Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Aksut, Yavuz Selim(1)
- Aksüt, Yavuz Selim(1)
- Demirbilek, Mehmet(1)
- Demirtaş, Ö.F.(1)
- Gunes, Alper(1)
- Ilbeyli, Nurdane(1)
- Kaygusuz, Abdullah(1)
- Ozmen, Suleyman Fatih(1)
- Yalcin, Fusun(1)
- Yalcin, Mustafa Gurhan(1)
- Yetgin, Sukru(1)
- Yetgín, Sukru(1)
- Çelik, N.(1)
- Çevik, U.(1)
- Çullu, Mustafa(1)
- Özen, S.A.(1)
- Ünal Yaprak(1)
Yayınlar
- MakaleAçık Erişim2026Formulation of mechanical properties of hybrid fiber alkali-activated concretes by data analysis
Aksut, Yavuz Selim; Yetgín, Sukru
In this study, ground blast furnace slag (GBFS) and waste volcanic rock dust (RD) produced in a natural stone processing plant were used as binders. The binders were activated with Sodium Hydroxide (NaOH) and Sodium Silicate (Na2SiO3) to produce two types of concrete: alkali-activated concrete without fibers (AAC) and alkali-activated concrete with fibers (FAAC). In the production of concrete, steel and polyester fibers were used separately and hybrid at 0.25%, 0.50%, 0.75% and 1.0% by volume and a total of 117 15x15x15 cm cube specimens were produced. The mechanical properties of the specimens were evaluated by concrete surface hardness, ultrasonic pulse velocity and concrete compressive strength tests at 3, 7 and 28 days. The results obtained using non-destructive test methods were matched with concrete compressive strength values using various empirical formulas. Calculated concrete compressive strength values and actual concrete compressive strength values were compared using data analysis method. As a result, it was observed that there was a very significant correlation between the experimental compressive strength and the combined method in which 7-day surface hardness and ultrasound transmission rate were used together to calculate the compressive strength.
AtıfWoS1İncele - MakaleYalnız künye2025Scopus SJRQ1Modeling the Compressive Strength of Fiber-Reinforced Alkali-Activated Concrete Using Non-Destructive Methods in Short Curing Periods
Aksüt, Yavuz Selim; Çullu, Mustafa; Yetgin, Sukru
The indirect assessment of concrete compressive strength using non-destructive techniques, including the Schmidt rebound hammer and ultrasonic pulse velocity methods, is crucial for evaluating and tracking the strength of structural concrete used in construction and rehabilitation projects. However, studies focusing on alkali-activated concrete (AAC) remain insufficient. This study investigates the mechanical properties of fiber-reinforced alkali-activated concretes (FAACs) produced with short curing times, addressing this gap in the literature. Ground blast furnace slag (GBFS) was used as the binder, and waste volcanic rock dust (RD), produced in a natural stone processing plant, served as a fine filler. These materials were activated with sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) to produce alkali-activated concrete, both without fibers (AAC) and with fibers (FAAC). Steel fiber (SF) and polyester fiber (PYF) were used separately and in hybrid forms at 0.25%; 0.50%; 0.75%, and 1.0% volume fractions, resulting in a total of 117 cubic specimens (15x15x15 cm). The specimens' mechanical properties were evaluated using regression analyses based on data from Schmidt rebound number (RN), ultrasonic pulse velocity (UPV) non-destructive methods and uniaxial compressive strength (UCS) destructive tests. Optimized functions predicting compressive strength based on RN and UPV measurements were developed, highlighting the significant effects of fiber type, ratio, and mode of use. Additionally, multivariate prediction models were statistically developed using data from the three test methods.
