Calcination and characterization of clays obtained from cement plants of Türkiye

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2023-1

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Yeşilyurt, Oğul Can

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With the increasing concern regarding global warming, alternative methods to improve the sustainability of cement manufacturing gained attraction. Partial cement substitution with supplementary cementitious materials (SCM) carries a huge potential to improve sustainability or even performance when optimized properly. The commonity of the clay deposits provides a huge advantage to the clays as SCM, but due to vast differences in composition and behavior, proper characterization of the clays is required. In this study, 8 clays that are obtained from various cement factories in Türkiye are calcined at 600 °C and 800 °C and characterized with various physical, thermal, and mineralogical experiments. Compressive strength, flexural strength, and Strength Activity Index (SAI) of all raw and calcined clay incorporating blends are tested for early, standard, and late ages. The relationships between the clay compositions and post-calcination behavior, along with several other factors, are discussed. It is observed that the calcite presence in the clay composition played a crucial role in the strength development. With 600 °C calcination 3 clays, with 800 °C calcination 5 clays, all of which incorporate >10% calcite, were able to satisfy the 75% SAI threshold stated in ASTM C-618 Standard.

Subject Keywords

Characterization of clays, Calcined clay, Strength activity index, Clay composition

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https://hdl.handle.net/11511/102119

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

O. C. Yeşilyurt, “Calcination and characterization of clays obtained from cement plants of Türkiye,” M.S. - Master of Science, Middle East Technical University, 2023.