Yazar "Yilmaz, Mehmet" seçeneğine göre listele

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    Automatic Segmentation of Asphalt Cracks on Highways After Large-Scale and Severe Earthquakes Using Deep Learning-Based Approaches
    (Ieee-Inst Electrical Electronics Engineers Inc, 2025) Yilmaz, Mehmet; Yalcin, Erkut; Demir, Fatih; Ozdemir, Ahmet Munir; Atar, Muhammed; Gunes, Aysegul; Cambay, Ertugrul
    This study develops a deep learning-based automated system for detecting and segmenting earthquake-induced asphalt cracks, offering a rapid and reliable solution for post-disaster road condition assessments. Unlike traditional manual inspections, which are time-consuming and error-prone, our approach leverages advanced segmentation techniques to ensure accurate, pixel-level classification of various crack types. The main challenge of this study was determining the damage caused to highways by earthquakes with magnitudes greater than 7.0, which occur approximately once every 200 years. The most crucial step in the automatic detection of these damages is the reliable preparation of a high-accuracy dataset. To achieve this, pixel-based labels were created by experts in the construction field by analyzing each pixel value. Following two major earthquakes, a unique dataset for segmenting roadway deterioration was created through intensive and detailed studies. This study aims to present the performance results of popular deep learning-based segmentation models in an unbiased manner, providing a feasible infrastructure for future real-time applications. The innovative aspect of this research lies in the creation of a unique post-earthquake dataset, collected and labeled from highways affected by the February 6, 2023 earthquakes in Turkey (Mw = 7.7 and Mw = 7.6). Deep learning models, including SegNet, Attention SegNet, U-Net, FCN (8s), and DeepLab, were trained and tested on this dataset. Among these, the SegNet model achieved the best performance with an average accuracy of 86.72%, precision of 92.99%, and sensitivity of 78.45%. By demonstrating superior performance metrics compared to existing methods, this study provides a robust framework for future infrastructure monitoring and maintenance strategies, ensuring safer and more resilient transportation networks in disaster-prone regions.
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    Combining polymers and additives for sustainable asphalt binder performance
    (Elsevier, 2025) Aydin, Hakan; Yalcin, Erkut; Yilmaz, Mehmet; Ozdemir, Ahmet Munir; Alatas, Taner
    The viscoelastic and thermoplastic nature of bituminous materials makes them highly sensitive to factors such as temperature changes, extreme and repeated loading, and UV radiation. To prevent this sensitivity from causing significant structural problems, bitumen must exhibit behavior characterized by desirable properties. The most common method to achieve this is through polymer modification. To date, a wide variety of polymers have been used for bitumen modification, and recent research has increasingly focused on using different polymers together. In this study, 611 elastomer, crumb rubber (CR), and melastol-crumb rubber (MCR) were used both individually and in combination as modifiers. Their physical, rheological, and mechanistic behaviors were thoroughly investigated. The findings indicate that binders modified with 611 and MCR exhibited superior rheological properties, including increased stiffness, elasticity, and resistance to permanent deformation when compared to those modified with SBS and CR. The best performance was obtained from the binder containing 3.5 % 611 additive. It improved the high temperature performance of the pure binders. The findings also highlight the sustainability potential of this approach, since the incorporation of recycled melastol crumb rubber (MCR) reduces waste and the required dosage of virgin elastomer, thereby supporting environmentally and economically sustainable pavement practices. Future research should emphasize field trials and long-term performance evaluations to validate these laboratory findings.
