Geri kazanılmış asfalt malzemenin uzun süreli filtrasyon performansı

Öz

Bu makalede, inşaat/yıkım (𝐶&𝐷) atığı türlerinden biri olan asfalt atık malzemesinin (𝑅𝐴𝑃) yol altı drenaj sistemlerinde filtre malzemesi olarak kullanılabilirliğinin tespiti için uzun süreli filtrasyon performansı incelenmiştir. Geri kazanılmış asfalt ve geotekstilden oluşan drenaj sisteminin zamana bağlı permeabilite davranışının belirlenmesi için yeniden tasarlanarak, geliştirilen ve imalatı yaptırılan 𝐴𝑆𝑇𝑀 𝐷 5101 deney düzeneğinde uzun süreli filtrasyon deneyleri (𝐿𝐹𝑇) yapılmıştır. Geliştirilmiş 𝐴𝑆𝑇𝑀 𝐷 5101 deneyi ile geri kazanılmış asfalt-geotekstil sisteminde oluşabilecek potansiyel tıkanma mekanizmaları, zaman ve akış yönüne bağlı olarak malzeme dane çapı dağılımındaki değişimler belirlenmiştir. Bu çalışmada, uzun süreli filtrasyon deneyleri ile özellikle yol altı drenaj sistemlerinin teşkilinde kullanılacak olan doğal filtre malzemeleri yerine geri kazanılmış asfalt malzemenin kullanılabileceğini göstermek amaçlanmaktadır. Geri kazanılmış asfalt malzemenin tekrardan kullanımı ile depolama sorununun ortadan kalkmasına, çevre kirliliğinin önlenmesine ve geoteknik mühendisliği açısından sürdürülebilir malzeme yönetimine (𝑆𝑀𝑀) katkıda bulunulmuş olunacaktır. Makalede agrega ve geotekstilden oluşan drenaj sisteminin uzun süreli filtrasyon davranışı, geliştirilmiş 𝐴𝑆𝑇𝑀 𝐷 5101 deney sisteminde incelenmiştir. Değişik hidrolik eğimler altında gerçekleştirilen uzun süreli filtrasyon deneylerinde agrega-geotekstil sisteminin tıkanma performansını tanımlayacak olan hidrolik eğim oranı (𝐺𝑅) ve geçirimlilik oranı (𝐾𝑅) değerleri belirlenmiştir. Çalışmada agrega olarak geri kazanılmış asfalt ve bu malzemenin filtrasyon performansının karşılaştırılması amacı ile doğal agrega (𝑁𝐴) kullanılmıştır. Geotekstil olarak tıkanma açısından en olumsuz durumu sağlayacak gözenek açıklığına sahip olan bir örgüsüz geotekstil tercih edilmiştir. Geliştirilmiş 𝐴𝑆𝑇𝑀 𝐷 5101 deney sistemi kullanılarak yapılan deneyler sonucunda, geri kazanılmış asfalt malzemenin performansının doğal agrega sonuçları ile yeterli seviyede karşılaştırılabilir olduğu anlaşılmıştır. Buna ek olarak, içeriğindeki bitüm malzeme oranı kontrol edildiği takdirde filtrasyon özellikleri bakımından yol altı drenaj sistemlerinde agrega olarak kullanılabilineceği düşünülmektedir. Böylece 𝑅𝐴𝑃’nın yeniden kullanımı ile sürdürülebilir malzeme yönetimine ve çevrenin korunmasına katkıda bulunulmuş olunacaktır.

Anahtar Kelimeler

• Geri kazanılmış asfalt malzeme
• Örgüsüz geotekstil
• Filtrasyon
• Geliştirilmiş ASTM D 5101 filtrasyon deneyi
• Sürdürülebilirlik

Long term filtration performance of recycled asphalt pavement material

Abstract

In this article, the long-term filtration performance of recycled asphalt pavement material (𝑅𝐴𝑃), one of the types of construction/demolition (𝐶&𝐷) waste, is investigated when used as a filter material in highway drainage systems. Long-term filtration tests (𝐿𝐹𝑇) were carried out in the 𝐴𝑆𝑇𝑀 𝐷 5101 experimental setup, which was redesigned and manufactured in order to determine the permeability behavior of the drainage system consisting of recycled asphalt and geotextile. With the usage of modified 𝐴𝑆𝑇𝑀 𝐷 5101 test setup, potential clogging mechanisms that may occur, and the change in grain size distribution of the material with respect to time and flow direction were determined. The long-term filtration test program aims to prove that recycled asphalt material could be used instead of natural filter materials particularly in the construction of highway drainage systems. The recovery of this material by reusing it will, eliminate the storage problem, prevent environmental pollution and make a contribution in terms of sustainable material management (𝑆𝑀𝑀) in geotechnical engineering applications. In the study, the long-term filtration behavior of the drainage system consisting of aggregate and geotextile was investigated in the modified 𝐴𝑆𝑇𝑀 𝐷 5101 test system. The gradient ratio (𝐺𝑅) and the permeability ratio (𝐾𝑅) were determined in the long-term filtration experiments performed under different hydraulic gradients, which define the clogging performance of the aggregate/geotextile system. Recycled asphalt aggregate and natural aggregate (𝑁𝐴) were used to evaluate the filtration performance of aggregates. A non-woven geotextile material with a pore opening to represent the worst conditions in terms of clogging was selected considering its hydraulic and physical properties. The results of the long term filtration tests indicate that the performance of the recycled asphalt material is comparable to the natural aggregate. Additionaly with controlled bitumen content, it can be used as an aggregate material in highway drainage systems in terms of filtration properties, thus contributing to sustainable material management. Therefore, with the re-use of 𝑅𝐴𝑃 as a filter material in highway drainage systems a contribution to the protection of environment could be achieved.

Keywords

• Recycled asphalt pavement material
• Non-Woven geotextile
• Filtration
• Modified ASTM D 5101 filtration test
• Sustainability

Kaynakça

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