7 results on '"Vukićević, Mirjana"'
Search Results
2. Stabilization of fine-grained soils with fly ash
- Author
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Vukićević, Mirjana, Pujević, Veljko, Marjanović, Miloš, Jocković, Sanja, and Maraš-Dragojević, Snežana
- Subjects
fly ash ,fine-grained soil ,soil stabilization ,lcsh:TA1-2040 ,stabilizacija tla ,leteći pepeo ,sitnozrnato tlo ,posmična čvrstoća ,CBR ,shear strength ,lcsh:Engineering (General). Civil engineering (General) - Abstract
U radu su prikazani rezultati laboratorijskog ispitivanja stabilizacije tla letećim pepelom bez primjene aktivatora. Ispitivane su dvije vrste sitnozrnatog tla: glina niske do srednje plastičnosti te vrlo ekspanzivna glina srednje do visoke plastičnosti. Mješavine tla i letećeg pepela su pripremljene s optimalnom količinom pepela (15 i 20 %). Ispitivan je utjecaj letećeg pepela na plastičnost tla, odnos vlage i gustoće, jednoosnu tlačnu čvrstoću, vrijednosti parametara posmične čvrstoće, vrijednosti CBR-a (California Bearing Ratio-CBR), deformacije i potencijal bujanja. Dobiveni rezultati pokazuju da primjena letećeg pepela može značajno poboljšati svojstva tla., Results of laboratory research focusing on soil stabilization, using fly ash without activators, are presented in the paper. Two types of fine-grained soils were tested: low to medium plasticity clay and very expansive, medium to high plasticity clay. Soil-fly ash mixtures were prepared at optimum fly ash contents (15 and 20 %). The effects of fly ash on the soil plasticity, moisture-density relationship, unconfined compressive strength, shear strength parameters, CBR (California Bearing Ratio) values, deformation parameters, and swell potential, were evaluated. Results obtained show that the use uf fly ash can significantly contribute to the improvement of soil properties.
- Published
- 2015
3. Stabilizacija alevrita primenom pepela iz termoelektrane 'Kolubara'
- Author
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Vukićević, Mirjana, Maraš-Dragojević, Snežana, Jocković, Sanja, Marjanović, Miloš, and Pujević, Veljko
- Subjects
fly ash ,fine-grained soil ,soil stabilization - Abstract
This paper presents the results of laboratory research of fly-ash soil stabilization. Tests were conducted on mixtures with alevrite - very expansive, medium to high plasticity clay and fly ash sampled in thermo electric power plant ”Kolubara”. Effects of fly ash on physical and mechanical properties of soil (grain size distribution, Atterberg limits, moisture-density relationship, unconfined compression strength, effective shear strength parameters, CBR, deformation parameters, swell potential) were evaluated. Results of the research indicate that fly ash can effectively improve some engineering properties of soil. The most significant improvement is the increase in CBR values and reduction of swell potential because it makes this material usable for road construction.
