Kemal Muhammet ERTEN, Serdal TERZİ, Hüseyin AKBULUT

Köpüklü Bitümlü Karışımların Bitümlü Temel Tabakası Olarak Kullanılabilirliğinin Araştırılması

Köpük bitümle geri kazanılmış malzemeler ekonomik ve çevresel anlamda üstyapılar için umut verici malzemelerdir. Ancak bu malzemelerin üstyapıda nasıl konumlanacağı ile ilgili literatürde farklı görüşler mevcuttur. Performanslarının aşınma tabakası için uygun olmayacağı ancak bitüm ihtiva etmeleri nedeniyle PMT (plent mix temel) tabakası için kullanılmasının da bu malzemelerin değerlendirilmesinde özensiz davranılmış olacağı açıktır. Çalışmada geri kazanılmış bir üstyapı malzemesi ile hazırlanan 4 farklı köpük bitümlü karışım ile standart bir bitümlü temel karışımı tek eksenli dolaylı çekme modülü testinden elde edilen esneklik modülü değerleri açısından kıyaslanmıştır. Karışımlardan üç tanesi için gradasyon aynı olup iki tanesinde mineral esaslı bağlayıcı olarak çimento kullanılmış ancak bu iki üretimin birisinde 70/100 diğerinde 50/70 bitüm kullanılmıştır. 3. karışımda ise 70/100 bitüm ve sönmüş kireç+uçucu kül kullanılmıştır. Son karışımda 70/100 bitüm ve mineral esaslı bağlayıcı olarak çimento kullanılmış ancak gradasyon değiştirilmiştir. İlave olarak son üretim için kalıcı deformasyon kontrolü, üç eksenli tekrarlı basınç testi ile yapılmıştır. Tüm bu değişkenlerin sonuçları etkilediği ancak hepsi için elde edilen esneklik modülü değerlerinin bitümlü temel numunesinden elde edilene oldukça yakın olduğu sonucuna ulaşılmıştır. Uygulamada, köpük bitümlü karışımların bitümlü temel tabakasına göre daha kalın olacağı da düşünüldüğünde bu tabakanın bitümlü temel yerine kullanılması yapısal olarak uygun görünmektedir.

Anahtar Kelimeler:

Köpük bitüm, Üç eksenli döngüsel basınç, Dolaylı çekme esneklik modülü, Asfalt geri dönüşümü

Investigation of the Usability of Foamed Bituminous Mixtures as Bituminous Base Course

Materials recycled with foam bitumen are promising materials for pavements economically and environmentally. However, there are different opinions in the literature about how these materials are positioned in the pavement. It is clear that their performances will not be suitable for the wearing course, but that they are used for the plant mixture base course because they contain bitumen, and that these materials will be neglected in the evaluation of these materials. In the study, 4 different foam bituminous mixes prepared with a recycled pavement material and a standard bituminous base course mix were compared in terms of the resilient modulus obtained from the uniaxial indirect tensile resilient modulus test. Gradation is the same for three of the mixtures, two of them use cement as a mineral binder, but 70/100 grade bitumen in one of these two productions and 50/70 grade bitumen in the other. In the third mixture, 70/100 grade bitumen and hydrated lime (HL)+fly ash (FA) were used. In the final mixture, 70/100 grade bitumen and cement were used as mineral binders, but gradation was changed. In addition, permanent deformation control for the final production was carried out with a triaxial cyclic compression test. It was concluded that all these variables affect the results, but the resilience modulus values obtained for all were quite close to those obtained from the bituminous base sample. Considering that the foamed bituminous mixtures will be thicker than the bituminous base course in practice, it is considered structurally appropriate to use this layer instead of the bituminous base course.

Keywords:

Foamed bitumen, Indirect tensile resilient modulus, Triaxial cyclic compression, Asphalt recycling Köpük bitüm, Üç eksenli döngüsel basınç, Dolaylı çekme esneklik modülü, Asfalt geri dönüşümü,

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