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- MakaleYalnız künye2024Scopus SJRQ1Availability of sedimentary and volcanic rock deposits on Northeastern Turkey as concrete aggregates
Çavdar, Ahmet; Çavdar, Özlem
Turkey has large aggregate deposits; however, these deposits cannot be used effectively due to a lack of controls. This can lead to fatal errors, as in the 6 February 2023 Turkey-Syria earthquakes. The main motivation of this study is to investigate the availability of existing and new aggregate deposits as concrete aggregates in northeastern Turkey. Thus, the quality of aggregates in this region will be studied comparatively. This research was carried out with aggregate samples taken from 30 different rock quarries in 10 different provinces in this region of Turkey. First, the locations of 30 crushed rock aggregates were identified, and their petrographic, mineralogical, physical, geometric and durability properties were determined. Fifteen different test procedures were applied to 30 crushed rock samples. It was concluded that these rocks are generally sedimentary rock types and that 18 of these 30 samples are of limestone origin. To obtain high-strength concrete, in addition to quality cement, the aggregates used must also be of high quality. The use of aggregate resources mentioned in this study for building concrete will contribute to the production of high-strength concrete. These samples, which generally have sufficient physical, mechanical and durability properties, meet the limitations of the standards much better than concrete aggregates. High-statistical-performance regression equations were obtained for the physical and durability properties.
AtıfScopus3WoS3OpenAlex5İncele - Yüksek Lisans TeziAçık Erişim2022Reşadiye (Tokat, Türkiye) yöresi pliyosen-kuvaterner yaşlı volkanik kayaçların petrografisi, mineral kimyası, petrokimyası ve petrolojisi
Haydar Zengin
Bu çalışmada, Doğu Pontidler'in güneyinde dar bir alanda yüzeylenen Pliyosen-Kuvaterner yaşlı volkanitlerin petrografik, ana ve iz element içerikleri ile mineral kimyası, verileri, rapor edilmiştir. Petrografik gözlemler, incelenen Pliyosen-Kuvaterner yaşlı volkanik kayaçlar, plajiyoklas (An5-90) + klinopiroksen (Wo2-49 En19-67 Fs11-33) ± hornblend (Mg# 0.51-0.79) + opak mineralleri içerir. Volkanik kayaçların genel dokusunu oluşturan mikrolitik-porfirik, flüidal dokular yanında, plajiyoklaslarda elek dokusu, kemirilmeler, zonlanmalar, klinopiroksenlerde kemirilmeler ve amfibollerde opaklaşmalar ve zonlanmalar dengesizliği ifade eden dokusal özellikler olarak karşımıza çıkar. OOSB (okyanus ortası sırtı bazaltı)'na normalize iz element değişim diyagramlarında, Pliyosen-Kuvaterner yaşlı volkanitler BİLE (Sr, K2O, Rb, Ba), Th ve Ce bakımından zenginleşme, Zr, Y, Nb, Ta ve TiO2.bakımından hafifçe fakirleşme ile karakterize olup, OAB benzeri iz element dağılımları sergilemektedirler. Önemli bir negatif Eu (Eu/Eu*=0.78-1.03) anomalisinin bulunmaması Pliyosen-Kuvaterner yaşlı volcanik kayaçları oluşturan magmalarının gelişimde plajiyoklas ayrımlaşmasının önemli bir yere sahip olmadığını göstermektedir. Birlikte değerlendirilen petrografik, mineral kimyası ve petrokimyasal veriler ışığında; incelenen Pliyosen-Kuvaterner yaşlı bazaltik volkanitlerin ana magmaları, daha önceden yitim akışkanları ve/veya ergiyiklerince zenginleştirilmiş kıta altı litosferik manto kaynağından türeyen ergiyikler ve KAF sisteminin etkisi altında ortaya çıkan astenosferik yükselimden kaynaklanan OAB benzeri magmaların karışımı sonucu sonucunda oluştuğu ve polibarik kristallenme evrelerinden geçerek son halini aldığı söylenebilir.
- MakaleYalnız künye2017Scopus SJRQ3THE USABILITY OF VOLCANIC ROCKS FROM UPPER EUPHRATES PART IN THE EASTERN ANATOLIA REGION AS CONCRETE AGGREGATE
Aksüt, Yavuz Selim; Yetgin, Sukru
In this study; the engineering properties of volcanic rocks obtained from four different quarries in the province of Erzincan region in the Upper Euphrates Part in the Eastern Anatolia Region were investigated. In laboratory studies, the experiments including bulk and aggregate tests (bulk and dense unit weight, specific mass, water absorption, Los Angeles test for resistance to wear, freezing resistance and uniaxial compressive strength) were conducted on 5 volcanic samples according to the standards (Turkish Standard, British Standard and ASTM) and in the second stage, grading of concrete tests (grading of the concrete aggregates, concrete preparation, slump test, specific density of concrete, uniaxial compressive strength, modulus of elasticity, splitting tensile strength, abrasion resistance and capillarity) were performed on the concrete samples with volcanic aggregates. For fresh concrete composition, water/cement ratio was selected as the main variable providing homogeneous mixing and the highest strength to the concrete samples with a specific granulometry. Cylindrical concrete samples were produced with a variety of water/cement ratios cured for 7 and 28 days in water and their compressive strengths were assessed in the light of their physical and mechanical properties. The results obtained from aggregates and concrete tests, which were performed in line with the standards showed that especially Yassitepe-Dogu (YTD) sample, one of the volcanic rocks from Erzincan region can be used as concrete aggregate. It was observed that compressive strength of the concrete samples could satisfy C25/30 strength class and upper classes. In addition, it was understood that they can be used in highways, bridges, dams, buildings etc., especially as structural concrete.
AtıfWoS1İncele - MakaleYalnız künye2010The Alteration Mineralogy and Mass Change of the Zigana (Gumushane) Volcanics of NE Turkey
Sipahi, Ferkan; Sadiklar, M. Burhan
The Late Cretaceous volcanic rocks around Zigana Mountain (Gumushane) in the eastern Black Sea metallogenic province in NE Turkey show intensive hydrothermal alteration but less weathering alteration. The basement of the study area is formed by Late Cretaceous basalt, andesite and their pyroclastics. These rocks are overlain by dacitic rocks of the same age, namely Dacite-I and Dacite-II. These volcanic rocks are bimodal in character and have developed in a volcanic arc environment. The volcanic rocks in the study area have been altered to the sericite/illite-chlorite facieses, and contain sericite/illite, chlorite, quartz, carbonate minerals (ankerite and calcite), iron-oxide, and rare kaolinite, smectite and epidote as the products of alteration. Sericitization/illitization is the most common type of hydrothermal alteration associated with these volcanics, and chloritization is the most common alteration type after illitization; pyritisation is seen in all volcanics, and is the most common in dacites. In some fields limonitisation is occasionally present. Epidotization is rare, and especially seen in basalt and andesite. Isocon analysis was undertaken to estimate the mass gains and losses of the Zigana Volcanics as a result of hydrothermal alteration. In general terms, the results shows that, basalt and andesite have 2-61% mass gain, Dacite-I 71% mass gain and 42 % mass loss, and Dacite-II 44% mass gain and 32% mass loss. Namely, both mass gain and mass loss occurred in the volcanics during the hydrothermal alteration of the parent materials. From less altered rock to highly altered rock there was an increase in illite-chlorite-kaolinite whereas there was a decrease in carbonate minerals. In the volcanics, fluids which cause sericitization and chloritization did not increase metals like Cu, Pb and Zn and, in fact, it can be said that these fluids are poor in point of these metals. This also shows that the metals developed under different hydrothermal conditions.
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