Experimental Investigation of Usability of 100% Recycled Asphalt Pavement (RAP) as a Cold Patching Material in Turkey

Year 2023, , 223 - 231, 15.03.2023

Orhan Kaya

https://doi.org/10.31466/kfbd.1230440

Cited By: 1

Abstract

In this study, the usability of 100% RAP as a cold patching material (CPM) was experimentally investigated. As part of this study, first, the RAP material has been characterized to determine its binder content and particle size distribution of the extracted aggregate. Then, three sets of RAP specimens (each set has three specimens) were prepared. These specimens were conditioned at 22°C, 40°C and 45°C for three hours. Then, the specimens were compacted with 75 Marshall hammer blows. The compacted specimens were then tested for their Marshall stability, and flow at 22°C. Air contents of the test specimens were also determined . It was observed that as conditioning temperatures of the compacted test specimens increased, their Marshall stability test results increased but their flow and air content test results mostly decreased. Marshall stability test results of all three sets of specimens were well above the specification limits. Moreover, all test specimens except for only one specimen conditioned at 22°C met the flow and air content criteria. It could be concluded that 100% RAP could be used as a CPM especially above 22°C. If it is needed to be used at around 22°C, it must be ensured that it is well compacted so that its air content is below 8% for a durable and comparably long-lasting cold patching application.

Keywords

RAP, Cold Patching Material, Asphalt Concrete, Marshall Stability

%100 Geri Dönüştürülmüş Asfalt Kaplamanın Türkiye'de Soğuk Karışım Bakım Malzemesi Olarak Kullanılabilirliğinin Deneysel Olarak İncelenmesi

Abstract

Bu çalışma kapsamında, %100 geri dönüştürülmüş asfalt kaplamanın (RAP) soğuk karışım bakım malzemesi (yama malzemesi) olarak kullanılabilirliği deneysel olarak araştırılmıştır. Bu çalışmanın bir parçası olarak, ilk olarak RAP malzemesi, bitüm içeriğini ve ekstrakte edilen agreganın gradasyonunu belirlemek için karakterize edildi. Daha sonra, üç set RAP numunesi (her sette üç numune vardır) hazırlandı. Bu numuneler 22°C, 40°C ve 45°C'de üç saat süreyle etüvde bekletildi ve bilahare 75 Marshall tokmak darbesi ile sıkıştırıldı. Sıkıştırılmış numuneler daha sonra bekletildi ve Marshall stabilite ve akma değerleri 22°C'de test edildi. Test numunelerinin hava muhtevaları da belirlendi. Sıkıştırılmış test numunelerinin sıkıştırılma sıcaklıkları arttıkça Marshall stabilite test sonuçlarının arttığı ancak çoğunlukla akma ve hava muhtevası test sonuçlarının düştüğü görülmüştür. Her üç numune setinin Marshall stabilite test sonuçları yönetmelik alt sınırının oldukça üzerindeydi. Ayrıca, 22°C'de şartlandırılmış bir numune dışındaki tüm test numuneleri, akma ve hava muhtevası kriterlerini karşılamıştır. Özellikle 22°C'nin üzerinde %100 RAP'ın soğuk karışım bakım malzemesi olarak kullanılabileceği sonucuna varılabilir. 22°C civarında kullanılması gerekiyorsa dayanıklı ve nispeten uzun ömürlü bir soğuk karışım bakım malzemesi uygulaması için hava muhtevasının %8'in altında olacak şekilde iyice sıkıştırıldığından emin olunmalıdır.

Keywords

RAP, Soğuk Karışım Bakım Malzemesi, Asfalt Betonu, Marshall Stabilite

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