Kazınmış asfalt kaplama (RAP) malzemelerinin filler oranının CBR performansına etkisi ve maliyet analizi

Yıl 2020, Cilt: 26 Sayı: 6, 1023 - 1029, 13.11.2020

Ayşegül Güneş Seferoğlu Mehmet Tevfik Seferoğlu Muhammet Vefa Akpınar Muhammet Çelik

Öz

Kazınmış asfalt kaplama (RAP) malzemeleri çevre kirliğini azaltması, enerji ve maliyet tasarrufu sağlaması nedeniyle doğal agregaya (DA) alternatif sayılabilecek bir malzemedir. Pek çok ülkede, yol üstyapı tabakalarında belirli oranlarda RAP malzemesi kullanımına müsaade edilmektedir. Fakat RAP malzemelerinin mekanik özellikleri malzemenin üstyapının hangi tabakasından elde edildiğine, kazındığı yolun hizmet ömrü ve yapım özelliklerine, yolda kullanılan malzemelerin (bitüm ve agrega) özelliklerine ve kazı makinesinin özelliklerine bağlıdır. Bu çalışmada, iki farklı karayolunun bozulmuş aşınma tabakalarından özel kazıma makinesiyle elde edilen RAP malzemeleri (RAP1 ve RAP2), DA ile farklı oranlarda (%0, %15, %30, %45, %60, %100) karıştırılmıştır. Elde edilen karışımlar üzerinde bitüm oranı, elek analizi, modifiye proktor ve Kaliforniya taşıma oranı (CBR) gibi laboratuar testleri yapılarak karışımların bazı karakteristik özellikleri, %100 DA karışım değerleri referans alınarak incelenmiştir. Sonuçlara göre DA malzemesine alternatif olarak plentmiks temel (PMT) tip-1 tabakasında kullanılabilir maksimum RAP1 ve RAP2 oranları ülkemiz Karayolu Teknik Şartnamesi (KTŞ) kriterleri doğrultusunda belirlenmiştir. Ayrıca RAP malzemelerinin kullanılması durumunda DA malzemesine olan ihtiyacın azalmasının sağlayacağı malzeme maliyetlerindeki kar oranları da kapsamlı bir maliyet analizi yapılarak belirlenmiştir.

Anahtar Kelimeler

RAP, DA, Temel tabakası, Maliyet analizi

Kaynakça

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