1. Use of Lignin, Waste Tire Rubber, and Waste Glass for Soil StabilizationSüleyman Gücek, Cahit Gürer, Bojan Žlender, Murat V. Taciroğlu, Burak E. Korkmaz, Kürşat Gürkan, Tamara Bračko, Borut Macuh, Rok Varga, Primož Jelušič, 2024, izvirni znanstveni članek Opis: The complex interactions between soil and additives such as lignin, glass powder, and rubber tires were investigated using principles of material and soil mechanics. Previous research has mainly focused on individual additives in clay soils. In contrast, this study investigates soil improvement with two different types of waste materials simultaneously. The improvement of soil properties by hybrid waste materials was evaluated using several laboratory tests, including the standard Proctor test, the unconfined compressive strength test, the California Bearing Ratio (CBR) test, and cyclic triaxial tests. The aim of this research is to identify key parameters for the design and construction of road pavements and to demonstrate that improving the subgrade with hybrid waste materials contributes significantly to the sustainability of road construction. The mechanical and physical properties were evaluated in detail to determine the optimal mixtures. The results show that the most effective mixture for the combination of waste glass powder and rubber tires contains 20% glass powder and 3% rubber tires, based on the dry weight of the soil. For the combination of waste glass powder and lignin, the optimum mixture consists of 15% glass powder and 15% lignin, based on the dry weight of the soil. These results provide valuable insights into the sustainable use of waste materials for soil stabilization in road construction projects.
Ključne besede: soil stabilization, waste glass, tire rubber waste, lignin, hybrid waste usage, mechanical
properties, pavement structure
Objavljeno v DKUM: 28.02.2025; Ogledov: 0; Prenosov: 2
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2. Potential of using waste materials in flexible pavement structures identified by optimization design approachPrimož Jelušič, Süleyman Gücek, Bojan Žlender, Cahit Gürer, Rok Varga, Tamara Bračko, Murat V. Taciroğlu, Burak E. Korkmaz, Şule Yarcı, Borut Macuh, 2023, izvirni znanstveni članek Opis: This paper presents the design of geosynthetic reinforced flexible pavements and their modification by incorporating waste materials into bonded and unbonded layers of the pavement structure. The optimal design of flexible pavements was achieved by minimizing the construction cost of the pavement. The incorporation of waste materials into the pavement structure affects the material properties. Therefore, along with the traffic load, the effects of the material properties of the asphalt concrete, base layer, sub-base layer, and subgrade were analyzed in terms of pavement structure costs and CO2 emissions of materials used in pavement construction. In addition, a comparison was made between pavements with and without geosynthetic reinforcement in terms of design, optimum construction cost, and CO2 emissions. The use of geosynthetics is even more effective in pavement structures that contain waste materials in an unbound layer, both in terms of cost and CO2 emissions. The minimum value of the California Bearing Ratio of the subgrade was determined at which the use of geosynthetic reinforcement for pavement structure with and without the inclusion of waste materials is economically and sustainably justified. The use of geosynthetics could result in a 15% reduction in pavement structure cost and a 9% reduction in CO2 emissions due to the reduced thickness of unbound layers. In addition, reducing the CBR of the unbound layer from 100% to 30% due to the inclusion of waste materials implies a cost increase of up to 13%. While the present study is based on an empirical pavement design method in which pavement thickness is limited by the pavement thickness index, the same minimum thicknesses are obtained in the optimization process regardless of whether the objective function is the minimum construction cost or minimum CO2 emissions.
Ključne besede: pavement design, waste materials, optimization, minimum construction cost, CO2 emissions, geosynthetics, waste management
Objavljeno v DKUM: 18.09.2023; Ogledov: 644; Prenosov: 56
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3. Implementation of climate change effects on slope stability analysisTamara Bračko, Bojan Žlender, Primož Jelušič, 2022, izvirni znanstveni članek Opis: The objective of this study is to determine the impacts of expected climate change on slope stability. For this purpose, the case study of a slope instability, that was triggered in 2021 was selected. The stability analysis was performed considering the theory of rainfall infiltration and using Geo-Studio’s SEEP/W module for the surface infiltration model of the slope. A parametric stability analysis of the slope was conducted to determine the importance of climate change on slope stability. Conditions for changes in volumetric water content, water permeability, porewater pressure, and groundwater flow are important. When soil permeability is low, the factor of safety decreases during rainfall events and on the days following, while when permeability is higher, safety increases after rainfall events. The effect of lower cohesion is nearly linear, with the factor of safety decreasing by 0.1 for every 1 kPa less cohesion. The increase in net infiltration of water may be the most critical factor for slope instability. The results of the analysis indicate that timely reduction of water net infiltration through planting and proper surface water runoff from the upper road and slope would be a relatively simple and inexpensive measure compared to the cost of remediating the landslide, considering expected climate change. Therefore, it is advisable to analyze all slopes with respect to the expected climate change, taking into account the potential impacts of climate change.