AtıfWoS2OpenAlex1İncele - MakaleAçık Erişim2020Scopus SJRQ2Estimation of natural radionuclides’ concentration of the plutonic rocks in the Sakarya zone, Turkey using multivariate statistical methods
Yalcin, Fusun; Ilbeyli, Nurdane; Demirbilek, Mehmet; Yalcin, Mustafa Gurhan; Gunes, Alper; Kaygusuz, Abdullah; Ozmen, Suleyman Fatih
The study aimed to determine the natural radioactivity levels of226Ra,232Th, and40K by the Gamma-Ray spectrometry method, and radiological hazard parameters of the plutonic rocks in the Western and Central Sakarya Zone and to analyze the data using multivariate statistical methods. The average radiological values of samples were determined as40K (1295.3 Bq kg−1) >232Th (132.1 Bq kg−1) >226Ra (119.7 Bq kg−1). According to the skewness values of the distributions of the examined radionuclides,226Ra (2.1) and232Th (0.7) seemed to be positively right-skewed while40K (−0.2) had a negatively right-skewed histogram. On the other hand, the following kurtosis values were calculated for the distributions:226Ra (5.8 > 3),232Th (−0.7), and40K (−0.8). Kolmogorov–Smirnov and Shapiro–Wilk tests were applied to the data to test their normality. Therefore, Spearman’s correlation coefficient method was performed. The radionuclides of226Ra and232Th were found to have a positive correlation with radiological hazard parameters of the samples. 2 (two)-related factors identified, and the cumulative value was calculated to be 98.7% on the basis of the Scree Plot. According to the hierarchical cluster analysis, the samples that are grouped with those from Camlik region are prominent. The average radioactivity values of Camlik, Sogukpinar, Karacabey, and Sogut (except for232Th) regions were detected to be higher than the world averages while the value of40K was also found to be higher than the average values of various countries in the world.
AtıfScopus36WoS30OpenAlex37İncele - MakaleAçık Erişim2018Scopus SJRQ3The effect of energy resolution of detection instrument on mass attenuation coefficient
Çelik, N.; Özen, S.A.; Demirtaş, Ö.F.; Çevik, U.
The effect of energy resolution of two detection systems, HPGe and NaI(Tl), was determined by Monte Carlo (MC) calculation on mass attenuation coefficients of magnesium (Mg) and tungsten (W). In order to reveal the energy resolution effect, the detectors' collimator diameters were changed from 2 mm to 20 mm while sending collimated photon beams to the absorber material. It was observed that mass attenuation coefficients were increased with increasing collimator diameters. The performances of HPGe and NaI(Tl) detectors were quantified. The calculated results were compared with experimental results for Mg at energy of gamma rays 662 keV for different collimator diameters using both HPGe and NaI(Tl). It was observed that the MC calculation results were in a good agreement with the experimental data within the relative error from around 4% to 8%.
AtıfScopus8WoS7OpenAlex7İncele - Yüksek Lisans TeziAçık Erişim2015Afet lojistiğinde stok kontrolüne yönelik veri analizi
Ünal Yaprak
Afet kavramının çeşitli tanımları olmakla beraber en genel ve kabul göreni Birleşmiş Milletlerin de kabul ettiği tanımdır. Bu tanıma göre; "insanlar için fiziksel, ekonomik ve sosyal kayıplara neden olan, normal yaşamı durdurarak veya kesintiye uğratarak toplumları etkileyen ve yerel imkanlar ile baş edilemeyen her türlü doğal, teknolojik veya insan kaynaklı tüm olaylara" afet denilmektedir. Herhangi bir afet durumunda afetzedelere ve etkilenen kişilere organizeli ve planlı bir şekilde yardım sağlanması, planlı bir afet yönetimi ile mümkündür. Afet yönetiminde etkin bir hazırlık evresi sonucu yardımların zamanında ve yeterli bir şekilde ihtiyaç sahiplerine ulaştırılmasında ise planlı ve etkin bir lojistik devreye girmektedir. Afet lojistiği altı doğru çerçevesinde gerçekleşmektedir. Doğru miktarda yardımın doğru ihtiyaç sahiplerine, doğru yerde, doğru zamanda, doğru yöntemler kullanılarak, doğru yardımların ulaştırılması bu altı doğru ilkesini oluşturmaktadır. Doğru miktarda yardımın diğer ilkeler çerçevesinde ihtiyaç sahiplerine ulaştırılması ise planlı bir şekilde yapılacak stok kontrolünü gerektirmektedir. Yardım malzemelerinin en doğru ve verimli bir şekilde stok kontrolünün yapılması, en uygun yöntemin seçilmesi ve geçmiş yıllarda meydana gelen talep miktarları dikkate alınarak yapılan bilimsel analizler sonucunda mümkün olacaktır. Sonuç olarak, afet lojistiğinde en önemli konulardan birisi olan yardım malzemelerinin stok kontrolünün yapılmasıyla, meydana gelen afetlerden doğabilecek zararların azaltılması veya yok edilmesi mümkün olacaktır.
