Rheological Properties at Low Temperatures and Chemical Analysis of a Composite Asphalt Modified with Polyphosphoric Acid
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 5
Abstract
This work improved the low-temperature rheological properties of asphalt modified with styrene butadiene styrene (SBS) using an acid modifier, namely polyphosphoric acid (PPA), and investigated the microstructural changes induced by such a modification. Four mass fractions of acid modifier were added into SBS modified asphalt (polymer-modified asphalt, PG 64-28). A bending beam rheometer (BBR) and Fourier-transform infrared spectroscopy (FTIR) were used to obtain the creep stiffness, the -value, and the microstructure distribution of the modified asphalt binders. Then the fractional viscoelasticity model was used to calculate the damping ratio, , and the dissipation energy ratio, , of the modified composite asphalt. The creep stiffness and the -value of the composite asphalt increased, compared with those of SBS-modified asphalt, but this trend was largely affected by temperature. The differences in the calculated results suggest that the addition of the acid modifier to the SBS-modified asphalt enhanced the viscous properties at low temperatures ().
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The experimental work was supported by the National Natural Science Foundation of China (Grant No. 51778541) and completed in the Highway Engineering Key Laboratory of Sichuan Province at Southwest Jiaotong University. The FTIR measurements were performed at the School of Life Science and Engineering at Southwest Jiaotong University.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 5 • May 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: May 9, 2019
Accepted: Sep 13, 2019
Published online: Feb 20, 2020
Published in print: May 1, 2020
Discussion open until: Jul 20, 2020
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