemical characteristics were determined using Fourier transform infrared spectroscopy (FTIR), and thin layer chromatography and flame ionization detection (TLC-FID). An optimum dosage of the rejuvenator studied was recommended to maximize performance of the modified binder.
AB - Asphalt modifiers/additives are increasingly used in pavement industry. Additives are commonly used as softeners to decrease the binder performance grade (PG), while polymer modifiers are usually used for heavy traffic applications to reduce permanent deformations. Recently, rejuvenators have been used in recycled pavement applications to reduce cracking susceptibility and as retarders to moisture damage. These modifiers can be derived from crude petroleum and sometimes from a bio-based feedstock. The origin of crude binder and modifier source affects the resulting binder-modifier chemical interaction. The inherent chemical variability affects the rheological performance of modified binders. It also impacts the aging potential of these binders and thereby affecting its long-term field performance. In this study, binders modified with softeners/rejuvenators at various dosages were evaluated for their performance under long-term aging. Rheological characterization of modified binders was determined using frequency sweep, linear amplitude sweep, and low temperature performance with parameters such as Glover-Rowe, R-value, crossover frequency, ΔTc, while the chemical characteristics were determined using Fourier transform infrared spectroscopy (FTIR), and thin layer chromatography and flame ionization detection (TLC-FID). An optimum dosage of the rejuvenator studied was recommended to maximize performance of the modified binder.
KW - Asphalt rheology
KW - asphalt modification
KW - chemical characterization
KW - long-term aging
UR - http://www.scopus.com/inward/record.url?scp=85073910473&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85073910473&partnerID=8YFLogxK
U2 - 10.1061/9780784482469.028
DO - 10.1061/9780784482469.028
M3 - Conference contribution
AN - SCOPUS:85073910473
T3 - Airfield and Highway Pavements 2019: Testing and Characterization of Pavement Materials - Selected Papers from the International Airfield and Highway Pavements Conference 2019
SP - 274
EP - 284
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
T2 - International Airfield and Highway Pavements Conference 2019: Testing and Characterization of Pavement Materials
Y2 - 21 July 2019 through 24 July 2019
ER -