Browsing by Author "Karadağ, Ömer"

Now showing 1 - 4 of 4

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Steel slag and its applications in cement and concrete technology: A review
(Elsevier, 2021-05-10) Gencel, O.; Karadağ, Ömer; Oren, O. H.; Bilir, T.; Architecture; KARADAĞ, Ömer
In this review, steel slag usage in the cement and concrete industry and its environmental effects were examined. Also, its physical and chemical structure, its effect on the characteristics of concrete, and its applications in different usage areas were specified. Within the scope of the study, literature was examined by reviewing investigations of steel slag usage in the cement and concrete industry. The content and results of these studies were assessed, and the intended effects of these by-products were presented. These factory by-products, whose storage and release into nature are quite inconvenient, are assessed at different sites around the world and regained to the sector. Thus the benefits of both economic and ecological balance were examined. As a result, opinions and recommendations were presented.
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Teaching earthquake-resistant structural systems in architecture department: a hands-on learning experience
(Taylor & Francis, 2023) Karadağ, Ömer; Çanakçıoğlu, Nevşet Gül; Architecture; KARADAĞ, Ömer; ÇANAKÇIOĞLU, Nevşet Gül
This paper addresses challenges in teaching earthquake-resistant structural systems to architecture students and seeks to enhance efficiency. Developing a compatible teaching approach is crucial for better collaboration with engineers. The impact of a lack of knowledge about earthquake-resistant systems is more evident in quake-prone regions. The study highlights the importance of hands-on experience in teaching structural theory, fostering better learning and comprehension. The study showcases an undergraduate-level course that diverged from traditional exams. Instead, students undertook a project where groups designed scaled models representing different structural responses, which underwent testing on a handmade shake table. Analysis highlighted demonstrations of various responses like soft stories, dynamic behaviour, pounding and weak columns. The hands-on approach enriched students’ practical insights into structural behaviour, aiding informed design choices. This approach enhances overall learning, deepens comprehension, and readies students to apply seismic design principles conscientiously. Learning by doing proves pivotal in mastering earthquake-resistant structural systems.
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Valorization of biomass ashes in the production of cementitious composites: A comprehensive review of properties and performance
(Elsevier, 2023-11-17) Danish, A.; Karadağ, Ömer; Bilir, T.; Ozbakkaloglu, T.; Architecture; KARADAĞ, Ömer
The demand for cementitious composites as the most abundantly used construction material is increasing due to rapid urbanization and industrialization, resulting in the exploitation of natural resources. Parallel to this, the ever-increasing world population is raising the demand for agricultural products leading to various challenges in disposing of consequential agricultural waste. One of the popular methods of managing agricultural waste is incineration, resulting in the production of biomass ash, which is eventually landfilled leading to environmental pollution. The scarcity of natural resources and increasing degradation of the environment are instigating scientific investigations to explore the potential of reducing the dependence on energy- and carbon-intensive materials (such as cement) by replacing them with waste materials. Therefore, this study evaluates the influence of biomass ashes (such as rice husk ash (RHA), bamboo leaf ash (BLA), sugarcane bagasse ash (SCBA), wood waste ash (WWA), and palm oil fuel ash (POFA)) derived from five abundantly available agricultural waste on the performance of cementitious composites. Based on the previously published literature, the biomass ashes were characterized by analyzing their mineralogical, physiochemical, mechanical, and durability properties. According to the analysis, it can be concluded that 5–10% cement can be replaced with RHA, BLA, WWA, and POFA without any significant effect on cementitious composites’ workability, whereas the incorporation percentage for SCBA can be 5–20%. Moreover, the optimal incorporation percentage of RHA, BLA, SCBA, WWA, and POFA in cementitious composites without any negative influence on the mechanical properties is 5–15%, 5–10%, 5–30%, 5–10%, and 5–20%, respectively. It is worth noting that these replacement ratios can be further increased by subjecting biomass ashes to different pretreatment methods, such as controlled combustion and grounding. The promising findings of this study may encourage additional experimental investigations on this topic to achieve sustainable development goals in agriculture and construction industries.
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Waste marble powder
(Elsevier, 2022) Bilir, T.; Karadağ, Ömer; Aygün, B. F.; Architecture; KARADAĞ, Ömer
Every manufacturing process generates waste. The amount of generated wastes increases as total production in every sector increases around the world. These wastes need to be managed somehow. Some byproducts and wastes can be utilized for using in construction sector and construction materials offer great potential about recycling wastes. For instance, 70% of marble block is wasted after quarrying and cutting and 40% of this waste becomes sludge. Recycling the generated wastes of marble industry in concrete production is an important aspect of both waste management and cleaner concrete production. The usability of waste marble dust in concrete and its effects on fresh concrete properties, hardened concrete properties and durability of concrete has been researched by various researchers. As a summary, it can be interpreted that waste marble dust usage with 5-20% replacement ratio in concrete can enhance the mechanical properties of concrete. Also, reuse of waste marble dust in concrete has environmental and economic benefits. Waste marble dust in concrete leads a reduction in cost and in carbon footprint of concrete. This chapter mainly focuses on the effects of waste marble dust in concrete on fresh concrete properties, hardened concrete properties, durability properties, environmental, and economic benefits.