Browsing by Author "Topal, Ali"

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Determination of Optimum Bitumen Content in Porous Asphalt Pavement by Different Methods
(2022) İbiş, Ahmet Buğra; Şengöz, Burak; almusawi, Ali; Kaya Özdemir, Derya; Topal, Ali
In recent years, studies on porous asphalt have gained more importance and countries are conducting various studies in order to improve the engineering properties of this type of pavement. As a result of these studies, each country developed its own standard and therefore different optimum bitumen content (OBC) determination methods emerged. This paper investigates the determination of the optimum bitumen content of porous asphalt samples prepared by using different aggregate types and polymers by the methods implemented in Turkey and in other countries. The results have shown that the application of each method yielded different bitumen content.
Citation - WoS: 11
Citation - Scopus: 11
Economic and environmental impacts of utilizing lower production temperatures for different bitumen samples in a batch plant
(Elsevier, 2022) Almusawi, Ali; Sengoz, Burak; Ozdemir, Derya Kaya; Topal, Ali
The utilization of hot mix asphalt (HMA) for road construction necessitates high temperatures during mixing bitumen and aggregate at asphalt plant. The required (mixing) production temperature is calculated by the standard method (ASTM 2493). The application of this method for polymer modified bitumen (PMB) and warm mix asphalt (WMA) have tendency of higher temperatures. Therefore, some alternative methods suggested by literatures for the determination of production temperature for PMB and WMA have been implemented aiming to determine lower temperatures than the standard method (ASTM 2493). Moreover, the economic impacts of the determined production temperatures through different models are evaluated by the estimation of energy consumption in terms of electricity and natural gas costs for the batch type asphalt plants. Besides, the possible environmental effects are calculated by considering the carbon dioxide emissions. The results of this study have shown that the reduction in production temperatures led to a significant decrease in the total construction cost of each type of asphalt and a significant reduction in the estimated carbon dioxide emission. The results of this study can be used as a reference point for the estimation of both economic and environmental impacts of utilizing lower production temperatures for different bitumen samples.
Farklı Karıştırma ve Sıkıştırma Sıcaklıklarının Poroz Asfalt Kaplamaların Parça Kaybına Etkisi
(2025) İbiş, Ahmet Buğra; Sengoz, Burak; Almusawı, Alı; Ozdemir, Derya Kaya; Topal, Ali
Poroz asfalt, sıkıştırma sonrasında geleneksel asfalt kaplamalara göre daha yüksek hava boşlukları içeren, yağış sularının kaplama yüzeyinden alt katmanlara sızmasına izin veren, açık gradasyonlu agregaya sahip bir kaplama türüdür. Aşınma tabakasındaki parçacık kaybı, kaplama performansını etkileyen yüzey bozulmasına neden olur. Ayrıca poroz asfaltın gözenekli yapısı, kaplamayı sürekli olarak hava ve suyun etkisi altında bırakmakta, bu da oksidasyon hızını hızlandırmakta ve kaplamanın yüzey özelliklerini etkilemektedir. Ayrıca, bu faktörler bitüm-agrega bağ mukavemetini etkileyebilir ve asfalt film içinde kohezyonun bozulmasına neden olarak bitümün agregadan soyulmasına neden olabilir. Poroz asfaltın performansı, özellikle mukavemet ve dayanıklılık, sıkıştırma sıcaklığından büyük ölçüde etkilenir. Daha yüksek sıkıştırma sıcaklıkları karışımın hava boşluklarını azaltabilir, dolayısıyla gerekli karışım yoğunlukları elde edilemeyebilir. Bu çalışmada, modifiye edilmemiş bitüm ve SBS®, Elvaloy®, Sasobit® modifiyeli bitüm kullanılarak 3 farklı sıkıştırma sıcaklığında hazırlanan gözenekli asfalt numunelerinin parçacık kaybı araştırılmış ve optimum karıştırma ve sıkıştırma sıcaklığı belirlenmiştir.
Citation - WoS: 2
Citation - Scopus: 3
Mechanical Characteristics of Environmentally Friendly Permeable Pavement: Enhanced Porous Asphalt
(Jordan Univ Science & Technology, 2024) Ibis, Ahmet Bugra; Sengoz, Burak; Almusawi, Ali; Ozdemir, Derya Kaya; Topal, Ali
This study explores the mechanical properties of porous -asphalt pavement, focusing on the influence of various polymers (elastomeric and reactive elastomeric terpolymers) and different aggregate compositions. Two aggregates were utilized: one is exclusively limestone -based and the other is a blend of limestone and basalt aggregates. The research findings unveiled that mixtures containing the conventional bitumen failed to meet the Cantabro loss -test criterion required for porous asphalt, necessitating a maximum threshold of 20%. In contrast, asphalt mixtures modified with polymers exhibited notably superior performance, particularly in terms of permeability, Cantabro loss and the ratio of indirect tensile strength. These results underscore the significant impact of polymer modification on enhancing the crucial mechanical properties of porous asphalt. Therefore, the study suggests the adoption of polymer -modified asphalt as a viable strategy to improve pavement longevity and overall performance, promoting its use for sustainable and durable infrastructure.