Sürdürülebilir Kalkınma Amaçları
Yayınlar
- ArticleYalnız künye2026Data-driven resilience modeling: Shock response of Turkish logistics corridorss
Sünbül, Şeyma; Tortum, Ahmet
Traditional transport planning often fails to manage changes in people's mobility during crises. This study uses data from Meta's "Data for Good" platform to analyse how well Türkiye's transportation network can deal with external shocks. The mobility of 81 provinces was modelled using K-Means clustering and validated through spatial analyses and a Logistics Dominance Index (LDI). Results identify four distinct functional zones. Large metropolises (Cluster 4) showed high vulnerability, while logistics corridors (Cluster 2) demonstrated operational robustness, showing +3.69% continuity during crisis periods. LDI results indicate that road capacity in these regions is predominantly influenced by commercial freight. Despite the presence of high functional resilience, significant spatial risks are identified due to geographical overlap with the North Anatolian Fault Line. The findings of the present study suggest that future planning should prioritise network redundancy and data-driven dynamic management over static capacity expansion.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2025Strength and Microstructural Analysis of Nano Powder and Basalt Fibre Reinforced RCC Pavement Concrete
Tortum, Ahmet; Sünbül, Şeyma
Nowadays, durability and longevity represent the main issues in the field of road concrete. Roller Compacted Concrete (RCC) is a sustainable option for road pavements due to its low binder content, fast application and high strength. Nevertheless, there is a necessity for the improvement of RCC road concretes through the incorporation of various additives to enhance their performance. The present study investigates the mechanical and microstructural properties of RCC road concretes containing Fe₂O₃ and TiO₂ nano powders and basalt fiber additives. Three distinct mixtures were formulated, and a series of compressive strength, flexural strength and abrasion resistance tests were conducted. The results were verified by BET (Brunauer-Emmett-Teller) and SEM (Scanning Electron Microscope) analyses. The experimental findings demonstrated that the incorporation of nano powder and basalt fiber additives was effective in increasing the durability of concrete. The third mixture demonstrated optimal performance, exhibiting a compressive strength of 61.20 MPa, a flexural strength of 8.80 MPa, and a mass loss of 2.5 g. BET analysis revealed that the incorporation of nanopowders enhanced the matrix density by increasing the surface area. Furthermore, the SEM images demonstrated that the nanopowders were uniformly dispersed within the matrix, and the basalt fibres exhibited robust interfacial interactions. In conclusion, the combined use of Fe2O3 and TiO2 nanopowders with basalt fibre additive is considered as an effective approach to improve the performance of RCC road concretes.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2025An Application on Electric Vehicle Charging Station Site Selection With Multi-Criteria Decision-Making Methods
Sünbül, Seyma; Tortum, Ahmet
As the population grows and vehicles are increasingly owned, emissions from fossil fuels are worsening environmental problems. In this context, electric vehicles (EVs) present a significant alternative for the development of sustainable transportation systems. However, for electric vehicles (EVs) to become a prevalent form of transportation, the establishment of an effective and efficient charging infrastructure is imperative. The primary objective of this study is to ascertain the most suitable location for the installation of an electric vehicle (EV) charging station within the Erzincan Binali Y & imath;ld & imath;r & imath;m University Yaln & imath;zbag Campus. During site selection, the analytical hierarchy process (AHP) and TOPSIS methods were used to evaluate the criteria. The study was conducted in two stages. In the first, seven active-use transformers on campus were weighed using the AHP method, then the most suitable one was selected using the TOPSIS method.In the second, seven parking areas were analysed using the same criteria. The parking lot selection used the AHP and TOPSIS methods, considering faculty and campus entrance distance, lot capacity and transformer preference score. The findings of the study demonstrate the efficacy of the AHP and TOPSIS methods in the context of multi-criteria and multi-stage decision-making processes. The integration of these methods has been demonstrated to facilitate the optimisation of EV charging station location selection, both in technical and practical terms.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2024Investigation of The Use of Nano Powder On Roller Compressible Fibrous Concrete Roads
Sünbül, Şeyma; Tortum, Ahmet
Despite the fact that our country's road network is inferior to that of industrialized countries, the volume of motor traffic is increasing. Thus, optimal solutions are imperative during both project and construction phases of highway investments. Concrete superstructures offer an alternative to flexible superstructures in various regions globally, including airport runways, warehouses, urban roads, streets, highways and industrial buildings. The objective of this study was to enhance the compressive and flexural strength of concrete and provide resistance against abrasion. To achieve this, a roller compressible concrete (RCC) mixture design was developed by incorporating basalt fiber, nano TiO2, and nano Fe2O3 additives. The experimental results were subjected to statistical analysis via the technique of analysis of variance (ANOVA). The findings of the study indicated that the strength performance of the optimal RCC mixture design reinforced with nano powder and fibers was superior to that of conventional concrete. Upon examination on a material basis, it was determined that the compressive strength exhibited an increase when the water/binder ratio was utilised within the range of 0.38–0.4. As the utilisation of nano-Fe2O3 and basalt fiber materials increased, their compressive strength exhibited a corresponding enhancement. The incorporation of basalt fiber into the composite material resulted in an increase in flexural strength at all ratios where it was utilised. It can be concluded that basalt fiber has the greatest potential for enhancing flexural strength. The optimal water-to-binder ratio for flexural properties is between 0.34 and 0.38. While nano powders can have a positive impact, they cannot achieve the maximum level of strength. For improving abrasion resistance, it was established that reducing the water/cement ratio, using fly ash, basalt fiber, and nano Fe2O3 in the mixture decreased abrasion. However, the usage of nano TiO2 did not have a significant positive effect. The material with the least effect on compressive, flexural and abrasion resistance was identified as nano TiO2. When materials other than nano TiO2 are utilised in accordance with the established optimal mixture calculation, the durability of the resulting RCC road will reach the requisite standard.
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