Rheological Properties of Modified Coal Tar Pitches
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 3
Abstract
Different modifiers composed of polyethylene glycol, paraformaldehyde, polystyrene, and polyphosphoric acid at different ratios (designated CD-0, CD-1, CD-2. CD-3, and CD-4) were added to coal tar pitch. The resulting modified pitches were prepared and designated control D-0 and D-1, D-2, D-3, and D-4, correspondingly. The objective of this study was to evaluate the properties of the control and modified coal tar pitches by the dynamic shear rheometer (DSR) test and microscopic imaging technology. The complex shear modulus and phase angle of the modified coal tar pitches decreased with increased temperature, which indicated a decline in the gradual capacity for resistance to permanent deformation at high temperatures. There was good correlation between the Christensen-Andersen-Marasteanu (CAM) model and the complex modulus master curve of the modified coal tar pitches. The test results showed that D-4 had a higher complex viscosity than that of the control D-0 and the other modified coal tar pitches (D-1, D-2, and D-3), along with a higher glassy complex modulus , cross frequency , rheological parameter , and better resistance to rheological deformation. Control D-4 also had a strong capability to resist high-temperature permanent deformation. In addition, the homogeneity of D-4 was better than that of the control D-0 and the other modified pitches, as observed in microscopic images. Therefore, it could be concluded that D-4 had better properties compared with the others.
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Acknowledgments
This paper was supported by the Importation and Development of the High-Caliber Talents Project of Beijing Municipal Institutions (Grant No. PXM2013-014210-000165) and the National Natural Science Foundation of China (Grant No. 51478028).
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 3 • March 2017
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© 2016 American Society of Civil Engineers.
History
Received: Feb 29, 2016
Accepted: Jun 22, 2016
Published online: Aug 24, 2016
Discussion open until: Jan 24, 2017
Published in print: Mar 1, 2017
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