Projects

Completed Projects

Mechanical Properties of Lightweight Concrete Made With Fiber Reinforced Fly Ash Pellets

BAP
Project Date: April 7, 2015
Mechanical Properties of Lightweight Concrete Made With Fiber Reinforced Fly Ash Pellets
Abstract:

 

The use of fly ash, which is a waste material of thermal power plants, in both production of artificial lightweight aggregate and concrete has some important environmental benefits of providing a remarkable reduction of the emission of green house gases by reducing the need for a large amount of cement, preserving natural and sometimes scarce materials of aggregates and avoiding the country side, river beds and beaches from damaging activities of aggregate mining as well as the structural advantages of high thermal isolation, advanced fire resistance and reduced dead load due to smaller column, beam and slab dimensions which is significant especially for high rise buildings. From this point of view, physical and mechanical properties of lightweight concrete containing lightweight fly ash aggregate produced by cold bonding or sintering process have been investigated. However, the effect of adding fibers into fly ash aggregates which was not investigated before and which can be considered as a possible solution to the disadvantage of being weak and more brittle for concretes with lightweight fly ash aggregates is compared to conventional concretes. Therefore, the effects of adding polypropylene and glass fibers and crumb rubber into cold bonded artificial lightweight fly ash aggregates during pelletization process will be first started to be investigated by our research team. Besides, mechanical properties of concretes that will be produced with fiber reinforced artificial lightweight fly ash aggregates and natural lightweight volcanic pumice aggregates will be compared. In the scope of this project, compressive strength, modulus of elasticity, flexural strength and fracture toughness, impact resistance and bond strength between steel rebar and concrete are planned to be investigated.

Project manager:
Prof. Dr. Turan Özturan
Project Team:
Hasan Yıldırım
Project start date:
April 7, 2015
Sürdürülebilir ve çevre dostu beton üretimi amacıyla geri dönüştürülmüş agregaların dayanım ve dayanıklılığının incelenmesi

BAP
Project Date: March 17, 2015
Sürdürülebilir ve çevre dostu beton üretimi amacıyla geri dönüştürülmüş agregaların dayanım ve dayanıklılığının incelenmesi
Abstract:

Usage of aggregates from construction demolition wastes is of utmost significance for the environmental pollution and protection of natural resources. Recycling of construction waste materials is not only beneficial to environmental issues but also to economy of concrete production. In several countries that encounter scarcity of natural resources, researches on this topic were encouraged to benefit from this kind of aggregates. In our country, after the new urbanization law in Istanbul, there has been a huge increase in the amount of construction demolition wastes. Researches on the use of these aggregates in structural concrete production are vastly needed. Major aim of this study is to use recycled concrete aggregates in new concrete for structural applications. In the first step of this study, concrete samples contaning recycled concrete aggregates (RCA) are going to be compared with conventional concrete. From these results, study will concentrate on defining and eliminating the causes of  the weaknesses of RCAs and 2 different techniques for surface treatments are proposed for this purpose. After the applications of these techniques, their contribution to mechanical properties will be investigated. From the different studies all over the world, several suggestions are given by several authors and in some countries use of recycled aggregate in structural application has also taken place in structural codes with some restrictions. But another important property of concrete is to withstand dynamic loads thus fatigue effect. There are limited studies in literature that concentrated on fatigue properties of concrete containing RCAs. Another major aim of this project is to study on the effects of dynamic loads on concrete containing RCA and evaluate any disadvantages with respect to conventional concrete.

Project manager:
Prof. Dr. Turan Özturan
Project Team:
Ahmet Onur Pehlivan
Project start date:
March 17, 2015
Effects Of Materials Used in Concrete And Post-Fire Re-Curing On Recovery Of Fire Damaged Concrete

BAP
Project Date: June 6, 2014
Effects Of Materials Used in Concrete And Post-Fire Re-Curing On Recovery Of Fire Damaged Concrete
Abstract:

In spite of the importance of strength regain of fire damaged concrete in terms of repair and rehabilitation, very few studies had been conducted. Most of the available data are in qualitative form and restricted to strength recovery only. In this study, rehydration and deterioration processes of concrete after high temperature exposure were investigated in details. Therefore, air and water re-curing methods were applied to air entrained fiber reinforced concrete incorporating different type of cementitious materials. Before and after re-curing processes, compression tests were conducted to determine mechanical properties and SEM, XRD and TG analyses were carried out to determine the morphological changes in concrete. Moreover, heated surfaces of concrete were monitored during air-recuring period and the relation between crack growth rate and compressive strength reduction were investigated. Deterioration in mechanical properties and changes in microstructure of concrete were observed after heating and these deterioration and changes continued during air re-curing period. On the other hand, recovery in mechanical properties and morphology of concrete were observed after water re-curing period. And finally, similar tests were conducted on reinforced concrete beams and prominent effects of air and water re-curing were also observed in these specimens.

