Characterization of fly ashes from thermal power plants in Turkey

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü, Türkiye

Tezin Onay Tarihi: 2015

Öğrenci: MELTEM TANGÜLER BAYRAMTAN

Danışman: ÇAĞLA AKGÜL

Özet:

Fly ash (FA) - a mainly amorphous, aluminosilicate fine powder- is the major by- product of coal-fired thermal power plants (TPP). FA is generated during the combustion of pulverized coal and collected in mechanical or electrostatic separators. FA is a widely used material in cement and concrete industry. According to the TPP technology, the characteristics of the burned coal and the operation conditions of the TPP; the characteristics of the FAs may vary considerably. The scope of this thesis is limited to chemical, physical, mineralogical (by XRD) and morphological (by SEM) analyses performed on 7 different FA samples collected from various TPPs. The FAs were classified according to TS EN 197-1 and the potentials of the FAs to be used in concrete industry was evaluated according to TS EN 450-1. In order to investigate the engineering performance of portland cement - fly ash binary systems, the strength development (up to 180 days) and heat of hydration (up to 7 days) were followed. Obtained results allow a better informed utilization of Turkish fly ashes in cement and concrete industry and provide a solid foundation for the characterization of other FAs produced in Turkey.