Browsing by Author "Ekincioglu, Ozgur"

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Citation Count: 39
Approaches for sustainable cement production - A case study from Turkey
(Elsevier Science Sa, 2013) Ekincioglu, Ozgur; Gurgun, Asli Pelin; Engin, Yasin; Tarhan, Muhittin; Kumbaracibasi, Sezgi
One of the keys to achieve the sustainable construction goals in green projects is to select appropriate building materials for construction. Such projects aim to use eco-friendly materials that encourage the consumption of recycled and renewable materials, locally manufactured with less harmful gas emissions with long and durable profiles. Using these eco-friendly materials is also helpful for obtaining higher rates during the application processes of green building certificates. As the demand for sustainable materials increases globally, the construction material producers need to supply materials that can be used in environmentally responsible buildings without compromising ecological conditions. In particular, cement production has a huge impact on the environment because of releasing high amount of CO2 during production processes. This paper aims to express the sustainability of building materials in Turkish construction industry through analyzing cement production of a Turkish cement company where alternative fuels, raw materials, by-products and energy efficient methods are used for sustainable development. (C) 2013 Elsevier B.V. All rights reserved.
Citation Count: 5
CHARACTERIZATION OF ECOLOGICAL MACRO DEFECT FREE (MDF) CEMENTS BY INFRARED SPECTROMETRY
(Gh Asachi Technical Univ Iasi, 2011) Patachia, Silvia; Moise, Georgeta; Ozkul, Hulusi; Ekincioglu, Ozgur
The structural characterization is very important in evaluating the performance and the durability of Macro Defect Free (MDF) cements. These are cement-polymer composites characterized by high value of flexural strength. In spite of such remarkable mechanical properties, their use on large scale has been limited due to insufficient moisture resistance. In this study the structure alteration of MDF cements under humid conditions has been investigated, in order to better understand the complex phenomena that occur at inter-phase. FTIR spectroscopy in reflectance mode has been used. Analyses on the MDF surface and on MDF bulk, reflecting surface and mass composition, have been performed. New absorption bands and the shifting of the others have been noted and discussed. On the basis of the test results it is revealed that FTIR spectroscopy is a suitable technique that allows emphasizing the differences between the MDF cements structure in bulk and at surface.
Citation Count: 4
A discussion of paper "A novel indirect tensile test method to measure the biaxial tensile strength of concretes and other quasibrittle materials" by G. Zi, H. Oh, SK Park
(Pergamon-elsevier Science Ltd, 2010) Ekincioglu, Ozgur
[No Abstract Available]
Citation Count: 1
Effect of EVA Addition on the Properties of Portland Cement Mortars
(Istanbul Technical Univ Faculty Civil Engineering Printhouse, 2012) Ekincioglu, Ozgur; Ozkul, M. Hulusi; Patachia, Silvia
Due to the water sensitivity of polyvinyl alcohol (PVA), poly(ethylene-co-vinyl acetate) (EVA) is preferred in Portland cement mortar and concrete as modifier. The influence of EVA addition in Portland cement mortar is investigated by using mechanical strength tests as well as impermeability tests. Furthermore the pore size distribution by mercury intrusion porosimetry (MIP) and the interaction between cement paste and EVA by Fourier Transform Infrared Spectroscopy (FTIR) were searched.
Citation Count: 2
Effect of TiO₂ Addition on the Properties of Macro Defect Free Cement
(Istanbul Technical Univ Faculty Civil Engineering Printhouse, 2012) Ekincioglu, Ozgur; Ozkul, M. Hulusi; Patachia, Silvia; Moise, Georgeta
Macro-defect free (MDF) cement is a cement-polymer composite with superior flexural strength although produced by mixing cement with small amounts of polymer and water. Special production technique and the crosslinking occurred between cement and polymer are important factors for obtaining such high strengths. However, MDFs lose considerable strength when exposed to water. The objective of this study was to explore the effects of TiO2 addition on flexural strength and water sensitivity of MDF. In this study, MDF cements were produced by adding up to 4% TiO2 by weight of cement. Biaxial flexural test as well as Atomic Force Microscopy (AFM) and Fourier Transform Infrared Spectroscopy (FTIR) tests were conducted in order to investigate the effect of TiO2 addition. TiO2 addition improved the water resistance of MDF cements in some batches, especially with 2% addition possibly due to the C-PVA-O-Ti-O-C-PVA bond and this cross-linking mechanism together with C-PVA-O-Al-O-C-PVA bonds cause a more stable polymer network.
Citation Count: 39
Optimization of material characteristics of macro-defect free cement
(Elsevier Sci Ltd, 2012) Ekincioglu, Ozgur; Ozkul, M. Hulusi; Struble, Leslie J.; Patachia, Silvia
Macro-defect free (MDF) cement is a high-strength cement-polymer composite produced by mixing cement (commonly calcium aluminate cement) with small amounts of polymer (commonly polyvinyl alcohol acetate) and water, applying high shear, and finally applying relatively low pressure (about 5 MPa) and modest temperature (about 80-100 degrees C). However, MDF cements lose considerable strength when exposed to water. The objective of this study was to explore the effects of cement and polymer compositions on flexural strength and water sensitivity. Calcium aluminate cements were used with Al2O3 contents between 42% and 79%. Production of MDF cement was successful with all cements, but the highest strength (268 MPa) was obtained with 70% Al2O3 cement. Secondly, PVAs were used that differed in their degree of hydrolysis between 73% and 99%. Of these, the one with a moderate degree of hydrolysis produced the highest strength (228 MPa). All mixtures had strength loss on exposure to water, but PVAs with moderate degrees of hydrolysis exhibited the lowest strength losses (50-60%). (C) 2011 Elsevier Ltd. All rights reserved.