Yazar "Ustabaş, İlker" için WoS İndeksli Yayınlar Koleksiyonu listeleme
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Comparing the pozzolanic activity properties of obsidian to those of fly ash and blast furnace slag
Ustabaş, İlker; Kaya, Ayberk (Elsevier Sci Ltd, 2018)The use of pozzolan in cement provides economic advantages and improves the physico-mechanical properties of cement. Fly ash and blast furnace slag are widely used in cement as pozzolanic materials. in this study, obsidian ... -
Determination of natural radioactivity levels of some concretes and mineral admixtures in Turkey
Baltaş, Hasan; Kiriş, Erkan; Ustabaş, İlker; Yılmaz, Esra; Şirin, Murat; Kuloğlu, Emrah; Güneş, Banu Erdoğan (Asian Journal of Chemistry, 2014)Nine concrete samples with or without mineral admixtures have been analyzed for their naturally occurring radionuclide of Ra-226, Th-232 and K-40 using HPGe gamma spectrometry. Also, concrete raw materials such as aggregate, ... -
Determination of the pozzolanic activities of trachyte and rhyolite and comparison of the test methods implemented
Baki, Vahiddin Alperen; Nayir, Safa; Erdoğdu, Şakir; Ustabaş, İlker (Springer International Publishing Ag, 2020)Natural pozzolanas should be evaluated in terms of sustainability as well as their contribution to concrete durability. Therefore, the use of such materials in the production of cement as well as concrete industry has been ... -
Effect of aluminosilicate precursors and curing regime on physico-mechanical durability and microstructural characteristics of coral geopolymers (Cor-Geo): Cleaner production for coral islands
Bayrak, Barış; Çelebi Oğuzhan; Öz, Ali; Ustabaş, İlker; Kaplan, Gökhan; Aydın, Abdulkadir Cüneyt (Elsevier, 2023)This study investigated the mechanical, durability, microstructure, carbon footprint and cost characteristics of new-generation metakaolin-based geopolymer composites. Instead of GBFS, 25 % metakaolin was used, and 25 ... -
Effect of wrapping thickness and type on reinforced bridge piers: A numerical study
Gürbüz, Ali; Ustabaş, İlker; Kurt, Zafer; Deşik, Fatih; Çakmak, Talip (Budapest University Technology Economics, 2024)This research paper investigates the impact of wrapping thickness and type on reinforced bridge piers through a numerical study. The Incesu bridge, located in the Ardanu & ccedil; district of Artvin province, was selected ... -
Fire retardation, compressive strength and durability analysis of concrete reinforced with novel plasters: An experimental, computational and statistical research
Ustabaş, İlker; Cüce, Pınar Mert; Alvur, Emre; Kesepara, Duygu; Yılmaz, Yusuf Nadir; Cüce, Erdem; Alshahrani, Saad (Elsevier, 2024)Concrete is an essential component of the construction industry, valued for its high compressive strength (CS) and durability. However, when exposed to extreme conditions like fire without protective structural elements, ... -
Geopolymer mortars having glassy materials considering mechanical and microstructural features
Çakmak, Talip; Ustabaş, İlker; Kurt, Zafer; Yılmaz, Erol (Elsevier, 2024)In comparison with ordinary Portland cements, geopolymer-based cements are now gaining prominence as an eco-friendly substitute to decline CO2 emissions in the course of OPC manufacturing. In this study, mechanical/microstructural ... -
The importance of early strength in structural applications: Obsidian-based geopolymer mortars and silica fume substitution study
Çakmak, Talip; Ustabaş, İlker; Kurt, Zafer; Gürbüz, Ali (Wiley, 2024)Geopolymer mortars, which cause less CO2 emissions than concrete and its raw material cement, are an innovative, environmentally friendly and sustainable building material. Geopolymers are formed by activating silica and ... -
Novel binder material in geopolymer mortar production: Obsidian stone powder
Kurt, Zafer; Ustabaş, İlker; Çakmak, Talip (Wiley, 2023)This paper presents the results of mechanical and micro-structural properties of geopolymer mortars with obsidian, ground granulated blast furnace slag, and metakaolin. In this study, 13 different combinations were created ... -
