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Ahmet Sahin Zaimoglu,Ozcan Tan,Rahim Kagan Akbulut 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.2
It is a well-known fact that water content has a significant effect on the engineering properties of fine-grained soils. There is a close relationship between consistency limits and geotechnical parameters of fine-grained soils. This experimental study was performed to investigate the effect of randomly distributed polypropylene fibers (PP) and some additive materials [e.g., Borogypsum (BG), Fly Ash (FA) and Cement (C)] on consistency limits and plasticity index of a fine-grained soil. The Taguchi method was applied to the experiments and standard L9 Orthogonal Array (OA) with four factors and three levels were chosen. A series of consistency limits were conducted on each specimen. 0-20% BG, 0-20% FA, 0-0.25% PP and 0-3% of C by total dry weight of mixture were used in the preparation of specimens. In the tests, distilled water (DW), DW + 0.05% Air-Entrainer (AE) and DW + 0.15% AE were used as mixture liquid. Experimental results showed that the most effective material for decreasing the liquid limit and plasticity index of the samples were fly ash, polypropylene fiber respectively. The plasticity index decreased with increasing of AE. The values of plasticity index for distilled water, distilled water + 0.05% air-entrainer and distilled water + 0.15% air-entrainer in optimum conditions were 16%, 14% and 8%, respectively.
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Ahmet Sahin Zaimoglu 대한토목학회 2015 KSCE JOURNAL OF CIVIL ENGINEERING Vol.19 No.3
A number of studies have been conducted recently to investigate the influence of randomly oriented fibers on some engineeringproperties of cohesive and cohesionless soils. However, few studies have been carried out on fine-grained soils modified withdiscrete fiber inclusions and additive materials. This experimental study was performed to investigate the effect of randomlydistributed Polypropylene fibers (PP) and some additive materials [e.g., Borogypsum (BG), Fly Ash (FA) and Cement (C)] onunconfined compressive strength of a fine-grained soil cured for 7,14 and 28 days. The Taguchi method was applied to theexperiments and a standard L9 Orthogonal Array (OA) with four factors and three levels were chosen. A series of unconfinedcompression tests (7, 14 and 28 days) were conducted on each specimen. 0-20% BG, 0-20% FA, 0-0.25% PP and 0-3% of C by totaldry weight of mixture were used in the preparation of specimens. Experimental results showed that the most effective material forincreasing the unconfined compressive strength of the samples was poly propylene fiber. The values of unconfined compressivestrength for curing times of 7, 14 and 28 days in optimum conditions were 0.94 MPa, 1.25 MPa and 1.95 MPa, respectively.
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Spinal Hydatid Cyst Disease : Challenging Surgery - an Institutional Experience
Caglar, Yusuf Sukru,Ozgural, Onur,Zaimoglu, Murat,Kilinc, Cemil,Eroglu, Umit,Dogan, Ihsan,Kahilogullari, Gokmen The Korean Neurosurgical Society 2019 Journal of Korean neurosurgical society Vol.62 No.2
Objective : Hydatid cyst disease is caused by the parasite Echinococcus granulosus. It is rarely seen in the vertebral system, occurring at a rate of 0.2-1%. The aim of this study is to present 12 spinal hydatid cyst cases, and propose a new type of drainage of the cyst. Methods : Twelve cases of spinal hydatid cysts, surgical operations, multiple operations, chronic recurrences, and spinal hydatic cyst excision methods are discussed in the context of the literature. Patients are operated between 2005 and 2016. All the patients are kept under routine follow up. Patient demographic data and clinicopathologic characteristics are examined. Results : Six male and six female patients with a median age of 38.6 at the time of surgery were included in the study. Spinal cyst hydatid infection sites were one odontoid, one cervical, five thoracic, two lumbar, and three sacral. In all cases, surgery was performed, with the aim of total excision of the cyst, decompression of the spinal cord, and if necessary, stabilization of the spinal column. Mean follow up was 61.3 months (10-156). All the patients were prescribed Albendazole. Three patients had secondary hydatid cyst infection (one lung and two hepatic). Conclusion : The two-way drainage catheter placed inside a cyst provides post-operative chlorhexidine washing inside the cavity. Although a spinal hydatid cyst is a benign pathology and seen rarely, it is extremely difficult to achieve a real cure for patients with this disease. Treatment modalities should be aggressive and include total excision of cyst without rupture, decompression of spinal cord, flushing of the area with scolicidal drugs, and ensuring spinal stabilization. After the operation the patients should be kept under routine follow up. Radiological and clinical examinations are useful in spotting a recurrence.
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Ozcan Tan,Gokhan Gungormus,A. Sahin Zaimoglu 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.6
Injection is one of the methods to improve the engineering properties of bases. Various additions as well as cement are used forpreparations of injection blends in order to lower costs and reach better results. For this purpose in the preparation of the injectionblends, Bentonite (B), Fly Ash (FA) and Silica Fume (SF) were used at the ratios of 0-0.5-1-3%, 10-20-30-40% and 0-5-10-20%,respectively. Taguchi method was applied for the experiment and L16 Orthogonal Array (OA) with three factors and four levels werechosen. Granular bases having 0.70 relative density was settled into a cylindrical mold to which injection blends were injected. Effectof B, FA and SF over the uniaxial compressive strength of the samples of 7, 14, 28 days that have been prepared in this manner wasinvestigated. In results of the experiments it was observed that the most effective parameter over the uniaxial compressive strength of7, 14 and 28 days was silica fume.
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Behavior of polymer columns in soft clayey soil: A preliminary study
Arasan, Seracettin,Akbulut, Rahim Kagan,Isik, Fatih,Bagherinia, Majid,Zaimoglu, Ahmet Sahin Techno-Press 2016 Geomechanics & engineering Vol.10 No.1
Deep soil mixing with cement and cement-lime mixtures has been widely used for decades to improve the strength of soils. In this study, small-scale laboratory model tests of polymer columns in soft clayey soil were conducted to evaluate the feasibility of using various polymeric compounds as binders in deep soil mixing. Floating and end bearing polymer columns were used to examine the load-settlement relationship of improved soft clayey soils for various area replacement ratios. The results indicate that polymer columns show good promise for use in deep mixing applications.
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