Sürdürülebilir Kalkınma Amaçları
Yazarlar
Yayınlar
- MakaleAçık Erişim2023Vulnerability-Preventing Structures in Disaster Management: Polyurea Coating on Building Structural Elements
Kaya, Afşin Ahmet; Akduman, Öznur; Aksüt, Yavuz Selim
Numerous disasters occur due to the inability to manage risks arising from natural, technological, and human-induced hazards. As a result of these disasters, the magnification of incurred damages underscores the significance of the concept of risk management, an integral step in disaster management. Consequently, efforts to mitigate the adverse effects of earthquakes and other disasters are progressively increasing. However, endeavors aimed at reducing the damages inflicted by earthquakes and other disasters on structures, particularly earthquakes, are not yet at an adequate level. Presently, the importance of alternative solution models to counteract the forces exerted on structures during disasters like earthquakes is on the rise.In this study, unreinforced concrete blocks were coated with flexible polyurea, a state-of-the-art cladding material extensively used in various fields, at different thicknesses. Three-point bending tests were performed on the coated specimens. The data obtained from these tests were analyzed and evaluated. It was concluded that specimens coated with polyurea exhibited higher strengths compared to uncoated specimens. This study introduces the utilization of polyurea flexible composite material in structural elements as an alternative method within the spectrum of precautions taken to enhance the safety of structures against various disasters, primarily earthquakes.
- MakaleAçık Erişim2019Investigation of Structural Properties and Wear Behavior of Surface Treated AZ31 Mg Alloy
Çelik, İlhan
Magnesium (Mg) and its alloys have a low density. For this reason, they are recognized as light metallic materials. Magnesium and its alloys have the potential capability to be widely used especially in the automotive, aviation and biomedical applications. However, their wear and corrosion resistance are very poor, so their area of usage is limited. This situation may adversely affect their usage without surface treatment despite their relatively well mechanical properties. Arc PVD technique was used to increase the wear resistance of AZ31 Mg alloy in this study. The surface coating process was applied to AZ31 Mg specimens as desired. Microstructural and morphological studies were done with XRD and SEM appliances. Pin-on-disc wear tests were performed to determine tribological properties. Through this study it was determined that AZ31 Mg alloy showed superior mechanical properties after applied CrN coating.
- MakaleAçık Erişim2019Determination of modulus of elasticity and bending strength of wood material impregnated with nanoparticle silicon dioxide (SiO2)
Yildirim, Mehmet Nuri; Yasar, Sekip Sadiye; Karaman, Abdurrahman
The purpose of this study is to determine the effects of the nano-particulate silicon dioxide (SiO2) material on the bending strength and modulus of elasticity in bending of some wood species. Oriental beech (Fagus orientalis L.) and sessile oak (Quercus petrea L.) woods species which are commonly used in the furniture industry were used in this study. Impregnation was carried out with the preparation of SiO2 at concentrations of 1% and 3% according to ASTM-D 1413-76 (1976) standards. According to the results, while solution concentration was increasing in both wood species, total retention (kg/m3) and percentage retention (%) values increased; air dry density (12%), bending strength and modulus of elasticity in bending decreased. The maximum mean values of bending strength and modulus of elasticity was in control samples of oriental beech and the minimum were in sessile oak wood with 3% concentration. These results can be related to the fact that the higher density of oriental beech wood (0.630-0.685 g/cm³). In both species of wood, impregnation with SiO2 resulted loss of about 3-5% in bending strength and 0.6-9% in modulus of elasticity.
- MakaleYalnız künye2013Laminat Parkede Bazı Yanmayı Geciktirici Kimyasalların Beyaz ve Esmer Çürüklük Mantarlarına Karşı Direncinin Araştırılması
Şen, Selim; Ozdemir, Ferhat; Tutus, Ahmet
Bu çalışmanın amacı laminat parke yapımında kullanılan yanmayı geciktirici kimyasal maddelerinin mantar çürüklük direnci üzerine etkisinin belirlenmesidir. Yanmayı geciktirici (FR: Fire retardant) olarak boraks (BX), borik asit (BA), amonyum polifosfat ve alfa-x (AX) kimyasal maddeleri kullanılmıştır. Kimyasallar %50 çam ve %50 kayın lifleri arasına tam kuru lif ağırlığına oranla %3,%6 ve %9 oranlarında toz olarak katılmıştır. Yüksek yoğunluklu (HDF: High density fiberboard) liflevhalar (400x400x6.5mm) üretilmiştir. Daha sonra levhaların yüzeyleri overlay, dekor ve balans kağıtları ile kaplanmıştır. Levhalar beyaz (Ceriporiopsis subvermisphora) ve esmer (Coniophora puteana) çürüklük mantarlarına maruz bırakılmıştır. Levhaların mantar çürüklük direnci araştırılmıştır. Sonuçta yanmayı geciktirici kimyasal maddelerin levhaların beyaz ve esmer çürüklük mantarlarına karşı direnci arttırdığı tespit edilmiştir. Ayrıca yanmayı geciktirici kimyasal madde türü ve konsantrasyon oranının laminat parkenin çürüklük direnci üzerine etkili olduğu da tespit edilmiştir.
- Proje2010Asfalt kaplamalarda sinerjik fayda kavramının anlaşılması, mekaniksel performans deneyleri ve bilgisayarlı tomografi görüntüleri yardımıyla deformasyon ve çatlama problemlerinin değerlendirilmesi
Iskender, Erol; Yildirim, Yetkin; Tayfur, Süreyya; Aksoy, Atakan; Ozen, Halit
-