The aim of this paper is to examine the rheological behavior of bitumen modified by three waste plastics (old window frames, blinds, and cables) which are composed of polyvinyl chloride (PVC). Thus, nine polymer-modified bitumen samples were produced by adding the PVC-based modifiers to bitumen at three different contents (2%, 4%, and 6%).The rheological properties of the pure and modified bitumens were analyzed by means of conventional and rotational viscosity (RV) tests as well as the dynamic shear rheometer (DSR) test. The DSR test was performed at three different frequencies representing three different traffic speeds on highways. Master curves of complex viscosity and complex modulus of modified bitumens were plotted using the data obtained from DSR test results. After polymer modification, it was observed that all modified binders behaved like Newtonian fluid, especially at lower angular frequencies. The results of the tests indicate that waste blind modification has a certain stiffening effect on bitumen. However, it provides a higher complex modulus and a lower phase angle at all traffic speeds. Modification using waste blinds of more than 4% caused difficult workability of the bitumen. This means that, by using plastic blind waste as a modifier with a 4% usage rate, it is possible to decrease wheel-tracking deformation, which is fundamental for the extension of pavement life.

This paper describes polymer modification of bitumen with gamma-irradiated recycled (γ-LDPER) low-density polyethylene. The recycled low-density polyethylene (LDPER) was obtained from greenhouse films exposed to sunlight at least one year. The surface of theLDPERwas treated by gamma beam irradiation that provided formation of free radicals and some functional groups that may contribute to the creation of strong chemical bonds between polymer modifier and bitumen. Five different samples of bitumen/γ-LDPERcompositions with the modifier content, wt. %: 1, 3, 5, 7 and 9, were prepared. The effects of theγ-LDPERon original and aged bitumen were investigated by means of morphological, chemical, and physical testing program, including FTIR spectroscopy, conventional tests, rotational viscosity (RV), dynamic shear rheometer (DSR), and bending beam rheometer (BBR) tests. Superior performing asphalt pavements (Superpave) specifications were used to analyze mechanical test results as well as to determine the performance grades (PG) of the binders. Optimum usage of theγ-LDPERas modifier in bitumen were suggested after testing program. The results reveal the stiffening effect of theγ-LDPERon bitumen that provide enhanced temperature susceptibility and also promise better performance grades (PG) withγ-LDPERpolymer modification.

Bu çalışmada, polimer katkılı B50/70 sınıfına ait bitümlü bağlayıcının laboratuvar ortamında uzun süreli yaşlandırılması gerçekleştirilerek asfalt kaplamadaki yorulma ömrü tahmin edilmiştir. Bitümlü sıcak karışımların (BSK) orta sıcaklıklardaki yorulma performansını arttırma amacıyla Etilen Vinil Asetat (EVA) polimer katkısı bitüme yaygın olarak eklenmektedir. Asfalt bağlayıcıların modifiye işlemi tamamlanmasının ardından numuneler sırasıyla dönel ince film etüvü (RTFO) deneyiyle kısa süreli ve basınçlı yaşlandırma kabı (PAV) deneyiyle uzun süre yaşlandırmaya maruz bırakılmıştır. Yorulma performansının belirlenmesi Anton Paar Smart Pave Plus 301 DSR cihazıyla gerçekleştirilmiştir. Çalışmada, yorulma parametresi, Superpave yorulma deneyi ve lineer farklı genlik (LAS) deneyleriyle incelenmiş ve bu iki farklı deneyden elde edilen veriler karşılaştırılmıştır. Çalışma sonucunda, EVA katkısının saf asfalt bağlayıcının yorulma performansını ve yorulma ömrünü önemli ölçüde arttırdığı tespit edilmiştir.