Yazar "Durgun, Muhammed Yasin" seçeneğine göre listele

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    Effect of Colemanite Ore Wastes Utilization on Fresh Properties and Compressive Strength of Cementitious Systems
    (Springer Heidelberg, 2022) Ozen, Suleyman; Durgun, Muhammed Yasin; Kobya, Veysel; Karakuzu, Kemal; Mardani-Aghabaglou, Ali
    In this study, the usability of colemanite wastes (CW), in mortar mixtures, was examined in terms of compressive strength, while at the same time it was aimed to evaluate the effects of this waste on the rheological properties of mortar and paste mixtures. Mortar and cement paste mixtures were produced by substituting 1, 3, 5, and 7% of the cement with the CW. Marsh-funnel flow times, mini-slump values, rheological parameters, and setting times of cement paste mixtures containing CW were determined. The time-dependent slump-flow and 1-, 7-, 28-, and 56-day compressive strength values of the mortar mixtures were determined. The microstructures of the specimens were evaluated by using SEM images, and phase analyses were examined with XRD analysis. The results showed that the use of CW negatively affected the fresh state properties and rheological parameters of cementitious systems. However, CW addition decreased the 1-, 7-, and 28-day compressive strength. Only a slight increase was observed in the strength of mixtures containing 5 and 7% CW at 56 days.
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    Effect of high temperature on polypropylene fiber-reinforced mortars containing colemanite wastes
    (Elsevier, 2021) Durgun, Muhammed Yasin; Özen, Süleyman; Karakuzu, Kemal; Kobya, Veysel; Bayqra, Sultan Husein; Mardani-Aghabaglou, Ali
    In this study, the effect of polypropylene (PP) fiber utilization ratio on the fresh and some hardened properties of mortar mixtures containing colemanite waste (CW), which mainly contains B2O3, SiO2 and CaO, containing mortar mixtures were investigated. The 17 mortar mixtures were prepared by replacing 0, 1, 3, 5, and 7 wt% of cement with CW and by adding 0, 0.5, 0.75, and 1% by volume of PP fibers to the control mixture. In all mixtures, water/binder ratio, sand/binder ratio and slump-flow values were kept constant as 0.485, 2.75 and 220 +/- 20 mm, respectively. Water reducing admixture requirement of each mixture was determined to provide the target slump-flow range in mortar mixtures. There was a change in the amount of admixture according to the amount of CW and fiber content in the mixture. The 28 and 56-day water absorption capacity, compressive strength and high temperature resistance of mortar mixtures were determined. Strength reduction of specimens exposed to 300 degrees C and 600 degrees C were compared. In addition, thermal and scanning electron microscopy (SEM) analyses were performed on the specimens. According to the test results, with the increase in the amount CW and PP fiber in the mixtures, the admixture demand to provide target flow value and the 28-day water absorption capacity of the mixtures increased, while the 28-day compressive strengths decreased. However, while there was no significant change in the 56-day water absorption capacity and compressive strength values of the specimens containing CW, the water absorption capacity increased and the compressive strength decreased upon the presence of fiber in the matrix. The specimens containing both of CW and PP fiber showed better performance in terms of high-temperature resistance.