Investigation of Physical Properties of Asphalt Binder Modified by Recycled Polyethylene and Ground Tire Rubber

Authors: Sajjad H. Kasanagh, Perviz Ahmedzade, Alexander Fainleib, Taylan Gunay

Abstract:

Modification of asphalt is a fundamental method around the world mainly on the purpose of providing more durable pavements which lead to diminish repairing cost during the lifetime of highways. Various polymers such as styrene-butadiene-styrene (SBS) and ethylene vinyl acetate (EVA) make up the greater parts of the all-over asphalt modifiers generally providing better physical properties of asphalt by decreasing temperature dependency which eventually diminishes permanent deformation on highways such as rutting. However, some waste and low-cost materials such as recycled plastics and ground rubber tire have been attempted to utilize in asphalt as modifier instead of manufactured polymer modifiers due to decreasing the eventual highway cost. On the other hand, the usage of recycled plastics has become a worldwide requirement and awareness in order to decrease the pollution made by waste plastics. Hence, finding an area in which recycling plastics could be utilized has been targeted by many research teams so as to reduce polymer manufacturing and plastic pollution. To this end, in this paper, thermoplastic dynamic vulcanizate (TDV) obtained from recycled post-consumer polyethylene and ground tire rubber (GTR) were used to provide an efficient modifier for asphalt which decreases the production cost as well and finally might provide an ecological solution by decreasing polymer disposal problems. TDV was synthesized by the chemists in the research group by means of the abovementioned components that are considered as compatible physical characteristic of asphalt materials. TDV modified asphalt samples having different rate of proportions of 3, 4, 5, 6, 7 wt.% TDV modifier were prepared. Conventional tests, such as penetration, softening point and roll thin film oven (RTFO) tests were performed to obtain fundamental physical and aging properties of the base and modified binders. The high temperature performance grade (PG) of binders was determined by Superpave tests conducted on original and aged binders. The multiple stress creep and recovery (MSCR) test which is relatively up-to-date method for classifying asphalts taking account of their elasticity abilities was carried out to evaluate PG plus grades of binders. The results obtained from performance grading, and MSCR tests were also evaluated together so as to make a comparison between the methods both aiming to determine rheological parameters of asphalt. The test results revealed that TDV modification leads to a decrease in penetration, an increase in softening point, which proves an increasing stiffness of asphalt. DSR results indicate an improvement in PG for modified binders compared to base asphalt. On the other hand, MSCR results that are compatible with DSR results also indicate an enhancement on rheological properties of asphalt. However, according to the results, the improvement is not as distinct as observed in DSR results since elastic properties are fundamental in MSCR. At the end of the testing program, it can be concluded that TDV can be used as modifier which provides better rheological properties for asphalt and might diminish plastic waste pollution since the material is 100% recycled.

Keywords: Asphalt, ground tire rubber, recycled polymer, thermoplastic dynamic vulcanized.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1316861

References:

[1] J. Read. D. Whiteoak. The shell bitumen handbook. London: Thomas Telford. 2003.
[2] R. B. McGennis. R. M. Anderson. T. W. Kennedy. and M. Solaimanian: FHWA-SA- 95-003. AI. Lexington. KY. 1994.
[3] H. U. Bahia. W. P. Hislop. H. Zhai. and A. Rangel: NCHRP Report 459. TRB. Washington. D. C. (2001).
[4] X. Lu. and U. Isacsson. Modification of road bitumens with thermoplastic polymers. Polymer testing. 2000. 20(1). 77-86.
[5] M. Garcia-Morales. P. Partal. F. J. Navarro. and C. Gallegos. “Effect of waste polymer addition on the rheology of modified bitumen.” Fuel. vol. 85. pp. 936-943. 2006.
[6] J. Zhu. B. Birgisson. N. Kringos. “Polymer modification of bitumen: Advances and challenges.” European Polymer Journal. Vol.54. pp.18-38 2014.
[7] G. D. Airey. “Rheological properties of styrene butadiene styrene polymer modified road bitumens.” Fuel. vol.82. no.14. pp.1709-1719. 2003.
[8] G. D. Airey. “Rheological evaluation of ethylene vinyl acetate polymer modified bitumens.” Construction and Building Materials. vol.16. no. 8. pp.473-487. 2002.
[9] T. A. Khan. D. K. Sharma. and B. M. Sharma “Performance evaluation of waste plastic/polymer modified bituminous concrete mixes.” Journal of Scientific & Industrial Research. vol. 68. pp. 975-979. 2009
[10] E. Ahmadinia. M. Zargar. M. R. Karim. M. Abdelaziz. and P. Shafigh. “Using waste plastic bottles as additive for stone mastic asphalt.” Materials & Design. vol.32. no.10. pp.4844-4849. 2011.
[11] S. Rokade. “Use of waste plastic and waste rubber tyres in flexible highway pavements.” In International conference on future environment and energy. IPCBEE. Vol. 28. 2012.
[12] EN 12607-1: Bitumen and bituminous binders – Determination of the resistance to hardening under the influence of heat and air - Part 1: RTFOT method. European Standard. 2003.
[13] H. Bahia. and D. Anderson. "The New Proposed Rheological Properties of Asphalt Binders: Why are they Required and how do they Compare to Conventional Properties." STP18186S Physical Properties of Asphalt Cement Binders. ASTM International. 1995.
[14] J. P. Zaniewski. and M. E. Pumphrey. Evaluation of Performance Graded Asphalt Binder Equipment and Testing Protocol. West Virginia University. Morgan Town. pp. 109. 2004.
[15] T. L. J. Wasage. Stastna. J. & Zanzotto. L. “Rheological Analysis of Multi-Stress Creep Recovery (MSCR) Test.” International Journal of Pavement Engineering. vol.12. pp 561-568. 2011.
[16] ASTM D7405. Standard Test Method for Multiple Stress Creep and Recovery (MSCR) of Asphalt Binder Using a Dynamic Shear Rheometer. American Society for Testing and Materials. United States. 2010.