An Investigation on Fatigue Life of Long Term Aged Ethylene-Vinyl Acetate (EVA) Polymer Modified Asphalt Binder

Abstract

The fatigue life of polymer modified B50/70 asphalt binder obtained from Turkey refinery was studied in this work. EVA modifier is used extensively to improve the fatigue performance of binder in the middle temperature range. After the EVA modification, the binders were exposed to short term and long term aging processes by means of rolling thin film oven (RTFO) and pressure aging vessel (PAV) tests, respectively. The fatigue performance of binders was evaluated by dynamic shear rheometer (DSR) Anton Paar Smart Pave Plus 301. The fatigue parameter was investigated by means of two different tests namely Superpave fatigue test and linear amplitude sweep (LAS) test, and the results obtained from these two tests were compared. The results showed that EVA modifier extends the fatigue performance and the fatigue life of binders.

Keywords

• Asphalt Binder
• Polymer
• Superpave Fatigue Parameter
• DSR
• Linear Amplitude Sweep (LAS)

Uzun Süreli Yaşlandırılmış Etilen Vinil Asetat (EVA) Polimer Katkılı Asfalt Bağlayıcının Yorulma Ömrünün İncelenmesi

Öz

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.

Anahtar Kelimeler

• Asfalt Bağlayıcı
• Polimer
• Superpave Yorulma Parametresi
• DSR
• Lineer Farklı Genlik (LAS)

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