The modification of bitumen with reactive ethylene
terpolymer, styrene butadiene styrene and variable
amounts of ethylene vinyl acetate
S. Keyf
Received: 12 February 2013 / Accepted: 21 May 2013 / Published online: 6 June 2013
Ó Springer Science+Business Media Dordrecht 2013
Abstract In this article, 50/70 penetration graded TUPRAS bitumen was
modified. Reactive elastomeric terpolymer (Elvaloy RET) from DuPont, ethylene
vinyl acetate (EVA) and styrene butadiene styrene (SBS) polymers were used in
the bitumen modification. Set hours of the tests were applied to samples taken
from the obtained modified bitumen mixture, and 1 % reactive ethylene ter-
polymer, 1 % SBS and 0.5, 1, 1, 5, 2, and 2.5 % EVA (w/w) were added to the
raw bitumen. Penetration, penetration index, softening point, ductility and %
elastic recovery tests were performed with the modified bitumen and raw bitu-
men. The samples of raw bitumen and modified bitumen with 2 % RET, 1 %
SBS and 1 % EVA were investigated by means of IR spectroscopy (FT-IR) and
thermogravimetrical analysis/differential thermal analysis (TG/DTA). The raw
bitumen was modified with RET, SBS and EVA, and it was determined that the
penetration and ductility values were decreased while the penetration index,
softening point and % elastic recovery were increased. The most important
characteristics (such as softening point, penetration and % elastic recovery) of
the new polymer-modified bitumen (NPMB) containing 2.5 % EVA, 1 % RET
and 1 % SBS were compared with eight different types of polymer-modified
bitumens in Turkey (TPMB). NPMB provided all the required parameters
(softening point, penetration and % elastic recovery) for two different types of
TPMBs (TPMB 70-16, TPMB 70-22).
Keywords Polymer modification of bitumen Á Reactive ethylene terpolymer Á
Ethylene vinyl acetate Á Penetration Á Softening point
S. Keyf (&)
Department of Chemical Engineering, Yıldız Technical University, Istanbul, Turkey
e-mail: keyf@yildiz.edu.tr
123
Res Chem Intermed (2015) 41:1485–1497
DOI 10.1007/s11164-013-1287-9
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