Destruction and Recovery of Internal Structure in Polymer-Modified Asphalts
Publication: Journal of Materials in Civil Engineering
Volume 19, Issue 3
Abstract
Nowadays, asphalt cement is frequently modified by blending it with various polymers in order to obtain a material with improved engineering properties. In number of studies it has been shown that ethylene-vinyl-acetate (EVA) and styrene-butadiene-styrene (SBS) copolymers can enhance the rheological properties of conventional asphalt at relatively wide range of temperatures. It is believed that when polymer is added to the base asphalt it absorbs low molecular weight oil fraction of asphalt and swells, thus forming a three-dimensional network structure. The properties of this structure determine the rheological behavior of polymer-modified asphalt. Asphalt modified by SBS and EVA copolymers (concentrations from 2 to 8% by weight) was investigated in dynamic mechanical analysis and interrupted shear flow tests. The interrupted shear test involves two phases of shearing (stress growth and flow relaxation in between) with varying rest periods between the two shear phases. All the tests were performed at in strain control rotational viscometer. The destruction and reformation of the internal network structure of polymer-modified asphalts can be demonstrated in this test.
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Acknowledgments
The writers would like to express their gratitude to the Natural Sciences and Engineering Research Council of Canada (NSERC) and to Husky Energy Inc. for their financial support of this work.
References
Becker, Y. M., Muller, A. J., and Rodriguez, Y. (2003). “Use of rheological compatibility criteria to study SBS modified asphalts.” J. Appl. Polym. Sci., 90(7), 1772–1782.
Bonemazzi, F., Braga, V., Corrieri, R., Giavarini, C., and Sartori, F. (1996). “Characteristics of polymers and polymer-modified binders.” Transportation Research Record. 1535, Transportation Research Board, Washington, D.C., 36–47.
Breysse, D., De la Roche, C., Domec, V., and Chauvin, J. J. (2003). “Influence of rest time on recovery and damage during fatigue tests on bituminous composites.” 6th Int. RILEM Symp. of PTEBM, Zurich, Switzerland.
Chen, J.-S., Liao, M.-C., and Shiah, M.-S. (2002). “Asphalt modified by styrene-butadiene-styrene triblock copolymer: Morphology and model.” J. Mater. Civ. Eng., 14(3), 224–229.
Collins, J. H., Bouldin, M. G., Gelles, R., and Berker, A. (1991). “Improved performance of paving asphalts by polymer modification.” Asphalt Paving Technol., 60, 43–77.
Dealy, J. M., and Tsang, WM. K. W. (1981). “Structural time dependency in the rheological behavior of molten polymers.” J. Appl. Polym. Sci., 26(4), 1149–1158.
Dickinson, E. J. (1981). “Assessment of the deformation and flow properties of the polymer-modified paving bitumens.” Aust. Road Res., 11(3), 11–17.
Ferry, J. D. (1961). Viscoelastic properties of polymers, Wiley, New York.
Gardiner, M. S., and Newcomb, D. E. (1995). “Polymer literature review.” Rep. No. 95-27, Minnesota Department of Transportation, St. Paul.
Hesp, S. A. M., Terlouw, T., and Vonk, W. C. (2000). “Low temperature performance of SBS-modified asphalt mixes.” Asphalt Paving Technol., 69, 540–568.
Ho, S., Zanzotto, L., and Macleod, D. (2002). “Low temperature performance grade of conventional and polymer-modified asphalt binders.” Proc., CTAA, Calgary, Alta, Canada, 73–89.
Isacsson, U., and Lu, X. (1999). “Laboratory investigation of polymer-modified bitumens.” Asphalt Paving Technol., 68, 35–63.
Lu, X., and Isacsson, U. (2001). “Modification of road bitumens with thermoplastic polymers.” Polym. Test., 20(1), 77–86.
Maccarrone, S., Holleran, G., and Gnanaseelan, G. P. (1995). “Properties of polymer-modified binders and relationship to mix and pavement performance.” Asphalt Paving Technol., 64, 209–236.
Rozeveld, S. J., Shin, E. E., Bhurke, A., France, L., and Drzal, L. T. (1997). “Network morphology of straight and polymer-modified asphalt cements.” Microsc. Res. Tech., 38(5), 529–543.
Santangelo, P. G., and Roland, C. M. (2001). “Interrupted shear flow of unentangled polystyrene melts.” J. Rheol., 45(2), 583–594.
Shin, E. E., Bhurke, A., Scott, E., Rozeveld, S., and Drzal, L. T. (1996). “Microstructure, morphology, and failure modes of polymer-modified asphalts.” Transportation Research Record. 1535, Transportation Research Board, Washington D.C., 61–73.
Stratton, R. A., and Butcher, A. F. (1973). “Stress relaxation upon cessation of steady flow and the overshoot effect of polymer solutions.” J. Polym. Sci., Polym. Phys. Ed., 11(9), 1747–1758.
Uddin, W. (2003). “Viscoelastic characterization of polymer-modified asphalt binders of pavement applications.” Appl. Rheol., 13(4), 191–199.
Usmani, A. M., ed. (1997). Asphalt science and technology, Marcel Dekker, New York.
Wardlaw, K. R., and Shuler, S., ed. (1992). “Polymer-modified asphalt binders.” ASTM STP 1108, Philadelphia.
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© 2007 ASCE.
History
Received: Jun 9, 2005
Accepted: Jan 19, 2006
Published online: Mar 1, 2007
Published in print: Mar 2007
Notes
Note. Associate Editor: Mary Stroup-Gardiner
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