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    Bitumen expanding using bio-oil product of rose pulp's pyrolysis process
    (Elsevier Sci Ltd, 2020) Terzi, Serdal; Saltan, Mehmet; Armagan, Kemal; Kurtman, Akay Kurter; Karahancer, Sebnem; Eriskin, Ekinhan; Uz, Volkan Emre
    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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    Experimental investigation of the stabilization performance trends of two geogrids constructed on low bearing capacity subgrade
    (Korean Geosynthetics Society, 2018) Gökova, Süleyman; Saltan, Mehmet; Terzi, Serdal; Tutumluer, Erol; Uz, Volkan Emre; Karaşahin, Mustafa
    Experiments were carried out on real size samples in the laboratory to investigate the geogrid stabilization performance in highway pavement applications. A moving wheel load was applied on representative pavement samples constructed on low bearing capacity subgrade with and without geogrids. Two types of geogrids were used to construct the pavement sample configurations. Resistance to plastic (permanent) deformation was recorded as a performance indicator to compare structural performance trends of the pavement samples. For this objective, surface deformations were measured after certain wheel load repetitions. Rut depths were calculated from surface profiles measured with a laser profiler. Layer thicknesses were varied to observe differences in the deformation trends. When appropriate conditions were reached in the trial configurations, all layer thicknesses were kept constant during the tests. The two geogrid types constructed with the same granular materials and varying layer thicknesses were used in different layer interfaces to search for the most optimum solution. According to the study findings, the use of geogrid over soft subgrade with low CBR values has been shown to extend the life of the pavement by reducing the rut depth. Copyright © 11th Inter. Conf. on Geos. 2018, ICG 2018. All rights reserved.