Ključne besede: climate change adaptation, slope stability, rainfall infiltration, water net infiltration, seepage analyses
Objavljeno v DKUM: 18.08.2023; Ogledov: 478; Prenosov: 978
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4. Participatorni pristop k obnovi in oživljanju Loč : 'Povežimo Loče'Nande Korpnik, Kaja Pogačar, Marko Renčelj, Igor Frim, Martin Zidanšek, Rok Peternel, Aljaž Kores, Katarina Kobale, Špela Cenc, David Obrovnik, Tamara Bračko, Sanja Špindler, Iris Fras, 2020, končno poročilo o rezultatih raziskav Ključne besede: urbanizem, informacijsko modeliranje gradbenih objektov, raziskovalni projekti
Objavljeno v DKUM: 27.02.2020; Ogledov: 1671; Prenosov: 194
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5. Primerjava metod za izračun hrupa NMPB 1996 in CNOSSOS ob uporabi realnih in modelskih vhodnih podatkovTamara Bračko, 2019, magistrsko delo Opis: V magistrskem delu smo proučevali obremenjenost okolice Ceste proletarskih brigad v Mariboru s hrupom cestnega prometa. Izračune hrupa smo opravili po metodah NMPB 1996 in CNOSSOS ob uporabi realnih in modelskih vhodnih podatkov. Pozornost smo namenili postopku pridobivanja vhodnih podatkov, njihovi kakovosti in analizi rezultatov različnih metod. Za različne scenarije smo izračunali zvočno moč cestnega prometa in izdelali karte hrupa. Pridobljeni podatki o površinah raziskovalnega območja, na katerih so kazalci hrupa prekoračeni, so bili osnova za izračun števila stavb in prebivalcev, ki so obremenjenih s hrupom cestnega prometa, in predloge omilitvenih ukrepov. Rezultati so pokazali, da je metoda NMPB 1996 primernejša za uporabo, saj ima metoda CNOSSOS pomanjkljivosti v zvezi s širjenjem hrupa. Z realnimi vhodnimi podatki se bolje opiše stanje okolja kot z modelskimi, vendar je njihovo pridobivanje kompleksnejše, dolgotrajnejše in dražje, zato se njihova raba priporoča v primeru študij na manjših in gosto poseljenih območij z močno obremenjenimi cestami.
Ključne besede: Maribor, Cesta proletarskih brigad, hrup cestnega prometa, metodi NMPB 1996 in CNOSSOS, realni/modelski vhodni podatki
Objavljeno v DKUM: 19.09.2019; Ogledov: 1326; Prenosov: 230
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6. OSVETLJENOST PREHODOV ZA PEŠCETamara Bračko, 2017, delo diplomskega projekta/projektno delo Opis: Z modernizacijo se je spremenil način življenja ljudi. Vedno več je tudi cest, katere nam omogočajo da živimo »moderni« način življenja, ki pa je tudi vse hitrejši. Posledično vse več ljudi uporablja avtomobile, saj tako hitreje pridejo do željenega cilja. Zato je še toliko bolj pomembno, da ne pozabimo strmeti k temu, da bodo tudi prehodi za kolesarje in pešce čim bolj varni.
Naloga predstavlja štiri naključno izbrane prehode za pešce v Mariboru, ki so premalo osvetljeni in tako nevarni za pešce.
Prikazuje tudi kako bi se z majhnim vložkom povečanja osvetljenosti, varnost prehodov povečala in posledično zmanjšala možnost nastanka prometne nezgode zaradi slabe vidljivosti.
Na koncu diplomske naloge je izračunan tudi dejanski strošek povečanja osvetljenosti teh prehodov.
Ključne besede: promet, prehod za pešce, osvetljenost, varnost pešcev, označitev prehodov, analiza stroškov osvetljenosti, javna razsvetljava
Objavljeno v DKUM: 28.09.2017; Ogledov: 2235; Prenosov: 413
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