Coal fly ash (FA) is a by-product of combustion processes in coal fired power plants. Annually over 800 million tons of fly ash is being produced all around the world. Only a small portion of this ash is reutilized; a major portion goes to landfills or dumped at the sea. The disposal of FA causes significant economic and environmental concerns. Alkali-activation (AA) of fly ashes is a possible method to put some of the FAs in a beneficial use. Alkali-activated fly ashes (AAFA) might possess good mechanical properties, acid and fire resistance and thermal stability. This study aims to evaluate the alkali-activation and heat-exposure performances of FAs from various thermal power plants in Turkey through compressive strength, x-ray diffraction (XRD) and thermogravimetric measurements. The strength development of the AAFA samples were followed by 3-, 7- and 28-day compressive strength tests. The heat-exposure performance of the AAFA samples were determined by measuring the residual compressive strengths of the 28-day old samples after being exposed to elevated temperatures (400,700 and 1000°C). XRD and thermogravimetric measurements are used to follow the mineralogical changes in the activated samples during heat-exposure.

Performance of alkali-activated Turkish Fly Ashes at high temperatures

253rd National Meeting (2017)

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