Browsing by Author "Al-Noaimat, Yazeed Afet Adnan"
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Item PROPERTIES OF BURNT CLAY INCORPORATED CEMENTS(2022-02-16) Al-Noaimat, Yazeed Afet Adnan; Akış, TolgaThis study aims to compare the decomposition and pozzolanic reactivity of clays obtained from different regions of Turkey and from Guinea and to investigate their effects after calcination on the strength and water absorption properties of cement mortars when partially replacing Portland cement. Mineralogical and chemical compositions of the clay samples were determined using XRD (X-Ray Diffractometer) and XRF (X-Ray Fluorescence) tests, respectively. TG-DTA (Thermogravimetry - Differential Thermal Analyses) was used to determine the temperature profiles and the burning temperatures of the clays. Density and fineness of the burnt clays were also determined. In order to determine the optimum material properties, different burning temperatures and replacement levels (10, 20, and 30%) were considered. By applying compression tests, the strength activity index was calculated. Water absorption tests on 50 mm cube mortar specimens were also performed. It is found that for all temperatures, the selected burnt clays possess good pozzolanic activity. The highest compressive strength and lowest water absorption capacity were achieved when the clay determined as kaolinitic was burned at 700 °C and with 10% replacement level. While for the clay determined as montmorillonite, the optimum values were obtained at 700 °C with a 20% substitution level. Kaolinite was found to have higher pozzolanic activity and enhance the compressive strength and decrease water absorption more than montmorillonite. Moreover, it has compressive strength values even higher than cement.