Kurum Yazarı "Ustabaş, İlker" İçin 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 ... -
The effect of capillarity on chloride transport and the prediction of the accumulation region of chloride in concretes with reinforcement corrosion
Ustabaş, İlker (Elsevier, 2012)In this study, 20-year-old residential buildings which have reinforcement bar corrosion in their basement columns were investigated in Rize, Turkey. The reason for the occurrence of high steel corrosion in only some certain ... -
The effect of occupational choice on job satisfaction and occupational accidents in the construction sector: A case study on Rize and Çorum in Turkey
Ustabaş, İlker; Sarı, Hatice; Fandaklı, Seda (Dynamic Academy Yazılım İnşaat San. Tic. Ltd. Şti., 2021)The construction sector is a sector that employs a significant amount of employees in Turkey and appeals to many branches of work and professions. In Turkey, the construction sector ranks first in the statistics ... -
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 ... -
Estimating the compressive strength of fly ash added concrete using artificial neural networks
Kurt, Zafer; Gürbüz, Ali; Çakmak, Talip; Ustabaş, İlker (Manisa Celal Bayar Üniversitesi Fen Bilimleri Enstitüsü, 2022)The aim of this study is to develop an artificial intelligence that predicts the compressive strength of fly ash substituted concretes using material mixing ratios. Within the scope of the study, 5 different fly ash mixed ... -
Experimental performance assessment of a novel insulation plaster as an energy-efficient retrofit solution for external walls: A key building material towards low/zero carbon buildings
Cüce, Erdem; Cüce, Pınar Mert; Alvur, Emre; Yılmaz, Yusuf Nadir; Saboor, Shaik; Ustabaş, İlker; Linul, Emanoil; Asif, Mohammad (Elsevier, 2023)Thermal insulation plasters have become the focus of attention in the building sector. Among the most important reasons for this is the high thermal energy losses of the buildings. Since conventional briquettes used in ... -
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, ... -
Gamma ray and neutron shielding properties of some concrete materials
Yılmaz, Erol; Baltaş, Hasan; Kırış, Erkan; Ustabaş, İlker; Çevik, Uğur; El-Khayatt, A.M. (Elsevier, 2011)Shielding of gamma-rays and neutrons by 12 concrete samples with and without mineral additives has been studied. The total mass attenuation and linear attenuation coefficients, half-value thicknesses, effective atomic ... -
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 ... -
Heavy aggregate and different admixtures effect on pavings: pyrite, corundum and water-retaining polymer
Ustabaş, İlker; Erdoğdu, Şakir; Akyüz, Cihan; Kurt, Zafer; Çakmak, Talip (Pontificia Universidad Catolica de Chile, Escuela de Construccion Civil, 2024)Concrete pavings are widely used in the construction industry as flooring for decorative and structural purposes in the gardens, parks, and roads of America, and Europe. In the present study, the effects of pyrite, corundum, ... -
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 ... -
Mechanical and microstructural properties of mortars: Obsidian powder effect
Çakmak, Talip; Gürbüz, Ali; Kurt, Zafer; Ustabaş, İlker (Yildiz Technical University, 2024)Concrete has been the world's most produced and utilized building material for years due to its economic and easy accessibility. However, it attracts attention due to the CO2 emitted from cement, the raw material of concrete, ... -
Mechanical and radiation attenuation properties of conventional and heavy concrete with diverse aggregate and water/cement ratios
Ustabaş, İlker; Demirci, Mustafa; Baltaş, Hasan; Demir, Yılmaz; Erdoğdu, Şakir; Kurt, Zafer; Çakmak, Talip (Croatian Association of Civil Engineers, 2022)This paper presents the results of comprehensive laboratory work conducted for investigating the mechanical and radiation attenuation characteristics of heavyweight concrete produced with pyrite, chromium, and magnetite ... -
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 ...