Yazar "Saltan, Mehmet" seçeneğine göre listele

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    Bitumen expanding using bio-oil product of rose pulp's pyrolysis process
    (Elsevier Science, 2020) Terzi, Serdal; Saltan, Mehmet; Armağan, Kemal; Kurtman, Akay Kurter; Karahançer, Şebnem; Erişkin, Ekinhan
    Within the study, the usability of rose pulp, which is the common waste of many industrial products produced by using rose, was examined as bitumen modification material. In order to investigate this possibility and potential benefits, waste rose pulp was subjected to the pyrolysis process to obtain the biochar, bio-oil and biogas. Since it has a viscous liquid form, the bio-oil product has been selected to modify the bitumen for this study. Supplied wet rose pulp was first dried until the water content decreases to around 10%. Afterwards, the dried rose pulp subjected to pyrolysis process for one hour at 450 degrees C after 30 min heating period. Used neat bitumen's grade was PG 64-22. Bio-oil product has been mixed 2 and 4% by weight into the bitumen at 160 degrees C for 30 min. After the modification process, bitumen performance tests have been done. Because of the analysis, it was concluded that modification did not change the bitumen grade, reduced the mixing and compaction temperature up to 8 degrees C and so saving energy. In addition, the modification increases the optimum bitumen ratio up to 5%, strength value up to 4.1%, tensile strength ratio (TSR) value up to 2.3%, and the wheel tracking depth up to 95.2% but still remains within the Hamburg wheel tracking test specification limits. (C) 2020 Elsevier Ltd. All rights reserved.
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    The investigation of polyamide fiber as an additive in hma
    (Univ Zagreb, Fac Civıi Engineering, 2018) Erişkin, Ekinhan; Armağan, Kemal; Karahançer, Şebnem; Sivri, Çağlar; Saltan, Mehmet; Terzi, Serdal
    The number of heavy vehicles on traffic and traffic volume are extremely increasing nowadays. Consequently, maintenance costs are increasing too. So, durability becomes necessary in asphalt pavement design and construction. For this purpose, asphalt industry partners are investigating innovative technologies and additives for Hot Mix Asphalt (HMA) Pavements. In this study, the utility of Polyamide 6.6, which is a synthetically produced flexible and highly thermoplastic material that have good mechanical and physical properties in terms within the nylon species, was investigated in HMA as a fiber. For examining the test results, specimens were prepared in four different proportions including reference specimens. Volumetric mix design was used to determine the optimum bitumen content. Then Indirect Tensile Strength (ITS) Test was applied to HMA specimens. The aim of this research was to identify the usability of Polyamide 6.6 in HMA mixtures as a fiber, and the engineering properties of the specimens with Polyamide 6.6 fiber.
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    Usability of hemp fiber in dense graded hot mix asphalt mixture
    (Univ Zagreb, Fac Civıi Engineering, 2018) Karahançer, Şebnem; Erişkin, Ekinhan; Armağan, Kemal; Morova, Nihat; Saltan, Mehmet; Terzi, Serdal
    The usage of fibers as an additive to reinforce the paving material have a long history like decades in the World. In stone matrix, open graded or porous mixtures, these fibers were commonly used to increase the adhesion between aggregate and binder and this property was usable in asphalt mixture for preventing the drain down of binder. Also, fibers were used for improving crack resistance and increasing stability in dense graded asphalt mixtures too. As, the aphalt is generally acknowledged as a strong material for compression loads and weak for tension loads. In theory, fibers that have high tensile strength can reduce the stresses relatively to weak asphalt mixtures by transferring the stresses for increasing the tensile strength of the mixture. For investigating the efficiency of the fibers there have been many types and forms of fibers used either experimentally or routinely in asphalt mixtures. These investigations leaded researchers to the plant-based fibers like woody (such as jute, flax, straw, and hemp), leaves and seeds. For this aim the usability of hemp fiber examined in this study. For examining the test results, specimens were prepared in four different proportions including reference specimens. Volumetric mix design was used to determine the optimum bitumen content. Then Indirect Tensile (IDT) Strength Test was applied to HMA specimens.