Evaluation of High Temperature Performance of Asphalt Binders Modified with Different Polymers Using MSCR Test

Öz

In this study, the effects of different additives on the stress-induced behaviour of asphalt binders were investigated using multiple stress creep recovery test (MSCR) experiments. Pure asphalt binder was modified with different proportions of SBS, 611 and 701 polymers. The experiment was carried out at 6 different temperatures and the creep recovery compliance (Jnr) and recovery percentage (R) were calculated for each cycle. Average Jnr and average R values were also calculated at different stress levels. The results showed that higher stress levels were associated with more pronounced nonlinear behaviour for all modified binders. In particular, the modified binders exhibited resilient behaviour against increasing temperatures at both low and high stress levels. Furthermore, the elastic return values increased with increasing additive in all three binders at different temperatures. The best additive for improving the elastic return properties of the pure binder was determined as 611.

Anahtar Kelimeler

• Polymer
• modification
• MSCR
• additive addition.

Farklı Polimerlerle Modifiye Edilmiş Asfalt Bağlayıcıların MSCR Testi Kullanarak Yüksek Sıcaklık Performanslarının Değerlendirilmesi

Öz

Bu çalışmada çoklu gerilme uygulaması sonrası sünme-elastik geri dönme (MSCR) deneyleri kullanılarak farklı katkı maddelerinin asfalt bağlayıcıların gerilme kaynaklı davranışı üzerindeki etkileri araştırılmıştır. Saf asfalt bağlayıcı farklı oranlarda SBS, 611 ve 701 polimerleri ile modifiye edilmiştir. Deney 6 farklı sıcaklıkta gerçekleştirilmiş ve her döngüde sünme geri dönme uyumu (Jnr) ve geri kazanım yüzdesi (R) hesaplanmıştır. Ortalama Jnr ve ortalama R değerleri de farklı gerilme seviyelerinde hesaplanmıştır. Bulgular, tüm modifiye bağlayıcılar için daha yüksek gerilme seviyelerinin daha belirgin doğrusal olmayan davranışla ilişkili olduğunu göstermiştir. Özellikle modifiye bağlayıcılar hem düşük hem de yüksek gerilme seviyelerinde artan sıcaklıklara karşı esnek özellik sergilemiştir. Ayrıca, elastic geri dönme değerleri farklı sıcaklıklarda her üç bağlayıcıda da katkı maddesinin artmasıyla artmıştır. Saf bağlayıcının elastic geri dönme özelliklerini geliştirme noktasında en iyi katkı maddesi 611 olarak belirlenmiştir.

Anahtar Kelimeler

• Polimer
• modifikasyon
• MSCR
• katkı ilavesi

Kaynakça

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