Influence of afşin-elbistan highly limy fly ash on engineering behavior of a cohesive soil

The study was aimed to evaluate effectiveness of utilizing a self-cementing fly ash derived from combustion of lignite at Af¸in Elbistan thermal power plant in stabilizing a fine grained clayey soil (CL). Grain size and Atterberg limits analysis, compaction and triaxial compression tests were carried out on the clayey soil samples (pure soil) and also the samples of soil mixtures added various percentage of fly ash were prepared. The samples were used for triaxial compression test at optimum moisture contents determined by standard proctor test. The test results revealed denote that the shear strength of soil increases considerably with both addition of fly ash and curing time. Furthermore, the fly ash treatment and curing process brings also soil in more granular nature due to flocculation of the clay particles by cementation. It is clearly seen that Af¸in Elbistan power plant fly ash is a very suitable material for improving of fine grained cohesive soils. Furthermore, utilization of Af¸in Elbistan fly ash in soil stabilization was determined a positive influence on the environment and the economy. © 2010 Academic Journals

Water content and temperature effect on ultrasonic pulse velocity of concrete

In this paper, water content and temperature effect on the ultrasonic pulse velocity (UPV) of concrete was investigated. A series of tests were performed to examine the relationship between water content and UPV of concrete with different aggregate mixture proportions. Cube test specimens were made of concrete with water-cement ratio of 0.5. The concrete specimens were immersed in water for 90 days to saturate them. To measure the effect of different water contents on UPV, the test specimens were dried gradually to change the amount of water between measurements. This process was repeated until the concrete pieces was completely dried and weight no longer changed. The water content could be changed from about 6 to 0%. Following, another test procedure was conducted to research the relationship between temperature and UPV. To measure the influence of various temperature on UPV, completely dried concrete specimens were firstly cooled to –18°C and gradually heated to +180°C. In these two different procedures, the UPV values corresponding water content and temperature in the relevant ranges were periodically measured. The test results indicate that the increase in both water content and temperature increases almost linearly UPV of concrete. Based on correlation derived from the test data, irrespective of concrete properties a further increase in both water content of 1% and temperature of 10°C increases UPV of average 160 and 34 m/s, respectively. As overall assessment, this study demonstrates that the UPV is a function of both water content and temperature, and the changing of these two parameters has an important influence on ultrasonic pulse velocity of concrete. © 2017, Pleiades Publishing, Ltd

Effect of length-to-diameter ratio on the unconfined compressive strength of cohesive soil specimens

In this work, the influence of the length-to-diameter ratio (L/D) on the unconfined compressive strength (UCS) of cohesive soil specimens was assessed. An L/D ratio of between 2 and 3 is generally recommended by accepted scientific and technical authorities. Nevertheless, published reports on the effect of specimen shape on soil strength are scarce. Therefore, we determined the effect of specimen shape on the UCS values of four clay soils by testing compacted cylindrical specimens with L/D ratios ranging from 0.5 to 3. The test results indicated that the UCS value decreases significantly with increasing L/D ratio. This decrease becomes particularly steep when the L/D ratio exceeds 1, but then becomes less steep when the L/D ratio is between 1.25 and 2.5. In addition, the failure pattern generally changes from ductile to brittle and the failure mechanism develops in quite complex and obscure ways when the L/D ratio is ?2.75. Based on an analysis of the results, correction formulae with strong statistical relationships were determined for the soils tested in this study. Nonetheless, further investigation is needed to check the validity of the equations derived for these soils. © 2015, Springer-Verlag Berlin Heidelberg

Paleoseismology of the Palu-Lake Hazar segment of the East Anatolian Fault Zone, Turkey

