Yazar "Yilmaz, Bahadir" seçeneğine göre listele

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    Assessment of Thermal Properties of Nanoclay-Modified Bitumen
    (Springer Heidelberg, 2023) Yilmaz, Bahadir; Ozdemir, Ahmet Munir; Gurbuz, Havanur Ebru
    In this study, B50/70 penetration grade original bitumen was modified by adding nanoclay at 2%, 4%, 6%, and 8% ratios. Subsequently, penetration, softening point, and rotational viscometer tests were performed on non-aged and short-term aged samples. The effect of nanoclay addition to bitumen on the susceptibility of bitumen to high temperature was evaluated with different equations. Since the central focus of the study is to assess the temperature susceptibility and the reaction to thermal changes of the nanoclay added bitumen, a differential scanning calorimetry experiment was performed on the samples, and the temperature susceptibility criteria that are obtained from the binder experiment results such as penetration index, viscosity-temperature susceptibility, and pen-vis number were calculated. In addition, the temperature range in the rotational viscometer experiment was kept broad, and measurements were made at 10 degrees C increments. By fitting these measurements into the Arrhenius equation, activation energies of original and modified bitumen were obtained. The results revealed that adding nanoclay improved the temperature susceptibility, high-temperature performance, and the resistance properties to aging of the binders.
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    Characterization and rheological behavior of asphalt binder modified by a novel cyclic borate ester additive
    (Elsevier Sci Ltd, 2022) Oruc, Seref; Yilmaz, Bahadir; Sancak, Kemal
    In the current study, the synthesis of a novel additive containing boron and its inclusion in asphalt binder was completely achieved under chemical laboratory conditions. Following this objective, the structural analyses of the additive containing boron, namely Cyclic Borate Ester (CBE), and the modified asphalt binders were examined. The asphalt binders were blended with CBE additive in 1%, 2%, 4%, and 6% (w/w) ratios at each stage of the experiment. The elemental analyses of CBE were performed using the Fourier transform infrared (FTIR) spectroscopy test, the thermogravimetry (TG), and the proton nuclear magnetic resonance (H-1 NMR) spectroscopy test. The mechanisms of the modification in the modified asphalt binders were researched using FTIR while their microstructures and thermal degradation behaviors were analyzed via scanning electron microscopy (SEM) and TG tests. In the analyses the rheological behaviors of the blends were investigated by the temperature-frequency-amplitude sweeps in dynamic shear rheometer (DSR) test. According to the experimental results, it was seen that there was no phase separation between CBE and the asphalt matrix. There was an electrostatic interaction between asphalt and CBE's hydrocarbon chain. Accordingly, it was observed that the rutting resistance and elastic characteristics of the base asphalt binder investigated in the study were increased by including CBE.
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    Cracking, Rutting, and Fatigue Performance of Asphalt Mixtures with a Novel Boron Additive
    (Asce-Amer Soc Civil Engineers, 2025) Yilmaz, Bahadir; Oruc, Seref
    Asphalt binder has a chemically complex structure. Due to this complexity, it is important to enhance the performance properties of asphalt binders by developing new additives that can adapt to their chemical composition. In this context, a new boron-containing additive, cyclic borate ester (CBE), was synthesized in the laboratory. The CBE additive then was incorporated into the asphalt binder at 1%, 2%, 4%, and 6% by weight through mechanical mixing. The asphalt binder with CBE was mixed with aggregate following the Marshall mix design, and briquettes (specimens) were created. For analysis, the Marshall stability and flow tests were conducted on the briquettes, and the Marshall quotient was calculated based on the test results. The indirect tensile test was performed at 5 degrees C, 25 degrees C, and 40 degrees C, with various pulse and rise times. The resilient modulus values of the mixtures were determined using the Asphalt Aggregate Mixture Analyzing System (AAMAS) nomograph. The resilient modulus losses of the mixtures subjected to moisture damage tests also were evaluated using the indirect tensile test. The results showed that the CBE additive improved the stability and strength of the mixtures, reduced the flow values, enhanced low-temperature performance, and increased elasticity, thus minimizing the potential for cracking. Additionally, the additive increased resistance to permanent deformation at moderate and high temperatures, improved load dissipation ability, and enhanced adhesion properties.
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    Effects of Recycled Asphalt Material and Natural Pozzolan as Additives of Hot-Mix Asphalt: A Field Study
    (Springer Int Publ Ag, 2024) Yilmaz, Bahadir; Senturk, Mehmet Akif
    Using existing resources more efficiently and effectively becomes important currently. The question of how to make the best use of resources arises in the choice between constructing new roads and improving deteriorated existing roads. It is also important to reduce the amount of consumption and cost of materials. This has emerged the need to use waste materials by recycling and reusing. In this study, a new hot-mix asphalt (HMA) mixture was developed using recycled asphalt pavement (RAP), which was obtained by excavating the surface of a road at the end of its service life, together with a waste material namely natural pozzolan (NP). The final obtained mixture was used as a wear layer on an active highway. Core specimens were extracted from the paved layer for one year and subjected to dynamic and mechanical laboratory tests. Adding NP improved the resistance of the HMA mixture under heavy seasonal effects and traffic loads. In addition, NP increased the tensile strength, making the HMA mixture more resistant to deformation than control and RAP HMA mixtures. Dynamic creep test results showed that the control asphalt mixture had the most deformation and that the RAP mixture with NP had the least. According to the laboratory results, NP addition increased the stability value of the control mixture by 40%. Especially in cold seasons, the role of NP was more evident. In the performance tests that were applied on core samples taken from the field, ITS values for September increased by 98%, and the deformation values obtained as a result of the dynamic creep test decreased by 12%. In summary, adding NP to RAP HMA improves the performance of the pavement and the cost-effectiveness of the environmentally friendly use of RAP in HMA.
