Yazar "Ciflikli, Murat" seçeneğine göre listele

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    Determination of heavy metals in soils around Afsin-Elbistan Thermal Power Plant (Kahramanmaras, Turkey)
    (ASIAN JOURNAL OF CHEMISTRY, 2008) Tumuklu, Ali; Ciflikli, Murat; Ozgur, F. Zafer
    In this study, heavy metal (V, Ti, Cr, Mn, Ni, Cu, Zn, As, Sn, Al, Mg and Fe) pollution of the soils around Afsin-Elbistan Thermal Power Plant have been investigated. When the average values of the 21 analysis results were compared with the crystal values, V:1.03. Ti:0.64, Cr:3.51, Mn:1.02, Ni:6.48, Cu:3.31, Zn:1.56, As:3.09, Sn:0.51, A:0.71, Mg:1.25 and Fe:1.25 values were determined. According to these comparisons, the exchange rates in the study area are as follows: Ni > Cr > Cu > As > Mg and Fe > Zn. According to the relationships between distance and sampling locations of the samples (sample numbers 1-16) collected through a line from the area between power plant and Afsin district, distances (km) where the elements were determined in their maximum values are as follows: Ni:3, Mg:3, Cr:5, Ti:8 Mn:8, Cu:8, Fe:9. V:9. Zn:9, As:9. Sn:14 and Al:15. According to the results of XRD whole rock analysis, mineral associations found as clay, calcite, quartz, feldspar, mica, hematite and rarely clinoptilolite and opal-CT. Clay mineral assemblages are montmorillonite, illite, kaolinite, notronite and halloysite.
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    Examination of mechanical properties and microstructure of alkali activated slag and slag-metakaolin blends exposed to high temperatures
    (Ernst & Sohn, 2022) Akcaozoglu, Semiha; Ciflikli, Murat; Bozkaya, Omer; Atis, Cengiz Duran; Ulu, Cuneyt
    This paper reports an experimental study of the influence of elevated temperature on alkali activated slag (AAS) and slag-metakaolin (MK) systems. The residual compressive and flexural tensile strengths, ultrasonic pulse velocity (UPV) and porosity and water absorption ratios of AAS and AAS-MK composites after subjected to elevated temperatures of 200, 400, 600, 800, and 1000 degrees C were investigated. Two different procedures were applied for cooling the specimens. The changes in the microstructure of the composites after subjected to high temperature were examined with scanning electron microscope and X-ray diffraction. Test results reveal that depending on the increasing temperature, the residual compressive strength, flexural tensile strength, and UPV values of the specimens decreased, and porosity and water absorption ratios increased. The minimum strength results of AAS and AAS-MK specimens were observed at 800 and 600 degrees C, respectively. In particular, there have been significant changes in the internal structure of AAS and AAS-MK specimens exposed to 1000 degrees C and new reaction products were observed. Test results have shown that AAS specimens are a new alternative that can be developed for use in environments exposed to high temperatures. Since this new composite contains only slag binder and slag aggregate, it can be an economical product that use fully recycled material and these properties can increase the application areas of environmentally friendly material.
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    Hydrothermal alteration-related kaolinite/dickite occurrences in ignimbrites: an example from Miocene ignimbrite units in Avanos, Central Turkey
    (Springer Heidelberg, 2020) Ciflikli, Murat
    Miocene-Quaternary volcanic complexes associated ignimbrites from the Cappadocia Volcanic Province in Central Anatolia have been subjected to hydrothermal alteration which produced several industrial clay mineralizations. This study focuses on the hydrothermally altered Late Miocene dacitic to trachy-andesitic ignimbrites in the Avanos region and aimed to determine the alteration in terms of conditions and origin. Hydrothermally altered samples consist mainly of quartz and kaolin group clays, and minor amounts of goethite/limonite, alunite, jarosite, illite, and mixed-layered illite-smectite. The kaolinite and dickite associations were principally determined from the diagnostic XRD peaks and confirmed by FTIR and SEM data. They have fine-grained and pseudo-hexagonal uniform-kaolinite and prolonged-dickite-shaped platelets as tightly packed vermicular booklets. The kaolinite and dickite association with fine-grained alunite and jarosite point out the steam-heated igneous environments at shallow depth level. Hydrothermal alteration-related minerals occurred as replacement of volcanic glass/groundmass and neoformation in the pores from the acidic hydrothermal solutions. The mineralogical associations suggest that the hydrothermal alteration occurred in acidic and moderate temperature conditions. Major and trace element compositions of altered samples exhibit distinct differences with respect to the host-rock composition. Chondrite normalized LREE contents increase, whereas HREE contents decrease in altered ignimbrites with respect to unaltered ignimbrite. The oxygen and hydrogen isotope data of kaolinite/dickite demonstrate that magmatic vapor phases mixed with meteoric waters. The steam-heating-related igneous environment seems to be responsible for magmatic vapors which circulated along the crack zones within the acidic volcanogenic rocks, and therefore the acidic conditions caused kaolin-dominant alteration.
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    Influence of calcined diatomite content and elevated temperatures on the properties of high strength mortars produced with basalt sand
    (Ernst & Sohn, 2020) Saridemir, Mustafa; Celikten, Serhat; Ciflikli, Murat; Karahancer, Mustafa
    In this paper, the effect of calcined diatomite (CDT) content on the mechanical, microstructural, and mineralogical properties of high strength mortars (HSMs) exposed to 25, 400, 600, 800, and 1,000 degrees C temperatures is investigated. The percentages of CDT that replace Portland cement (PC) in this work are 0, 5, 10, 15, and 20%, by weight. The researched properties of the HSMs are the unit weight (U-w), ultrasonic pulse velocity (U-pv), flexural strength (f(s)), compressive strength (f(c)) and the analyses of X-ray powder diffraction, polarized light microscopy, and scanning electron microscopy/energy dispersive spectroscopy. The experimental results show that the CDT has a potential to be successfully employed as a partial replacement of PC in the HSMs exposed to elevated temperatures. The optimal replacement level of PC by CDT is determined as 15% from strength tests. Besides, the U-w, U-pv, f(s), and f(c) values progressively reduce as the temperatures subjected to the HSMs increase. The CDT has a positive effect on the f(s) and f(c) values the HSMs after exposure to elevated temperatures.
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    Microstructural Analyses of High Strength Concretes Containing Metakaolin at High Temperatures
    (Springer, 2017) Saridemir, Mustafa; Severcan, Metin Hakan; Ciflikli, Murat; Celikten, Serhat
    In this study, the effects of high temperatures on the mechanical and microstructural properties of high strength concretes (HSCs) containing metakaolin (MK) are investigated. For this purpose, the concrete mixtures containing MK were produced with a water-binder ratio of 0.2. The mechanical properties of these concretes at 25, 250, 500 and 750 degrees C temperatures were determined. Besides, the effect of high temperature on the microstructural properties of cementitious matrix, interfacial transition zone between cement and aggregates, and aggregates of concretes were inspected by X-ray diffraction, scanning electron microscope and plane polarized transmitted light (PPTL) analyses. The results indicate that the ultrasound pulse velocity (U-pv), compressive strength (f(c)), flexural strength (f(fs)) and splitting tensile strength (f(sts)) values of these concretes decrease with the increasing of the high temperature especially after 250 degrees C. The heated concrete specimens were also examined at both macro- and micro-scales to determine the discoloration, alteration and cracks of HSC at different temperatures. PPTL analyses show that increasing temperature causes impairing of interfaces between aggregate particles and cementitious materials. The results also show that the partial replacement of 10 % MK with cement has the best performance on the mechanical properties of HSC.