Hibrit polimerlerle modifiye edilmiş bitümlü bağlayıcıların reolojik özelliklerinin incelenmesi

Uygulama bölgelerinde servis ömrü boyunca yeterli performans sağlayabilecek üstyapı kaplama tabakaları inşa edebilmek amacıyla uygun bağlayıcı seçimi büyük önem arz etmektedir. Trafik ve iklim koşullarından dolayı üstyapı kaplama tabakaları aşırı gerilmelere maruz kalmaktadır. Esnek üstyapı kaplama tabakalarının ana bileşenlerinden olan bitümlü bağlayıcıların özelliklerini iyileştirmek amacıyla çeşitli katkı malzemeleri modifkasyon amacıyla kullanılmaktadır. Modifikasyon yöntemiyle bitümlü bağlayıcıların mühendislik ve elde edilen asfalt karışımların mekanik özellikleri iyileştirilebilmektedir. Hibrit modifikasyon, geliştirilmiş bir modifikasyon elde etmek için iki farklı tipte asfalt katkı malzemesinin birlikte kullanılması yöntemidir. Bağlayıcı ve karışımların performanslarının iyileştirilmesi, maliyetlerin azaltılması ve atık malzemelerden faydalanılması hibrit modifikasyonun başlıca amaçlarındandır. Çalışma kapsamında, elastomerik (stiren-butadien-stiren (SBS), Kraton® D1101) ve plastomerik (Titan® 7686) katkı maddeleri ve bunların kombinasyonunun bitüm modifikasyonunda kullanılmasıyla bağlayıcıların reolojik özellikleri üzerindeki etkileri incelenmiştir. Deneysel çalışma sonucunda hem elastomerik hem de plastomerik katkı maddelerinin bitümlü bağlayıcıların yüksek sıcaklık performansını iyileştirdiği belirlenmiştir. Plastomerik katkı maddesi bağlayıcıların esnekliğini olumsuz etkilemiştir. Katkıların birlikte kullanımı değerlendirildiğinde %3,5 SBS +%1,0 Plastomerik katkı kullanılması durumunda Karayolları Genel Müdürlüğü şartname gereksinimlerinin karşılandığı, %4,5 SBS ile benzer performans seviyesinin sağlandığı tespit edilmiştir.

Anahtar Kelimeler:

Bitüm, Elastomer, Plastomer, Hibrit katkı, Reoloji

Analysis of rheological properties of modified bitumen with hybrid polymers

In the application areas, the selection of suitable binders is of great importance in order to build superstructure coating layers that can provide sufficient performance throughout the service life. Due to traffic and climate conditions, the superstructure coating layers are exposed to excessive stresses. Various additives are used for modification in order to improve the properties of bituminous binders, which are one of the main components of flexible superstructure coating layers. With the modification method, the engineering properties of the bituminous binders and the mechanical properties of the asphalt mixes obtained can be improved. Hybrid modification is a method of using two different types of asphalt additives together to achieve an improved modification. Improving the performance of binders and mixtures, reducing costs and utilizing waste materials are among the main objectives of hybrid modification. In the study, the effects of elastomeric (styrene-butadiene-styrene (SBS), Kraton® D1101) and plastomeric (Titan® 7686) additives and their combination on the rheological properties of the binders were investigated using bitumen modification. As a result of the experimental study, it has been determined that both elastomeric and plastomeric additives improve the high temperature performance of bituminous binders. The plastomeric additive adversely affected the flexibility of the binders. When using the additives together, it was determined that if 3.5% SBS + 1.0% Plastomeric additive is used, the General Directorate of Highways specification requirements were met and a similar performance level was achieved with 4.5% SBS.

Keywords:

Bitumen, Elastomer, Plastomer, Hybrid additive, Rheology,

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