Investigation of Products Obtained from Pyrolysis of High Density Polyethylene Waste Plastic as a Warm Mix Asphalt Additive

Öz

Warm mix asphalt (WMA) is a new technology that can be mixed and compacted at lower temperatures than hot mix asphalt (HMA). In this study, the effect of pyrolytic products (char and wax) obtain from the waste plastic (High Density Polyethylene-HDPE) on warm mix asphalt was investigated. Char and wax products were produced by slow pyrolysis method using 900 gr samples at the temperature ranges of 300-350ºC and 450-500ºC, respectively. These products were modified with virgin bitumen (at a rate of 6% by weight of bitumen) in the form of 3 modified bitumen: HDPE Pyrolysis Char (HDPEPC) modified bitumen, HDPE Pyrolysis Wax (HDPEPW) modified bitumen, HDPE Pyrolysis Char+Wax (HDPEPCW) modified bitumen. Penetration, softening point and viscosity tests were carried out to determine the physical properties of modified bitumen and virgin bitumen. Besides, Marshall Test Method was conducted to compare stability performance of the mixtures. The results show that, the addition of char decreased penetration value and increased softening point of virgin bitumen. The opposite results were obtained with the effect of the wax. According to the equivalent viscous method, the mixing and compaction temperature of the bituminous mixture can be reduced by 24ºC, 14,5ºC and 3,5ºC, respectively, when HDPEPW, HDPEPCW and HDPEPC are added to the bitumen. Marshall Test results show that the stability values of the WMA samples were slightly lower than the HMA sample and were also above the specification limits.

Anahtar Kelimeler

• Warm Mix Asphalt
• Slow Pyrolysis
• Plastic Waste
• High Density Polyethylene Pyrolsis Char
• High Density Polyethylene Pyrolsis Wax.

Yüksek Yoğunluklu Polietilen Atık Plastiğinin Pirolizinden Elde Edilen Ürünlerin Ilık Karışım Asfalt Katkısı Olarak İncelenmesi

Öz

Ilık karışım asfalt (IKA), geleneksel bitümlü sıcak karışımdan (BSK) daha düşük sıcaklıklarda serilip sıkıştırılabilen yeni bir karışım türüdür. Bu çalışmada, yüksek yoğunluklu polietilen (YYPE) türündeki atık plastiklerin pirolizinden elde edilen çar ve vaks ürünlerin IKA üzerindeki etkileri incelenmiştir. Çar ve vaks ürünler, sırasıyla 300-350ºC ve 450-500ºC sıcaklık aralıklarında, 900 gr numune kullanılarak yavaş piroliz yöntemi ile üretilmiştir. Piroliz ürünleri (bitüm ağırlığınca %6 oranında) saf bitümle (B50/70) modifiye edilerek 3 farklı formda katkılı bitüm hazırlanmıştır: YYPEPÇ (YYPE piroliz çar) modifiyeli bitüm, YYPEPV (YYPE piroliz vaks) modifiyeli bitüm ve YYPEPÇV (YYPE piroliz çar ve vaks) modifiyeli bitüm. Saf ve modifiye bitümlere penetrasyon, yumuşama noktası ve viskozite testleri yapılarak katkıların bitüm üzerindeki fiziksel değişimleri incelenmiştir. Ayrıca eşdeğer viskoz yöntemi ile modifiye bitümlerin karıştırma-sıkıştırma sıcaklıkları tespit edilmiştir. Bunun yanı sıra, hem saf bitümle hazırlanan BSK’ya hem de piroliz katkıları ile hazırlanan IKA’lara Marshall stabilite-akma analizi yapılmıştır. Bitümlü bağlayıcı test sonuçları gösteriyor ki, piroliz çarı saf bitümü sertleştirirken, vaks ürün yumuşatmaktadır. Dolayısıyla, çar ürünün etkisi ile bitümün pentrasyonu azalırken, yumuşama noktası artmaktadır. Vaks ürünün etkisiyle ise tersi sonuçlar elde edilmiştir. Saf bitüme kıyasla modifiye bitümlerin karıştırma-sıkıştırma sıcaklıklarındaki azalma değerleri YYPEPV, YYPEPÇV ve YYPEPÇ modifiyeli bitümler için sırasıyla 24ºC, 14,5 ºC ve 3,5ºC olmuştur. IKA’ların Marshall stabilite değeri, BSK’dan az bir farkla daha düşük olmasına rağmen şartname limit değerini rahatlıkla sağlamıştır.

Anahtar Kelimeler

• Ilık Karışım Asfalt
• Yavaş Piroliz
• Plastik Atığı
• Yüksek Yoğunluklu Polietilen Piroliz Çarı ve Yüksek Yoğunluklu Polietilen Piroliz Vaksı

Kaynakça

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