The East Anatolian Fault Zone (EAFZ) is among the most important active continental transform fault zones in the world as testified by major historical and minor instrumental seismicity. The first paleoseismological exploratory trenching study on the EAFZ was done on the Palu-Lake Hazar segment (PLHS), which is one of the six segments forming the fault zone, in order to determine its past activity and to assess its earthquake hazard. The results of trenching indicate that the latest surface rupturing earthquakes on this segment may be the Ms=7.1+ 1874 and Ms=6.7 1875 events, and there were other destructive earthquakes prior to these events. The recurrence interval for a surface rupturing large (M>7) earthquake is estimated as minimum 100±35 and maximum 360 years. Estimates for the maximum possible paleoearthquake magnitude are (Mw) 7.1-7.7 for the Palu-Lake Hazar segment based on empirical magnitude fault rupture relations. An alluvial fan dated 14,475-15,255 cal years BP as well as another similar age fan with an abandoned stream channel on it are offset in a left-lateral sense 175 and 160.5 m, respectively, indicating an average slip rate of 11 mm/year. Because 127 years have elapsed since the last surface rupturing event, this slip rate suggests that 1.4 m of left-lateral strain has accumulated along the segment, ignoring possible creep effects, folding and other inelastic deformation. A 2.5 Ma age for the start of left-lateral movement on the segment, and in turn the EAFZ, is consistent with a slip rate of 11 mm/year and a previously reported 27 km total left-lateral offset. The cumulative 5-6 mm/year vertical slip rate near Lake Hazar suggests a possible age of 148-178 ka for the lake. Our trenching results indicate also that a significant fraction of the slip across the EAFZ zone is likely to be accommodated seismically. The present seismic quiescence compared with the past activity (paleoseismic and historic) indicate that the EAFZ may be "locked" and accumulating elastic strain energy but could move in the near future. © 2003 Elsevier B.V. All rights reserved.National Council for Scientific ResearchThis study was financially supported by the Scientific and Technical Research Council of Turkey (TÜB I ı TAK) (Project No. YDABÇAG-550). Mr. I ı brahim Altuntaş of COŞTAŞ Madencilik Çimento ve I ı nşaat Sanayi Ticaret Limited Şirketi in Malatya generously paid for three of the radicarbon dating samples. Financial support was also provided by Çukurova University Research Foundation (Project Nos. ULS.97.MMF.21, ULS.99.MMF.28, MMF.99.20 and FBE.2000.D.10). We thank Dr. James McCalpin and Giuliana D'Addezio for their critical and valuable comments on the manuscript. The interpretations of the trench logs benefited considerably from invaluable comments of Dr. James McCalpin. We are grateful to Dr. Fuat Şaroğlu for his continuous support and encouragement throughout the study. We also thank the Mineral Research and Exploration Institute of Turkey (MTA) and General Headquarters for Mapping of the Turkish Army for allowing to use 1:10,000 and 1:35,000 scales aerial photos of the study area, respectively

Determination of the thermal conductivity from physico-mechanical properties

Samples of limestone, dolomite, dolomitic limestone, marble, travertine, sandstone, siltstone, andesite, basalt and porous basalt from different parts of Turkey were tested to obtain their UCS, porosity, water absorption, density, P-wave velocity and thermal conductivity (TC). It was observed that while TC increased with density, P-wave velocity and UCS, it decreased with increasing porosity. Equations are presented to allow an assessment of TC from these physico-mechanical properties. © Springer-Verlag 2008.Firat University Scientific Research Projects Management UnitAcknowledgments This study was partly supported by the Scientific Research Projects Unit of Cukurova University, Adana, Turkey. (Project No: MMF2003BAP13 and MMF 2005BAP6)

Critical-state parameters of an unsaturated residual clayey soil from Turkey

This paper deals with the evaluation of the critical-state parameters with respect to the matric suction for saturated and unsaturated undisturbed residual clayey soils from Turkey. In order to conduct the unsaturated triaxial compression testing procedures a conventional triaxial compression apparatus was redesigned. The data for critical-state conditions from these tests are presented with respect to matric suction, based on the critical-state parameters of M, qo, ?, ?, which is commonly proposed by many authors. The critical state of the unsaturated samples is compared with that of the saturated samples. This experimental study has demonstrated that matric suction has no influence on parameters of M and ?. The parameters of M and ? are approximately 0.85 and 0.074 respectively for saturated and unsaturated conditions. The relationships between matric suction (ua - uw) and the intercepts qo and ? have been observed as nonlinear, and thus they can be defined as a function of matric suction (ua - uw). Furthermore, a method is developed to predict the intercepts q0 according to matric suction for unsaturated clayey soils. © 2007 Elsevier B.V. All rights reserved

