Kül Sınıflandırma Tesisinde Farklı Akış Kolları İçin Çimento ve Beton Kalite Değerlendirmesinin Yapılması
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Tarih
2019Yazar
Zencirci, Ergin Sarp
Ambargo Süresi
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Increasing population and industrialization in the world and in our country bring intensive energy needs and therefore energy production is gradually increasing. In our country, thermal power plants have an important role in energy production. In Turkey mainly at low-power plants that use coal, large capacity are preferred. After the coal is turned into powder, it is burned in thermal power plants to produce the desired energy, while fly ash is produced as waste. Fly ashes cannot be released directly into the nature. For this reason, they are stored with the filter.However, this ash storage process has the ordinary effects on the environment. On the other hand, fly ash is preferred by concrete and cement industry due to its reactivity with water. 2% of the total energy consumed in the world is consumed in the cement manufacturing process. At the same time, 7% of the human-induced carbon dioxide emissions are realized by the cement sector.The cement sector with such large energy consumption and carbon emissions will be more environment friendly with the use of fly ash.
In this thesis, it is aimed to investigate the possibilities of use of Seyitömer fly ash in cement industry and to obtain comprehensive information about Seyitömer fly ash. In this study, ash samples taken from Seyitömer ash classification plant and CEM I 42.5 and CEM II / A-M (P-L) 42.5 R samples taken from Bursa Cement Plant were used. The study was carried out under 3 main headings.
In the first part, different fly ash samples were obtained by varying the parameters of air classifier in the ash classification plant, and 25% was added to cement and subjected to strength tests.10% strength at 7 days strength and 7.8% increase at 28 days strength has been achieved with the finenest ash value (D50: 19µm).
In the second part of the study; samples taken from the raw, waste and fine/product flow streams are ground to different fineness values with the aid of Bond mill. The fly ash obtained from different subtleties was added to the cement by 25%. In the evaluations, similar strengths were obtained from the different flow streams of the cement samples containing ash in the near strength values were obtained. In addition, samples were also subjected to concrete tests. When the waste and raw ash were ground, it had similar slump and spreading values as the reference ash.
In the last part of the study, it was investigated to prevent loss in early strength by using inter grinding and increase the ash addition. The strength values of the mixture samples where inter grinding was applied were higher than the mixtures where only the ash was ground. The ash additive can be increased up to 45% by inter grinding and the 28-day strength of the mixture is still higher than the reference sample by 4.6%. In addition, possible improvement evaluations were made with the fine grinding system in view of the quality data.