Project manager:
Assoc. Prof. Dr. Nilüfer Özyurt Zihnioğlu
Project Team:
Abdullah Akca
Project start date:
June 6, 2014
Project end date:
December 16, 2017
Servo-Hydraulic Controlled Closed Loop Loading System for Civil Engineering Materials Testing

BAP
Project Date: July 18, 2013
Servo-Hydraulic Controlled Closed Loop Loading System for Civil Engineering Materials Testing
Abstract:

Bogazici University, Faculty of Engineering, Civil Engineering Department and labs were one of the first established units in the university in 1912 and they have been active in fields of both education and research from the day of establishment. Within the scope of this project, it is planned to buy a testing system which is servo-hydraulic controlled, enabling both static and dynamic loading and having high loading capacity (500kN). Along with the purchasing of this testing system, an important gap in our laboratory’s infrastructure will be filled and this improvement will be reflected in the results of the education and research studies in our laboratory. With the acceptance of this project, our 5 PhD candidates will be able to use this testing system for their thesis studies and experiments. In addition to that, this testing system will be used for the courses given in Civil Engineering Department and also for the industry projects. Therefore, a multi-way contribution will be obtained for education, research and industrial activities carried out in our department and laboratories.

Project manager:
Assoc.Prof. Dr. Nilüfer Özyurt Zihnioğlu
Project Team:
Project start date:
July 18, 2013
Project end date:
July 22, 2015
Designing Fire Resistant Cement Based Material

BAP
Project Date: August 8, 2011
Designing Fire Resistant Cement Based Material
Abstract:

In the scope of this study, it is planned to design a high strength concrete mix with an increased spalling and explosion resistance under the effect of high temperatures. Previous studies show that high strength concrete goes under greater damage when compared to normal strength concrete due to its very dense microstructure. Therefore, the codes and standards used for normal strength concrete is inadequate in defining terms and conditions required for high strength concrete under the effect of high temperatures. Of all the factors affecting fire resistance of concrete materials, concrete design, amount of water in concrete, component size, maximum temperature and rate of temperature increase could be listed as the most important ones. Previous studies show that the most important reason for spalling damage in concrete under high temperatures is the entrapped water vapour and the increased vapour pressure due to dense structure of concrete. The concrete mix which will be used in this study is specifically designed to leave pores/paths for water vapour in the dense microstructure. It is planned to examine the affects of water amount, component size, maximum temperature and the rate of increase in temperature by using the specimens which will be produced above mentioned mix design.

Project manager:
Assoc. Prof. Dr. Nilüfer Özyurt Zihnioğlu
Project Team:
Abdullah Huzeyfe Akca
Project start date:
August 8, 2011
Project end date:
November 7, 2012
TS EN 206 Standardında Donatı Korozyonu için Verilen Sınır Değerlerin Yalın ve Çelik Lifli Betonlarda Çatlak Oluşumu ve Yayılması Durumları da Gözönüne Alınarak Değerlendirilmesi

TÜBİTAK
Project Date: January 1, 2010
TS EN 206 Standardında Donatı Korozyonu için Verilen Sınır Değerlerin Yalın ve Çelik Lifli Betonlarda Çatlak Oluşumu ve Yayılması Durumları da Gözönüne Alınarak Değerlendirilmesi
Abstract:
Project manager:
Özturan,T.
Project Team:
Project start date:
January 1, 2010
Liflerin Donatı Korozyonuna Etkisi ve Lif Katkılı Betonarme Yapıların Korozyona Karşı Ömür Döngü Maliyet Analizi

TÜBİTAK/MAG
Project Date: January 1, 2008
Liflerin Donatı Korozyonuna Etkisi ve Lif Katkılı Betonarme Yapıların Korozyona Karşı Ömür Döngü Maliyet Analizi
Abstract:
Project manager:
Özturan,T.
Project Team:
Project start date:
January 1, 2008
Project end date:
January 1, 2009
Değişik Bağlayıcı Kompozisyonları ve Sıcaklık Uygulamaları ile Üretilen Hafif Uçucu Kül Agregalarının Özellikleri