Endovascular management of iatrogenic renal arterial lesions and clinical outcomes

PURPOSE We aimed to evaluate iatrogenic renal arterial lesions, including pseudoaneurysm, arteriovenous fistula, and arteriocaliceal fistula, their management by endovascular embolization, and the clinical results. METHODS Fifty-five patients (forty males, fifteen females) with a median age of 40 years (range, 8–85 years), who underwent endovascular embolization of iatrogenic renal arterial lesions between March 2003 and December 2013 were included in this retrospective study. Types of iatrogenic lesions and details of embolization procedures were reported. Estimated glomerular filtration rate (eGFR), renal function tests, hemoglobin, and hematocrit levels before and after embolization were recorded and compared. RESULTS Median follow-up was 24 months. We identified 53 pseudoaneurysms, 30 arteriovenous fistulas, and 11 arteriocaliceal fistulas in 55 patients, after percutaneous nephrolithotomy (n=26), renal biopsy (n=21), nephrostomy (n=3), renal surgery (n=3), and extracorporeal shock wave lithotripsy (n=2). Median number of pseudoaneurysms was 1 (range, 1–4) with a median size of 7 mm (range, 1.5–35 mm). Fifty-one patients underwent coil embolization. Median number of coils was 5 (range, 2–21) and median renal parenchymal loss was 5% (range, 1%–50%). There were no significant differences between pre- and postoperative eGFR and serum parameters. CONCLUSION Iatrogenic renal arterial lesion can be a life threatening condition. Superselective coil embolization is a safe, minimally invasive treatment option with minimal renal parenchymal loss and without significant change in renal function. © Turkish Society of Radiology 2015

Idiopathic thoracic spinal epidural lipomatosis causing spinal cord compression

[No abstract available

Imaging findings and endovascular management of iatrogenic hepatic arterial injuries

PubMed ID: 26359873Iatrogenic hepatic arterial injuries (IHAIs) include pseudoaneurysm, extravasation, arteriovenous fistula, arteriobiliary fistula, and dissection. IHAIs are usually demonstrated following percutaneous transhepatic biliary drainage, percutaneous liver biopsy, liver surgery, chemoembolization, radioembolization, and endoscopic retrograde cholangiopancreatography. The latency period between the intervention and diagnosis varies. The most common symptom is hemorrhage, and the most common lesion is pseudoaneurysm. Computed tomography angiography (CTA) is mostly performed prior to angiography, and IHAIs are demonstrated on CTA in most of the patients. Patients with IHAI are mostly treated by coils, but some patients may be treated by liquid embolic materials or stent-grafts. CTA can also be used in the follow-up period. Endovascular treatment is a safe and minimally invasive treatment option with high success rates. © Turkish Society of Radiology 2015

Liver abscess following radioembolization with yttrium-90 microspheres [Leberabszess nach Radioembolisation mit Yttrium-90 Mikrosphären]

PubMed ID: 25234938Radioembolization with yttrium-90 microspheres is an accepted and useful intervention model with minimal invasion in both primary and secondary liver malignancies. Radioembolization may lead to some complications. Liver abscess is a rare complication that can occur several weeks after radioembolization treatment of liver tumor with yttrium-90 microspheres. There are only a few case reports on hepatic liver abscess observed in early term of radioembolization treatment, and our case also constitutes a rare report that may contribute to the possible future improvements in radioembolization field to get more insight into the current understanding of the formation of some deleterious insults such as hepatic abscess. © Springer-Verlag Wien 2014