Asfalt Kaplamalarda Bitüm Oranına Bağlı Olarak Sıkıştırma Sıcaklığının Etkisinin Marshall Deneyi Parametreleri ile İncelenmesi
Asfalt kaplamaların sıkıştırma sıcaklığının kontrol altına alınması kaplamadan beklenen performansın sağlanması açısından en önemli konulardan birisidir. Tasarım ve üretim aşamalarında ne kadar dikkat edilse de serme ve sıkıştırma aşamalarında karışım sıcaklığında bir miktar homojensizlikler ortaya çıkabilmektedir. Bu çalışmada aşınma tabakası tip 1A’ya göre dizayn edilmiş yoğun gradasyonlu asfalt kaplamalar için optimum bitüm içeriği %5,1 olarak hesaplanmış, bu değerinin altında ve üstünde (4,8; 4,9; 5,0; 5,0; 5,2; 5,3; 5,4) bitüm oranlarında hazırlanan asfalt karışımlar 143 °C ve 137 °C sıkıştırma sıcaklığında imal edilmiştir. Asfalt karışım örnekleri pratik yoğunluk, akma, stabilite ve Marshall oranı parametreleri ile değerlendirilmiştir. Çalışma sonucunda, 143 °C sıkıştırma sıcaklığında 137 °C’ye göre daha yüksek Marshall stabilite değerlerinin elde edilebildiği, optimum bitüm oranından daha yüksek artan değerlerde bitüm oranının artmasıyla akma değerlerinin artmakta olduğu ve 143 °C sıkıştırma sıcaklığında 137 °C değerine göre daha düşük akma değerleri oluştuğu gözlemlenmiştir. Stabilite değerlerindeki standart hatanın 143 °C sıcaklıkta daha düşük olduğu, sıkıştırma işlemi yapılırken, homojenlik anlamında, düşük sıcaklıklarda daha çok dikkat edilmesi gerektiği anlaşılmıştır.
Anahtar Kelimeler:
Asfalt karışım, Bitüm oranı, Sıkıştırma sıcaklığı, Marshall özellikleri, Karışım homojenliği
Investigation of The Effect of Compaction Temperature Depending on Bitumen Ratio on Asphalt Pavements with Marshall Test Parameters
Controlling the compaction temperature of asphalt pavements is one of the most important issues in terms of providing the expected performance from the pavement. No matter how much care is taken in the design and production stages, some inhomogeneities may occur in the mixing temperature during the laying and compaction stages. In this study, the optimum bitumen content was calculated as 5,1% for dense graded asphalt pavements designed according to wear layer type 1A, below and above this value (4,8; 4.9; 5,0; 5,0; 5,2; 5,3; 5,4) asphalt mixtures prepared at bitumen ratios of were produced at compaction temperatures of 143 °C and 137 °C. Asphalt mix samples were evaluated with practical density, flow, stability and Marshall quotient parameters. As a result of the study, it was found that higher Marshall stability values could be obtained at 143 °C compaction temperature than 137 °C, Marshall flow values increased with increasing bitumen ratio at higher values than optimum bitumen ratio, and lower flow values compared to 137 °C at 143 °C compaction temperature values have been observed. It has been understood that the standard error in the stability values is lower at 143 °C, and more attention should be paid at low temperatures in terms of homogeneity while compacting.
Keywords:
Asphalt mixtures, Bitumen content, Compaction temperature, Marshall properties, Mixture homogeneity,
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- ISSN: 2687-2315
- Yayın Aralığı: Yılda 2 Sayı
- Başlangıç: 2020
- Yayıncı: Ertuğrul Ağırbaş
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