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SETSCI - Volume (2018)
ISAS 2018 - Ist International Symposium on Innovative Approaches in Scientific Studies, Kemer-Antalya, Turkey, Apr 11, 2018

Use of Surface Activated Recycled Waste Polypropylene in Bitumen Modification (ISAS 2018_208)
Perviz Ahmetzade1*, Cahit Yerdelen2, Taylan Günay3, Alexander  Fainleib 4, Selim Altun5
1Civil Engineering Dept., Ege University  , İzmir, Turkey
2Civil Engineering Dept., Ege University  , İzmir, Turkey
3Department/Civil Engineering, Ege University , İzmir, Turkey
4National Academy of Sciences of Ukraine (NASU) , Kyiv , Ukraine 
5Civil Engineering Dept., Ege University, İzmir, Turkey
* Corresponding author: perviz.ahmedzade@ege.edu.tr
Published Date: 2018-06-23   |   Page (s): 235-236   |    44     6

ABSTRACT Bitumen polymer modification has a long history. However, most of the polymers currently used as additive in
bitumen are not economically attractive. Thus, employing recycled materials in flexible highway instead of virgin ones has
become a fundamental case for researchers especially in terms of cost efficiency and environmental awareness. To date, many
studies have been made to investigate using of recycled polymers in bitumen and generally improved physical properties of
bitumen were determined.

In this study, the recycled polypropylene (PP) was investigated for bitumen modification. Surfaces of recycled polypropylene
(PP) waste will be activated by chemical method that has never been processed before in Turkey. Free radicals, ions and
functional groups will be formed on the surfaces of surface-activated polypropylene and thus homogenous binders having
strong bonds were obtained by allowing them to have a chemical reaction with bitumen.  

The compatibility surface-activated PP admixtures with bitumen and the morphologic structure of the modified bitumen was
investigated with the help of FTIR spectroscopy. Conventional test methods such as, penetration, softening point and ductility
tests were also performed on base and PP modified bitumen samples. In order to determine effects of surface-activated waste
PP on aging properties of bitumen, rolling thin film oven test (RTFOT) was performed on to all binders. After determining the
fluidity characteristics of base and PP modified bitumen at high temperatures (135oC) with rotational viscosity (RV) test, the
rutting resistance (complex shear modulus, G* and phase angle, δ) of aged binders under certain temperature and loading
conditions were investigated by dynamic shear rheometer test (DSR).

The tests results reveal that a gradually increment in PP modification leads to a decrease in penetration and an increase in
softening point which is evidence of an increased stiffness of bitumen. An increment in rutting parameter after modification
observed by DSR test is a clear indication of better rheological properties of bitumen which means permanent deformation
occurred in flexible pavement can be restrained by surface-activated waste polypropylene modification.  
KEYWORDS bitumen, recycled polypropylene, surface activation, rutting
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