Journal Published Online: 01 February 2022
Volume 50, Issue 3

Rheological Properties of Derivative Fractions Composed of Aromatics, Resins, and Asphaltenes

CODEN: JTEVAB

Abstract

The chemical composition of the asphalt binder determines its rheological and mechanical properties. The objective of this study is to reveal the rheological properties of derivative fractions composed of aromatics, resins, and asphaltenes. First, asphalt binder (pen grade 60/80) was separated into four fractions, and then resins and asphaltenes were doped into aromatics at various contents to fabricate four derivative fractions named AR1, AR2, AAs1, and AAs2. The frequency-temperature sweep was conducted by a dynamic shear rheometer (30∼80°C, 0.01∼20 Hz, and 0.01 % shear strain). The test results showed that with the increase of resins or asphaltenes content, the complex shear modulus increased, the phase angle value reduced, and the glass transition temperature increased, indicating that an increase in polarity led to higher stiffness and elasticity. The separated and derivative fractions in this study have been proved as thermo-rheologically simple materials due to their smooth Black diagram curves and master curves. Saturates with simple aliphatic chains had a constant phase angle value regardless of temperature and frequency. Aromatics, resins, and derivative fractions had a similar Black diagram and master curve shape characterized by a plateau region in the phase angle values. Moreover, the reduced frequency at phase angle plateau shifted from high to low frequency when the asphaltenes content increased.

Author Information

Wang, Jiayu
Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai, China
Xiao, Feipeng
Key Laboratory of Road and Traffic Engineering of Ministry of Education, Road and Airport Engineering, Tongji University, Shanghai, China
Pages: 15
Price: $25.00
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Stock #: JTE20210218
ISSN: 0090-3973
DOI: 10.1520/JTE20210218