The Effect of Different Mixing and Compaction Temperatures on the Particle (Cantabro) Loss in Porous Asphalt Pavements

Öz

Porous asphalt (PA) is a type of pavement with an open-graded aggregate that contains higher air voids than the conventional asphalt pavements after compaction, which allows precipitation waters to infiltrate from the pavement surface to the lower layers. The particle loss in the wear layer causes surface deterioration, which affects pavement performance. In addition, the porosity nature of porous asphalt leaves the pavement under the effect of air and water continuously, which accelerates the oxidation rate and affects the surface properties of the pavement. Moreover, these factors can affect the bitumen-aggregate bond strength and cause cohesion degradation within the asphalt film, causing the bitumen to peel from aggregate. The performance of porous asphalt, particularly strength and durability, is greatly affected by compaction temperature. Higher compaction temperatures can reduce the air voids of the mix, so the required mix densities may not be achieved. In this study, the particle loss of porous asphalt samples prepared at 3 different compaction temperatures by using unmodified bitumen, SBS®, Elvaloy®, and Sasobit® modified bitumen was investigated and the optimum mixing and compaction temperature was determined.

Anahtar Kelimeler

• Porous asphalt
• compaction temperature
• particle loss
• modified porous asphalt
• porous asphalt design
• polymers.

Farklı Karıştırma ve Sıkıştırma Sıcaklıklarının Poroz Asfalt Kaplamaların Parça Kaybına Etkisi

Öz

Poroz asfalt, sıkıştırma sonrasında geleneksel asfalt kaplamalara göre daha yüksek hava boşlukları içeren, yağış sularının kaplama yüzeyinden alt katmanlara sızmasına izin veren, açık gradasyonlu agregaya sahip bir kaplama türüdür. Aşınma tabakasındaki parçacık kaybı, kaplama performansını etkileyen yüzey bozulmasına neden olur. Ayrıca poroz asfaltın gözenekli yapısı, kaplamayı sürekli olarak hava ve suyun etkisi altında bırakmakta, bu da oksidasyon hızını hızlandırmakta ve kaplamanın yüzey özelliklerini etkilemektedir. Ayrıca, bu faktörler bitüm-agrega bağ mukavemetini etkileyebilir ve asfalt film içinde kohezyonun bozulmasına neden olarak bitümün agregadan soyulmasına neden olabilir. Poroz asfaltın performansı, özellikle mukavemet ve dayanıklılık, sıkıştırma sıcaklığından büyük ölçüde etkilenir. Daha yüksek sıkıştırma sıcaklıkları karışımın hava boşluklarını azaltabilir, dolayısıyla gerekli karışım yoğunlukları elde edilemeyebilir. Bu çalışmada, modifiye edilmemiş bitüm ve SBS®, Elvaloy®, Sasobit® modifiyeli bitüm kullanılarak 3 farklı sıkıştırma sıcaklığında hazırlanan gözenekli asfalt numunelerinin parçacık kaybı araştırılmış ve optimum karıştırma ve sıkıştırma sıcaklığı belirlenmiştir.

Anahtar Kelimeler

• Poroz asfalt
• sıkıştırma sıcaklığı
• parça kaybı
• modifiye poroz asfalt
• poroz asfalt dizayn
• polimerler.

Kaynakça

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