BÜ Bilimsel Araştırma Projeleri
Project Date: January 1, 2007
Değişik Bağlayıcı Kompozisyonları ve Sıcaklık Uygulamaları ile Üretilen Hafif Uçucu Kül Agregalarının Özellikleri
Abstract:
Project manager:
Özturan,T.
Project Team:
Project start date:
January 1, 2007
Project end date:
January 1, 2008
Uçucu Kül Hafif Agrega Özelliklerinin Hafif Betonların Performansları Üzerine Etkileri

BÜ Bilimsel Araştırma Projeleri
Project Date: January 1, 2006
Uçucu Kül Hafif Agrega Özelliklerinin Hafif Betonların Performansları Üzerine Etkileri
Abstract:
Project manager:
Özturan,T.
Project Team:
Project start date:
January 1, 2006
Project end date:
January 1, 2008
Değişik Bağlayıcı Kompozisyonları ve Sıcaklık Uygulamaları ile Üretilen Hafif Uçucu Kül Agregalarının Özellikleri

BÜ Bilimsel Araştırma Projeleri
Project Date: January 1, 2006
Değişik Bağlayıcı Kompozisyonları ve Sıcaklık Uygulamaları ile Üretilen Hafif Uçucu Kül Agregalarının Özellikleri
Abstract:
Project manager:
Özturan,T.
Project Team:
Project start date:
January 1, 2006
Project end date:
January 1, 2008
Tekrarlı Basınç Yüklemeleri Sonrası Betonun Mekanik ve Geçirimlilik Özelliklerinin İncelenmesi

BOĞAZİÇİ ÜNİVERSİTESİ ARAŞTIRMA FONU
Project Date: January 1, 2004
Tekrarlı Basınç Yüklemeleri Sonrası Betonun Mekanik ve Geçirimlilik Özelliklerinin İncelenmesi
Abstract:
Project manager:
Özturan,T.
Project Team:
Project start date:
January 1, 2004
Project end date:
January 1, 2006
Prefabrik Yapılarda Sünek Kolon Kiriş Birleşimleri

TÜBİTAK/İÇTAG 589
Project Date: January 1, 2003
Prefabrik Yapılarda Sünek Kolon Kiriş Birleşimleri
Abstract:
Project manager:
Özturan,T.
Project Team:
Project start date:
January 1, 2003
Project end date:
January 1, 2005
Uçucu Kül Hafif Agregası Özelliklerinin Betonun Mekanik Davranışına Etkileri

BOĞAZİÇİ ÜNİVERSİTESİ ARAŞTIRMA FONU
Project Date: January 1, 2001
Uçucu Kül Hafif Agregası Özelliklerinin Betonun Mekanik Davranışına Etkileri
Abstract:
Project manager:
Özturan,T.
Project Team:
Project start date:
January 1, 2001
Project end date:
January 1, 2004
Yeni Tip Çimentolar ile Yapılan Betonların Klor Geçirgenliklerinin İncelenmesi

Türkiye Çimento Müstahsilleri Birliği
Project Date: January 1, 2000
Yeni Tip Çimentolar ile Yapılan Betonların Klor Geçirgenliklerinin İncelenmesi
Abstract:
Project manager:
Özturan,T.
Project Team:
Project start date:
January 1, 2000
Project end date:
January 1, 2002
Beton Ankrajlarının Statik ve Tekrarlı Yükler Altında Davranışlarının İncelenmesi

TÜBİTAK/İNTAG
Project Date: September 18, 2017
Beton Ankrajlarının Statik ve Tekrarlı Yükler Altında Davranışlarının İncelenmesi
Abstract:
Project manager:
Özturan,T.
Project Team:
Project start date:
January 1, 1996
Project end date:
January 1, 2000
Mineral Katkı ve Liflerle Güçlendirilmiş Yarı Taşıyıcı Perlit Betonunun Servis Ömrünün Araştırılması

B.Ü. Araştırma Fonu
Project Date: January 1, 1993
Mineral Katkı ve Liflerle Güçlendirilmiş Yarı Taşıyıcı Perlit Betonunun Servis Ömrünün Araştırılması
Abstract:
Project manager:
Özturan,T.
Project Team:
Project start date:
January 1, 1993
Project end date:
January 1, 1998
Polimer Bazlı Tamir Harçlarının Servis Şartları Altındaki Mekanik Davranışının ve Dayanıklılığının İncelenmesi

TÜBİTAK/İNTAG
Project Date: January 1, 1993
Polimer Bazlı Tamir Harçlarının Servis Şartları Altındaki Mekanik Davranışının ve Dayanıklılığının İncelenmesi
Abstract:
Project manager:
Özturan,T.
Project Team:
Project start date:
January 1, 1993
Project end date:
January 1, 1995