Yilmaz, Mehmet Birhan; Yalçın, Erkut; Furtana, Beyza; Kök, Baha Vural

Bitüm, asfalt çimentosunda çok az sayıda kullanılmasına rağmen, kaplamaların performansından önemli derecede sorumludurlar. Bu sebeple, bitüm, asfalt karışımların performanslarını geliştirmek için sıklıkla modifiye edilmektedir. SBS, bitümlü sıcak karışım’ların performans özelliklerini geliştirmek için asfalt bağlayıcılar için sıklıkla modifiye edici olarak bir polimerdir. SBS, sıcak hizmet sıcaklıkları altındaki gereklilikleri karşılamadığı zaman, neredeyse vazgeçilmez olmaktadır. Bu araştırmada, ethylene vinyl acetate (EVA) bazlı reçine (EBR) isimli alternatif katkı maddesinin SBS e olan performansı incelenmiştir. SBS içeriği %3’de sabit tutulmuştur ve baz bitümün ağırlığına göre, EBR içeriği %2, %3, %4 ve %5 oranlarındadır. Modifiye edilmiş bağlayıcılar 50/70 penetrasyon derecesi baz bitümü SBS ve EBR ile karıştırarak üretilmiştir. Penetrasyon, yumuşama noktası, dönel viskometre testi baz ve modifiye bağlayıcılara uygulanmış ve sonuçları karşılaştırılmıştır. Sonuç olarak, EBR içeriğinin, %3 SBS modifiyesi ile aynı performansı elde etmesi için %3’den daha fazla olması gerektiği belirlenmiştir. 3% EBR modifikasyonu, hassasiyet, yüksek sıcaklık direnci ve çalışabilirlik açısından tatmin edici bir performans vermiştir.

AtıfTR Dizin1

İncele

Yalçın, Erkut; Furtana, Beyza; Kök, Baha Vural; Yılmaz, Mehmet

The wear layer, which is used in the top layer of flexible pavements and is subjected to the most stress, is produced mostly with modified binders due to increased traffic volume and loads. Modification of the wear layer with polymer type additives has become inevitable. Recently bitumen used in bituminous mixture is modified with styrene-butadiene-styrene (SBS) polymer. There are quite successful applications in this regard. However, demand for SBS makes it difficult to provide always and brings on the use of alternative additives. In this study, the effect of ethylene-vinyl-acetate (EVA) based resin (EBR) on the rheological properties of bituminous binder was investigated and compared with SBS modification. As a result, it was found that 4% EBR modification in terms of rutting and cohesion properties showed similar performance with 3% SBS modification and in the case of the evaluation of low and high temperature properties together, 4.7% EBR modification had similar performance with 3% SBS modification.

İncele

Yalçın, Erkut; Furtana, Beyza; Kök, Baha Vural; Yılmaz, Mehmet

The bituminous coating layers used in the flexible pavement are the top layer that is directly exposed to the effects of the traffic and the environment and therefore must be quite robust in terms of mechanical properties. The bituminous binder used in the mixture, is commonly modified with the Styrene-Butadiene-Styrene (SBS) polymer additive so that the bituminous hot mixtures can resist to the increased traffic load and number for a long time without deforming. The high demand for SBS makes it difficult to supply when necessary and therefore brings on the use of alternative additives. In this study, the effects of the use of Ethylene-Vinyl-Acetate (EVA) based resin (EBR) on the mechanical properties of bituminous mixtures were investigated and their performance was compared with SBS modification. Marshall stability and flow, indirect tensile strength, indirect tensile stiffness modulus, indirect tensile cycling loading and dynamic creep tests were applied to pure and modified mixtures. As a result, it was found that EBR modification had significantly better performance compared to pure mixtures and showed close performance to SBS modification.

AtıfTR Dizin3

İncele

Yalçın, Erkut; Çeloğlu, M. Ertuğrul; Akpolat, Mustafa; Yamaç, Özge Erdoğan; Alataş, Taner; Kök, Baha Vural; Yılmaz, Mehmet

Styrene-butadiene-styrene (SBS) polymer is one of the most preferred additives to improve performance in hot mix asphalt pavements. The storage instability, in other words, the separation of a polymer-rich phase from the bitumen-rich phase in the course of storage and transportation is one of the prevalent problems in SBS modified bitumen. The present study attempted to obtain modified bitumen at the same performance level with the SBS modified bitumen, but stable with respect to the storage stability. For this purpose, both SBS and American Gilsonite (AG) were used in modified bitumen production. It was determined that modified bitumen at the same performance level was obtained with the use of 5 % SBS or 18 % AG in bitumen modification. It was also determined that the performance levels of the modified bitumen obtained with the use of 2 % SBS + 13 % AG, 3 % SBS + 10 % AG and 4 % SBS + 6 % AG were similar. Additionally, 2 %, 3 % and 4 % SBS modified bitumen were used for the assessment of storage stability properties of the SBS modified binders. These 8 different modified bitumen samples were tested for storage stability based on the EN 13399 standard. Penetration, softening point, rotational viscometer, bending beam rheometer, and dynamic shear rheometer tests were conducted on the samples. Based on all conducted tests, it was determined that more stable binders were obtained with the use of AG and SBS in terms of storage stability compared to solely SBS modified bitumen.

AtıfScopus18·WoS15·OpenAlex15

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