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Öğe Analysis of shrinkage and creep behaviors in polymer-coated lightweight concretes(Walter De Gruyter Gmbh, 2016) Bideci, Alper; Bideci, Ozlem Salli; Oymael, Sabit; Yildirim, HasanThe creep and shrinkage properties of polymer-coated lightweight concretes were examined. Five-hundred-dose lightweight concretes were produced by coating pumice aggregates with three different polymers (Sonomeric1: SNMC, KB Pur 214: KBP, and Polipol3455: PLP). The 3-, 7-, and 28-day compressive strength values of the obtained lightweight concrete samples were determined, and the 840-h and 12-month creep and shrinkage deformations were measured. It was found that the ductility of the SNMC- and KBP-coated concrete samples increased, while their shrinkage deformation results decreased when compared with the control samples. In contrast, the ductility of PLP concrete samples decreased and the shrinkage deformation became higher. In conclusion, the use of SNMC- and KBP-coated pumice aggregates had a positive effect on the creep and shrinkage properties of the concrete. Furthermore, it was observed that the compressive strength values of the lightweight concretes made of the coated samples were higher than those of the control sample.Öğe The Determination of Surface Hardness of Ready- Mixed Concrete Applications in Edirne by Use Of(Trakya Üniversitesi, 2009) Hammer, Schmidt; Oymael, Sabit; Sever, ÜnalWithin this study, the applications of ready-mixed concrete in Edirne are examined in terms of surface hardness and compressive strength. The measurements, done on the load-bearing elements of buildings with schmidt hammer, are then analysed in comparison with the values taken from concrete-mixing plants. When measurements done by using schmidt hammer in situ are compared with the press compressive strength values taken from concretemixing plants, it is seen that the compressive strength values found from the building elements are rather below the values of compression that are taken from the concrete-mixing plants. The inadequacies of concrete curing and compacting in the sites are accepted as the factors that lead to this result. On the other side, the strength losses, which result from the inadequacies of concrete curing, compacting and other technical issues, are determinedÖğe Examinations of the Internal Structure of Zeolite-Blended Cements(Trakya Üniversitesi, 2010) Oymael, SabitPozzolans are mineral-based materials that are not cementitious on their own, but gain cementitious properties when they are combined with lime and cement and react with water. Studies are in rapid progress to enhance performance in concrete made with pozzolanic cements. In this experimental study, cement paste specimens of 40x40x160 mm were cured in water and then kept in MgSO4 solution to examine their 7- and 28-day compressive strengths and XRD and SEM images. An examination of the chemical and physical changes in the specimens cured in water and MgSO4 solution revealed that the specimens blended with 15% zeolite and containing superplasticizers had a slightly higher compressive strength than the specimens cured in MgSO4 solution. This points out to the high pozzolanic activity and to the fact that 15% admixture rate made zeolite-blended specimens resistant against MgSO4 solution. Consequently, zeolite is converted into Calcium Silicate Hydrate (C-S-H) composites after binding the portlandite, Ca(OH)2, content in cement. Therefore, it could be argued that cements prevent corrosion, decrease the permeability of concrete, and improves its resistance against sulfate environments. The most characteristic aspect of the study is that the specimens were placed in MgSO4 solution on the 1st day. In this work, images which have different frame length are modeled by KLT (Karhunen Loeve Transform). PSNR is used as the performance criteria. It has been shown that, short frame length performs better than long frame length in image data compression.Öğe Internal structure examination of lightweight concrete produced with polymer-coated pumice aggregate(Elsevier Sci Ltd, 2013) Bideci, Alper; Gultekin, Ali Haydar; Yildirim, Hasan; Oymael, Sabit; Bideci, Ozlem SalliIn the construction sector, pumice is observed to be used in both structural and non-structural building elements. In this study, to produce a new kind of concrete, the aggregates are coated with three different polymers (Sonomeric1 : SNMC, KB Pur 214: KBP and Polipol3455: PLP) that have multiple uses. The mineralogical-petrographical features of both polymer-coated and uncoated aggregates were examined, and SEM (Scanning Electron Microscope) and XRD (X-ray Diffraction) analyses were performed. Moreover, in the study, lightweight concrete elements with different dosages (300, 400 and 500) were produced by using polymer-coated and uncoated aggregates; and their internal structure examinations were performed and compressive strength values of 3, 7 and 28 days samples were investigated. As a conclusion; among the aggregate samples, it was determined that PLP-coated aggregates have a more porous structure than the other polymer-coated aggregates and KBP-coated aggregates could be used in lightweight concrete (500 dosage) production. It was also concluded that the compressive strength values of lightweight concrete elements produced with coated samples increased even more. (C) 2013 Elsevier Ltd. All rights reserved.Öğe Polymer coated pumice aggregates and their properties(Elsevier Sci Ltd, 2014) Bideci, Ozlem Salli; Bideci, Alper; Gultekin, All Haydar; Oymael, Sabit; Yildirim, HasanPumices which are preferred due to their properties such as low unit weight, heat insulation property, resistance against fire were combined with polymer, the material of our age, to produce light concrete aggregate. In the study, pumice aggregate was coated by some polymers which are used for various purposes (Sonomeric1: SNMC, KBPur 214: KBP and Polipol3455: PLP) and the inner-structure examinations of the obtained aggregates was made by microscope and also specific weight, loose unit weight and water absorption experiments were applied. At the end of the study, the properties of pumice aggregates having high water absorption capability were developed and light aggregate production was realized. (C) 2014 Elsevier Ltd. All rights reserved.Öğe Türkiye’de Kamu Binalarının Deprem Riski ve Yapısal Hasar Durumlarının İncelenmesi: Edirne Örneği(Trakya Üniversitesi, 2015) Oymael, Sabit; Mıhlayanlar, Esma; Kartal, Semiha; Umaroğulları, Filiz; Bozacı, Mustafa; Puyan, SeçkinTürkiye yapı stoğunun büyük bir kısmının imar mevzuatına aykırı olması nedeniyle, başta deprem olmak üzere sürekli afet riski ile tehdit ve tehlike altındadır. Edirne, Çanakkale ve Saroz Körfezi gibi potansiyel deprem risk bölgelerine oldukça yakındır. Tarihi gelişim içinde Trakya Bölgesi’nde özellikle Edirne’de çeşitli büyüklükte depremler meydana gelmiştir. Bu nedenle Edirne deprem açısından dikkate alınacak merkez özelliğindedir. Bu çalışmanın amacı 2007 Deprem Yönetmeliği’ne (DBYBHY-2007) göre Edirne’de “önem katsayıları 1 olan kamu binalarından okulların ve hastanelerin” olası bir deprem öncesi yapısal (hasar) durumlarına, yapısal performanslarına ilişkin genel değerlendirmeleri yapmaktır. Bunun için Edirne il merkezinden örnek seçilen binalara teknik anketler uygulanmış ve gözlem yapılmıştır. Böylece olası bir depremde okul ve hastane gibi kamu binalarında meydana gelebilecek hasarların tespit edilmesi amaçlanmıştır. Araştırma sonuçlarında incelenen binaların %16’sında çatlakların olduğu, %50’sinin 30 yılı aşmış olduğu, %22’sinde sadece kış aylarında rutubet olduğu ve %7’sinde de bodrum katlarında sürekli rutubet olduğu tespit edilmiştir.Anahtar kelimeler: Deprem riski, Yapısal hasar, Yapısal performans
