Tez özetleri Astronomi ve Uzay Bilimleri Anabilim Dalı

Usability Of Aggregate Resources İn İstanbul Ayazağa-Cebeci-Çatalca Regions İn High Strength Concrete

This study was prepared as Master Thesis in Applied Geology Program, Department of Geological Engineering, Graduate School of Science, İstanbul University. Geological, petrographical, mineralogical of the sandstones and limestones in European part of İstanbul and also their usability as high strength concrete aggregate with the standard aggregate tests and concrete tests were correlated in details.

The study was carried out in Ayazağa, Cebeci and Çatalca regions. The quarries in Ayazağa region are located in Cendere Valley. In the region dark grey colored Devonian sandstones were investigated. These sandstones are angular-semi angular and fine-medium grained. In Cebeci region, Carboniferous sandstone and limestone were investigated. Sandstones are dark grey colored, angular-semi angular, medium-fine grained. Biomicritic limestones are dark grey and blue black colored with sparit veins. The quarries that are in Çatalca region are located in Sarıkayatepe. In the region there are fossiliferous micritic limestones.

Experimental studies were firstly begun with field observations and aggregate specimens were taken from Ayazağa, Cebeci and Çatalca Regions. From these samples, thin sections were prepared and they were examined under a polarising microscope. Besides, XRD analysis was made for determining mineralogical composition of the rocks.

In this study, for the evaluation the effect of different aggregates on concrete properties, standard aggregate tests were carried out in accordance with TS EN Standards. Accelerated mortar bar tests were also performed on sandstone and limestone aggregates for evaluation of the rocks from the point of alkali-aggregate reaction.

Two concrete mixtures are made by using same aggregate samples with two different cement dosages. Fresh and hardened concrete tests were carried out (compressive strength and tensile splitting strength) on the prepared concrete specimens. According to the experimental results conducted on concrete samples made with Çatalca limestone and Cebeci limestone aggregates, have highest strength.

Because of the petrographical characteristics and the aggregate properties of the sandstone and limestone aggregates produced in Ayazağa, Cebeci and Çatalca regions are in the acceptable limits or very close to these limits, therefore they are suitable to use in high strength concrete.

GÜNDÜZ Alper ,

Danışman : Y.Doç.Dr. İbrahim Halil ZARİF

Anabilim Dalı : Jeoloji Mühendisliği

Mezuniyet Yılı : 2006

Tez Savunma Jürisi : Y.Doç.Dr. İbrahim Halil ZARİF (Danışman)

: Prof.Dr. Okay GÜRPINAR

: Prof.Dr. Atiye TUĞRUL

: Y.Doç.Dr. Hasan EMRE

: Y.Doç.Dr.Ferhat ÖZÇEP

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