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    Evaluation of performance of asphalt binders containing capric acid based form-stable phase change materials
    (Elsevier Sci Ltd, 2024) Yilmaz, Bahadir; Mert, Hatice Hande; Sesli, Hasan; Ozdemir, Ahmet Muenir; Mert, Mehmet Selcuk
    Phase Change Materials (PCMs) are functional and promising materials due to their tailored properties designed for various applications. Considering the wide range of applications, the use of PCMs with asphalt binders has also attracted attention in recent years. This study focuses on the effect of the adding fatty acid-based shapestabilized composite PCM prepared by solvent-assisted impregnation to asphalt binders. For this purpose, a favorable material, capric acid (CA) was used. In addition, pumice (PUM), a natural and abundant material also known as lightweight aggregate, was preferred as the support material. The features of the prepared composite PCM was named CA-PUM, were examined by conducting the well-known methods, namely Fourier transform infrared (FT -IR) spectroscopy, scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) analyses. The latent heat of melting of CA-PUM was found to be as 46.58 J/g with the incorporation ratio as 34.96 wt%, while the melting peak temperature was determined as 30.93 degrees C. The performance of modified asphalt binders with 0.5%-2.0% (wt/wt) CA-PUM were evaluated by penetration, softening point, rotational viscosity (RV), dynamic shear rheometer (DSR), rolling thin film oven (RTFO) and pressure aging vessel (PAV) tests. Based on the performance test results, the modified asphalt binder included 1.0 wt% CA-PUM demonstrated distinguishable properties in terms of increased resistance to deformations, the highest softening point and viscosity values besides to highest rutting performance.
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    The effect of waste material generated during paper production on the rheological and structural features of asphalt binder
    (Taylor & Francis Ltd, 2023) Yilmaz, Bahadir; Ugurlu, Nuray
    In this study, the performance properties of magnesium lignosulfonate, an organic waste material produced during paper production from wood, on asphalt binder were investigated. The modification was carried out by adding magnesium lignosulfonate (MLS) at 2%, 4%, 6%, and 8% by weight to the asphalt with B50/70 penetration grade. The morphological structure, modification mechanism, and thermal decomposition temperatures of the modified asphalt binders formed by adding the MLS to the asphalt were determined by a Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FT-IR), and Thermogravimetry-Differential Thermal Analysis (TG/DTG), respectively. The physical and rheological properties of the material were determined by penetration, softening point, Rolling Thin Film Oven Test (RTFOT), Dynamic Shear Rheometer (DSR), and Rotational Viscometer (RV) experiments conducted in a laboratory. The experimental results showed that the organic-based waste additive increases the asphalt consistency, rutting, and short-term aging resistance, and decreases the temperature sensitivity.
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    Valorization of biomass-derived magnetic activated carbon from vinasse and grape marc for sustainable bitumen modification
    (Pergamon-Elsevier Science Ltd, 2025) Ozdemir, Ahmet Munir; Yilmaz, Bahadir; Arslanoglu, Hasan
    Agricultural and food-processing residues represent abundant biomass resources with untapped potential for sustainable material production in the bioenergy sector. Functional renewable materials are obtained by using such residues in high-value applications such as bitumen modification. This study investigates the use of magnetic activated carbon (MAC), synthesized from by-products from bioethanol production (vinasse and grape marc) as a sustainable additive for modifying 160/220 penetration-grade bitumen. The objective is to enhance the rheological performance of bitumen under varying thermal and loading conditions. Modified binders containing 5 %, 10 %, and 15 % MAC were evaluated using dynamic mechanical analysis. Master curves for complex modulus and viscosity were developed using the Christensen-Anderson, Cross, and Carreau-Yasuda models. The results show that MAC incorporation improves elasticity, increases zero-shear viscosity, and enhances resistance to permanent deformation. In particular, it was observed that the addition of 15 % MAC increased the ZSV and G*/sin delta (64 degrees C) values by approximately 35 % and 95 % compared to pure binder, respectively. Rheological index (R) values increased by 38 %. The findings suggest that MAC-modified binders offer a promising solution for improving the performance of bituminous pavements in hot climates. Beyond advancing pavement performance, this work demonstrates a high-value utilization pathway for biomass residues, linking waste valorization to renewable material development within the bioenergy framework.