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RISS 인기검색어
- 검색키워드
- 저자 : Yuksel Esen (검색결과 3 건)
- 무료
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Yuksel Esen,Eyyup Orhan 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.7
The objective of this study was to investigate the effect of superplasticizer and mineral admixture contents on the properties of Self-Consolidating Concrete (SCC). Silica fume was used as a mineral admixture and polycarboxylate based third generation superplasticizer was used as a chemical admixture. In order to determine the optimum admixture dosages; trial mixes were prepared with varying admixture dosages. Nine concrete mixtures with different admixture dosages were prepared from trial mixes. Hardened concrete properties and self-compactability criteria of these series were determined and test results were compared between these SCC mixtures. It was observed that 10S1.3A (10% Silica Fume, 1.3% Superplasticizer) and 10S1.5A (10% Silica Fume, 1.5% Superplasticizer) mixtures show the best performance with regard to fresh and hardened concrete properties.
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Effect of High Temperature in Concrete for Different Mineral Additives and Rates
Yuksel Esen,Alper Kurt 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.4
In this study, the change of the effect of high temperature in concrete by the types of mineral additives was examinedexperimentally. For this purpose, CEM I 42,5 R cement was used together with different minerals such as Barite, Diatomite, Silicafume, F class Fly ash that are added in a substituted manner at the rates of 10%, 20%, 30% and 40% by volume. Dry unit weights,underwater weights and water saturated weights of these concrete samples with mineral additives with 28-day strength werefound. Ultrasonic Pulse Velocity (UPV) measurements of the concrete samples, the water absorption percentages by weight ofwhich were determined, were performed. The samples which were then exposed to high temperatures such as 200, 400, 600 and800°C were left for cooling at room temperature, and then, their compressive strength was measured. While the highest waterabsorption rates were in Diatomite reinforced concrete, the highest compressive strengths were obtained in Silica fume reinforcedconcrete.
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Akan, Zafer,Baskurt, Busranur,Asliyuksek, Hizir,Kam, Erol,Yilmaz, Ahmet,Yuksel, Mehmet Bilgehan,Biyik, Recep,Esen, Ramazan,Koca, Dogan Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.1
This study examined the incidence rates of cancer cases (averages for 2006-2010) and relationships with environmental radioactivity levels. Soil and water samples were collected from provincial and district centers of Van city and the outdoor gamma doses were determined using a portable gamma scintillation detector. Gross alpha and beta, (226)Ra, (232)Th, and (40)K activities were measured in both tap water and soil samples. Although high rates of stomach and esophagus cancers have been reported previously in Van the underlying reasons have not hitherto been defined. Incidences of cancers were highest in the Gurpmar (326.0) and Ozalp (377.1) counties (p<0.001). As to the results of the gross alpha and gross beta radioactivity measurements in the drinking water, these two counties also had high beta radionuclide levels: Gurpmar ($140mBq/dm^3$) and Ozalp ($206mBq/dm^3$). Even if within the normal range, a relation between the higher rate of the incidence of stomach and esophagus cancers with that of the higher rate of beta radionuclide activity was clear. On Spearman correlation analysis, the relation between higher beta radionuclide levels and cancer incidence was found to be statistically significant (p<0.01). According to the results of the analysis, Van residents receive an average 1.86 mSv/y annual dose from outdoor gamma radiation, ingestion of radionuclides in the drinking water, and indoor $^{222}Rn$ activity. Moreover, gross alpha and beta activities were found to be extremely high in all of the lakes around the city of Van, Turkey. Further investigations with long-term detailed environmental radiation measurements are needed regarding the relationship between cancer cases and environmental radioactivity in the city of Van.
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