2019 (4) 5

Extension of the pavement service life by bitumen modification with thermoplastic dynamic vulcanizates based on polymer wastes

O.P. Grigoryeva1, P. Akhmedzade2, S.H. Kasanagh2, O.M. Starostenko1, A.M. Fainleib1

¹Institute of macromolecular chemistry of the NAS of Ukraine

48, Kharkivs’ke shose, Kyiv, 02160, Ukraine

²Ege University, Bornova, Izmir, Turkey

Polym. J., 2019, 41, no. 4: 253-263.

Section: Structure and properties.

Language: Ukrainian.

Abstract:

The effect of a complex modifier with the structure of thermoplastic dynamic vulcanizate (TDV) obtained by dynamic vulcanization of reactivated ground tire rubber (RGTR) in a thermoplastic matrix of the recycled high density polyethylene (HDPER) and a copolymer of ethylene-propylene-diene monomer (EPDM) on the physical and mechanical characteristics of the polymer-bitumen binders based on a road bitumen is studied. By means of traditional methods and European standards, as well as using the modern international system of international standards “Superpave”, it is established that addition of this complex modifier to the bitumen provides, depending on the TDV content, strengthening of the complex of physical and mechanical parameters of the polymer-bitumen binders obtained. Thus, in contrast to the individual bitumen, in the samples of polymer-bitumen binders with increasing the TDV content from 3 to 7 wt.% an increase in the value of the softening temperature (Ts) by 3–13 °C, decreasing of 1,3–1,7 times of the penetration value (P25, at T = 25 °C) and a corresponding increase of 1,1–3,3 times of the penetration index (IP). Additionally, for the polymer-bitumen binders created significant increase of the complex shear modulus (G*) and the rutting parameter (G*/sin d), as well as high-temperature part of Performanñå Grades (PG) with increasing TDV content have been fixed. Thus for the polymer-bitumen binder sample with 7 wt.% TDV in comparison with unmodified bitumen the modulus G* was found to be higher by k » 8–13,4 times, the rutting parameter G*/sin d increased by 9,8–17,7 times, and finally a significant increase of high-temperature part of Performanñå Grades (PG) of bitumen binders from PG 64-Y for unmodified bitumen binder to PG 82-Y for the polymer-bitumen binder have been observed. Therefore, this sample of binder will work effectively at a pavement temperature up to T » 82 °C. The conclusion is made about the prospects of using the polymer-bitumen binders developed applying complex modifier of TDV structure in the pavements to extend their service life, increase resistance to shear loads, resistance to the formation of ruts, as well as resistance to high ambient temperatures.

Keywords: thermoplastic dynamic vulcanizates, recycled polyethylene and post-consumer tire rubber, road bitumen, polymer-bitumen binder, physical-mechanical properties.

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