A novel framework for strength prediction of geopolymer mortar: Renovative precursor effect
Kurt, Zafer; Yılmaz, Yıldıran; Çakmak, Talip; Ustabaş, İlker (Elsevier, 2023)Concrete is the most used building material today as it has many advantages due to its structure. Geopolymer composites could potentially replace concrete in the future due to the demands of the construction industry. The ... -
Pozzolanic effect on the hydration heat of cements incorporating fly ash, obsidian, and slag additives
Ustabaş, İlker; Erdoğdu, Şakir; Ömür, İhsan; Yılmaz, Erol (Hindawi, 2021)Made up of an engineered mix of ordinary Portland cement (OPC) with artificial pozzolans such as trass, fly ash, and slag, the blended cements have been intensely employed within cementitious materials. The main reasons ... -
Pozzolanic properties of trachyte and rhyolite and their effects on alkali-silica reaction
Baki, Vahiddin Alperen; Nayir, Safa; Erdoğdu, Şakir; Ustabaş, İlker (Techno-Press, 2021)The alkali-silica reaction (ASR) is a highly complex chemical reaction which causes damage to concrete and thus adversely affects the durability and service life. Significant damage can occur in concrete structures due to ... -
Predicting mechanical properties in geopolymer mortars, including novel precursor combinations, through XGBoost method
Yılmaz, Yıldıran; Çakmak, Talip; Kurt, Zafer; Ustabaş, İlker (Springer, 2024)Concrete is the most widely used material in the building industry due to its affordability, durability, and strength. However, considering carbon emissions, it is believed that concrete will be replaced by geopolymers in ... -
Radiation shielding properties of mortars with minerals and ores additives
Baltaş, Hasan; Şirin, Murat; Çelik, Ahmet; Ustabaş, İlker; El-Khayatt, Ahmed Mahmoud (Elsevier Sci Ltd, 2019)Incorporation of mineral and ores as fine aggregate additives was investigated for its effect on the neutron and gamma-ray shielding properties of cement mortar. Five mortar mixtures have been prepared with different ... -
The seismic response evaluation of an existing multi-span reinforced concrete highway bridge in the presence of linear and nonlinear viscous dampers
Kıral, Adnan; Gürbüz, Ali; Ustabaş, İlker (Springer Nature, 2024)It’s crucial to keep bridges safe and operational all the time. Before or after an earthquake, they may require immediate seismic retrofitting. In this situation, adopting both isolation systems and viscous dampers could ... -
Thermal insulation and mechanical properties of a specially improved insulation plaster under freezing-thawing and high-temperature conditions
Ustabaş, İlker; Cüce, Erdem (Oxford University Press, 2023)In this study, the effects of heat preservation and the resistance to environmental conditions of ready-made insulating sludge used in the interior and exterior facades of the buildings were investigated. The insulation ... -
Transition coefficients between compressive strengths of samples with different shape and size in mass concrete and use of weight maturity method in dam construction
Ustabaş, İlker; Deşik, Fatih (Ernst & Sohn, 2019)Mass concrete (MC) is widely used in dam concretes due to their large aggregate grain diameters, low cement dosage, and low hydration temperatures. Monitoring of the hydration temperature and compressive strength is an ... -
Unlocking energy efficiency: Experimental investigation of bamboo fibre reinforced briquettes as sustainable solution with enhanced thermal resistance
Cüce, Pınar Mert; Alvur, Emre; Cüce, Erdem; Alshahrani, Saad; Prakash, Chander; Tan, Hüseyin; Ustabaş, İlker (Elsevier, 2024)Energy consumption data reveals that buildings account for 40 % of overall energy usage. Without urgent intervention, this figure is poised to escalate alongside population growth, exacerbating the dependence on fossil ...