Biyokömür modifiyeli asfaltın kısa dönem yaşlanma direncinin incelenmesi

Abstract

Kompleks moleküler yapıya sahip olan asfaltın kimyasal bileşenleri, sıcaklık değişimleri ve atmosferik koşullar nedeniyle değişmektedir. Bu değişiklikler asfaltın yaşlanmasına neden olmaktadır. Asfaltın yaşlanması oksidasyon, buharlaşma ve sterik sertleşme olmak üzere üç şekilde meydana gelir. Asfaltın oksidasyonu önlenemez ancak azaltılabilir. Bu çalışmada, laboratuvar koşullarında dönel ince film etüvü testi yardımıyla kısa dönem yaşlanmaya maruz kalan asfaltın yaşlanma direnci üzerine biyokömürün etkisi araştırılmıştır. Çalışma kapsamında biyokömür, Rize ilindeki çay fabrikasından temin edilen çay bitkisi atığının pirolizinden elde edilmiştir. 50/70 asfalt yüksek hızlı karıştırıcı yardımıyla %0.5, 1, 2, ve 4 oranlarında biyokömür ile modifiye edilmiştir. Daha sonra yaşlandırma öncesinde ve sonrasında modifiyeli asfalt numuneleri üzerine kimyasal (taramalı elektron mikroskopu/enerji dağılımlı x-ışını spektroskopisi Fourier dönüşümlü kızılötesi spektroskopisi) ve fiziksel (yumuşama noktası, penetrasyon ve dönel viskozimetre) testler gerçekleştirilmiştir. Ayrıca, modifiyeli asfalt numunelerinin yaşlandırma öncesi ve sonrası fiziksel test sonuçları kullanılarak yaşlanma indeksi (penetrasyon yaşlanma oranı, yumuşama noktası artışı, viskozite yaşlanma indeksi) hesaplanmıştır. Elde edilen sonuçlar, biyokömürün asfaltın kısa dönem yaşlanma direncini geliştirdiğini göstermektedir. Bu çalışma, atık organik biyokütleden elde edilen biyokömürün asfaltın kısa dönem yaşlanma performansı üzerinde etkili olduğunu ispatlamıştır.

Keywords

• Biyokömür
• Kısa dönem yaşlanma
• Yaşlanma indeksi
• Piroliz yöntemi

Project Number

124C145

Investigation of Short-term Aging Resistance of Biochar Modified Asphalt

Abstract

Chemical composition of asphalt which has a complex molecular structure changes due to temperature changes and atmospheric conditions. These changes cause aging of asphalt. Aging of asphalt occurs in three ways: oxidation, volatilization, and steric hardening. Oxidation of asphalt is not prevented but can be reduced. This study examined influences of short-term aging on properties of biochar modified asphalt. Biochar was produced with pyrolysis of tea plant waste supplied from the tea factory in Rize province. Chemical (scanning electron microscopy/energy dispersive x-ray spectroscopy, Fourier transform infrared spectroscopy) and conventional asphalt tests were carried out on 50/70 asphalt penetration grade binder modified with biochar at the ratios of 0.5, 1, 2, and 4%. According to conventional asphalt tests, before short-term aging, as ratio of biochar added to 50/70 asphalt increases, the softening point and viscometer values of modified asphalt increase while the penetration value decreases. In addition, aging index (penetration aging ratio, softening point increment, viscosity aging index) was calculated using conventional asphalt test results of modified asphalt samples before and after aging. Biochar derived from pyrolysis of tea plant waste was increased aging resistance of asphalt by limiting its reaction with atmospheric oxygen. This study has proven that biochar obtained from waste organic biomass improves aging behavior of asphalt.

Keywords

• Biochar
• Short-term aging
• Aging index
• Pyrolysis method

Supporting Institution

The Scientific and Technological Research Council of Turkey

Project Number

124C145

Thanks

The authors would like to thank for financial supports by the Scientific and Technological Research Council of Turkey with the project number 124C145, 2218 National Postdoctoral Research Fellowship Program.

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