- Published
- 2013
4. FLY ASH AND SLAG UTILIZATION FOR THE SERBIAN RAILWAY SUBSTRUCTURE.
- Author
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Vukićević, Mirjana, Popović, Zdenka, Despotović, Jovan, and Lazarević, Luka
- Subjects
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FLY ash , *SLAG , *RAILROAD safety measures , *STEAM power plants & the environment , *POZZOLANIC reaction - Abstract
Approximately 7 million tons of fly ash and slag are produced in thermal power plants in Serbia every year, only 3% of which is used in the cement industry. About 300 million tons of the ash-slag mixture are disposed in landfills, occupying an area of approximately 1600 hectares and generating environmental issues. Fly ash from Serbian power plants has pozzolanic properties and due to low concentration of calcium compounds (less than 10% CaO), they do not have self-cementing properties. According to the ASTM C618-15, this ash is from class F. According to the European Standard EN 197-1:2011, this ash is siliceous (type V) ash. From April 2014 to May 2015, an investigation of engineering properties of fly ash and mixtures of fly ash and slag from landfill (without or with binders of cement/lime) was conducted at the Laboratory of Soil Mechanics at the Faculty of Civil Engineering of the University of Belgrade (Serbia) and at the Institute for Testing of Materials - IMS Institute in Belgrade. The laboratory test results were showed in the study 'Utilization of fly ash and slag produced in the TPP JP EPS thermal power plants for construction of railways'. Four kinds of waste materials from Serbian power plants were laboratory tested: (a) an ash-slag mixture from landfills at the 'Nikola Tesla A' thermal power plant; (b) fly ash from silos in the 'Nikola Tesla B' thermal power plant; (c) an ash-slag mixture from landfills at the 'Kostolac A' and 'Kostolac B' thermal power plants and 'Srednje kostolačko ostrvo' landfill; (d) fly ash from the 'Kostolac' thermal power plant. The following physical and mechanical properties of ash and mixtures were investigated: grain size distribution, Atterberg limits, specific gravity, moisture-density relationship, shear strength parameters in terms of effective stresses, California Bearing Ratio (CBR), and deformation parameters. The paper presents the results of laboratory tests of the materials with and without binders, and based on the laboratory results and previous research, the paper presents possibilities of using fly ash and slag for the construction of railway substructure in the planned construction and reconstruction of railway network in Serbia. The obtained results indicate that tested fly ash and ash-slag mixture have met the technical requirements and that they have the potential to be used in railway substructure. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
5. Soil stabilization using the fly ash - international experience and initial results of own research
- Author
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Vukićević, Mirjana and Marjanović, Miloš
- Subjects
fly ash ,soil stabilization ,soil modification - Abstract
This paper presents the most imporant results of published international researches about soil stabilization using fly ash. The reaction mechanism of fly ash on important physical and mechanical properties of soil is described. Also, the own laboratory testing results of improving the soil from the borrow pits at the site of the future regional waste management center “Kalenić” in village Kalenić, by adding the fly ash from thermal power plant “Kolubara” are presented.
- Published
- 2012
6. Neki geotehnički aspekti izgradnje regionalnog centra za upravljanje otpadom 'Kalenić' u selu Kalenić
- Author
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Vukićević, Mirjana and Marjanović, Miloš
- Subjects
fly ash ,soil stabilization ,solid waste landfill ,soil testing - Abstract
Future regional waste management center ”Kalenić” is modern system that in controlled manner ensures the protection of the environment from waste materials. Geotechnical conditions have an enormous significance for the construction and proper functioning of such facility. In this paper, a brief overview of future regional landfill nad geotechnical characteristics of the terrain, obtained by laboratory testing, are presented. Special attention is devoted to the analysis of the applicability of fly ash from the "Kolubara" power plant to improve the characteristics of existing material to be used for the construction of embankments, with the presentation of the results of laboratory tests conducted.
- Published
- 2011
7. The Alternatives to Traditional Materials for Subsoil Stabilization and Embankments.
- Author
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Vukićević, Mirjana, Marjanović, Miloš, Pujević, Veljko, and Jocković, Sanja
- Subjects
- *
EMBANKMENTS , *FLY ash , *SOIL stabilization , *WASTE products , *PARTICLE size distribution , *SHEAR strength of soils , *SUBSOILS - Abstract
Major infrastructure projects require significant amount of natural materials, often followed by the soft soil stabilization using hydraulic binders. This paper presents the results of a laboratory study of alternative waste materials (fly ash and slag) that can be used for earthworks. Results of high plasticity clay stabilization using fly ash from Serbian power plants are presented in the first part. In the second part of the paper, engineering properties of ash and ash-slag mixtures are discussed with the emphasis on the application in road subgrade and embankment construction. Physical and mechanical properties were determined via following laboratory tests: Specific gravity, grain size distribution, the moisture–density relationship (Proctor compaction test), unconfined compressive strength (UCS), oedometer and swell tests, direct shear and the California bearing ratio (CBR). The results indicate the positive effects of the clay stabilization using fly ash, in terms of increasing strength and stiffness and reducing expansivity. Fly ashes and ash-slag mixtures have also comparable mechanical properties with sands, which in combination with multiple other benefits (lower energy consumption and CO2 emission, saving of natural materials and smaller waste landfill areas), make them suitable fill materials for embankments, especially considering the necessity for sustainable development. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
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