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    Assessment of Scale Effects on Uniaxial Compressive Strength in Rock Salt
    (GEOLOGICAL SOC AMER, INC, 2009) Ozkan, I.; Ozarslan, A.; Genis, M.; Ozsen, H.
    In mining design studies, the determination of the in situ strength parameters of a rock mass is difficult, expensive, and time consuming. Therefore, designers prefer an empirical approach, which has been developed based on laboratory studies. However, the scale effect on uniaxial compressive strength (UCS) is an important parameter, particularly for special materials like coal and rock salt. The accurate determination of UCS under laboratory conditions makes it possible to reliably estimate in situ strength. In this study, the change in UCS attributable to scale was determined for Nevsehir-Gulsehir rock salt, and the results are presented to emphasize the importance of the scale effect on failure phenomena in rock salt under uniaxial compression. With statistical analysis, the critical height/diameter and height/width ratios were determined to be 1.5 for core specimens and 2.0 for prismatic specimens.
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    Combustion characteristics of 24 lignite samples
    (TAYLOR & FRANCIS INC, 2008) Sensogut, C.; Ozsen, H.; Demirbas, A.
    In this study, the combustion characteristics such as thermogravimetric analysis (TGA) and differential thermogravimetric analysis (DTGA), burning profile, ignition temperature, and peak temperature were analyzed for 24 lignite samples from different areas of Turkey. The samples were heated up to 900 degrees C at a constant rate of 10 degrees C/min in a 5 mL/min flow of dry air. The burning profiles of the samples studied, combined with proximate, sulfur analysis and calorimetry results, contribute to a clearer identification of lignite samples' structure and a better understanding of the coalification process. The lignite samples have been tested with particle size of 0-0.05 mm. Ignition temperatures of the samples have been determined from their burning profiles.