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    Effect of elevated temperatures on properties of high strength mortars containing ground calcined diatomite with limestone sand
    (Elsevier, 2022) Saridemir, Mustafa; Yildirim, Ahmet
    This paper investigates the effect of elevated temperatures on the properties of high strength mortars (HSMs) containing ground calcined diatomite (GCD) produced with limestone sand (LS). In the HSM mixtures at a water-binder ratio of 0.35, GCD is employed in place of cement at replacement ratios of 0, 5, 10, 15 and 20% by weight. The mechanical and microstructural properties of HSMs containing GCD produced with LS are investigated separately at different curing days and elevated temperatures. The results of these properties have indicated that GCD can be employed instead of cement in the HSMs containing GCD produced with LS, and GCD content up to %15 improve the mechanical properties of HSMs. Especially, deteriorations and cracks in the HSMs are seen due to the calcification and expansion of LS used as sand in the mixtures at 1000 degrees C temperature, and consequently, high decreases in the mechanical properties are observed.
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    Mechanical and microstructural properties of calcined diatomite powder modified high strength mortars at ambient and high temperatures
    (Elsevier, 2020) Saridemir, Mustafa; Celikten, Serhat; Yildirim, Ahmet
    In this experimental work, mechanical and microstructural properties of calcined diatomite powder (CDP) modified high strength mortars (HSMs) at ambient and high temperatures were researched. In the HSM mixtures, Portland cement was replaced with CDP at ratios of 0%, 5%, 10%, 15% and 20%. Several experiments regarding the hardened properties were carried out at 14, 28, 56 and 90 days at the ambient temperature of 25 degrees C. HSMs were heated up to high temperatures of 400 degrees C to 1000 degrees C at the age of 56 days, separately. Then, high temperature resistances of HSMs were quantified in terms of the residual hardened properties and the changes in the microstructural properties after heating. The residual performance was found to be higher in the HSMs modified with CDP than in the reference HSM (R-HSM) which was made 0% CDP. Based on the test results, it was seen that the HSM modified with 15% CDP (15CDP-HSM) exhibited the highest mechanical properties at ambient and high temperatures. (C) 2020 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.