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    Dynamic-Mechanic Analysis and Rheological Modelling of Waste Face Mask Modified Bitumen
    (Turkish Chamber Civil Engineers, 2024) Ozdemir, Ahmet Munir; Yalcin, Erkut; Yilmaz, Mehmet; Kok, Baha Vural
    Due to the Covid-19 global pandemic, the use of face masks has increased considerably in recent years. Used face masks are released into our environment and become a severe environmental threat. Therefore, researchers have focused on the recycling of waste face masks. Recently, studies have been carried out on the use of waste face masks as additives in bituminous materials, but a detailed rheological characterization has not been made. In this study, modified bitumens were obtained by adding 1%, 1.5%, 2%, 2.5%, and 3% waste face mask (WFM). Subsequently, frequency sweep test was performed on modified bitumen samples through a Dynamic Shear Rheometer (DSR). Thus, the viscoelastic behavior of WFM modified bitumen was investigated at different temperatures and loading rates. Performance analysis was conducted with rheological master curves, which were characterized according to analytical and mechanistic models. In this study, rheological evaluations were performed according to the Christensen-Anderson (CA) Model, Christensen-Anderson-Marasteanu (CAM) Model, Sigmoidal Model (SM), and finally, the mechanistic Huet-Sayegh Model (HSM). According to the results, it was determined that WFM significantly increased the rutting resistance of bitumen and performed better at low and high loading rates than the pure bitumen at each WFM ratio.
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    Effect of polymer modification on bitumen rheology: A comparative study of bitumens obtained from different sources
    (De Gruyter Poland Sp Z O O, 2025) Ozdemir, Ahmet Munir; Yalcin, Beyza Furtana; Yilmaz, Mehmet
    The rheological and mechanical properties of bituminous binders vary significantly depending on the crude oil source. Consequently, the response of binders from different sources to polymer modification also differs. This study compares the rheological performance of B160/220 penetration-grade binders sourced from the Turkey-Batman and Iraq-Lanaz refineries, modified with styrene-butadiene-styrene (SBS), the most widely used polymer additive. To evaluate high-temperature performance, performance grade and frequency sweep tests were conducted using a dynamic shear rheometer. In addition to experimental assessments, the rheological behavior of the binders was analyzed using the Christensen-Anderson, Cross, and Carreau-Yasuda models. Time-temperature superposition principle master curves were generated to characterize their viscoelastic behavior. Zero shear viscosity (ZSV) values were determined using the Cross and Carreau-Yasuda models to examine the impact of polymer modification on binder viscosity. The findings indicate that the initial rheological properties of bitumen significantly influence its response to SBS modification. For instance, the G*/sin delta value increased by up to 199% at 64 degrees C with 4% SBS addition, while the softening point rose by 9.5 degrees C compared to unmodified binders. Modelled ZSV values showed more than a sevenfold increase in some cases, especially in Iraqi binders. On the other hand, at -18 degrees C, the m-value dropped to 0.282 in the B-SBS4 binder, indicating a potential risk of low-temperature cracking. While polymer modification improved the rheological properties of both bitumen types, its effectiveness varied depending on the source.
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    INVESTIGATION OF THE EFFECT OF CARBONATION CAKE ON RHEOLOGICAL PROPERTIES OF BITUMINOUS BINDERS
    (Necip Fazıl YILMAZ, 2021) Özdemir, Ahmet Münir; Yalçın, Erkut; Arslanoğlu, Hasan; Yilmaz, Mehmet; Kök, Baha
    Aggregates and bitumen used in road flexible pavements are non-renewable natural materials and in terms of sustainability, it is of great importance that the service life of road pavements is long. Waste materials are also rising with increasing products due to industrial development. The evaluation of waste materials both prevents the destruction of nature by reducing the use of very limited natural materials and reduces the environmental problems in case of storage of waste materials. In this study, carbonation cake, which is a waste of sugar factory, was added to bitumen. Penetration, softening point, rotational viscosity and dynamic shear rheometer tests were applied on pure and modified bitumen. According to the results, it was determined that carbonation cake had no positive or negative effect on medium and high temperature rheological properties of bitumen. From the experiments, promising results have been obtained for the disposal of waste carbonation cake in a different area.
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    Self-Healing and Mechanical Properties of Aged Hot Mix Asphalt Containing Waste Oil Capsules
    (Springer Heidelberg, 2025) Erdogan Yamac, Ozge; Yilmaz, Mehmet; Yalcin, Erkut; Ozdemir, Ahmet Munir; Garcia-Hernandez, Alvaro; Kok, Baha Vural
    Hot mix asphalts are known to have a self-healing property and microcracks in the pavement can close to some extent after they occur if they are not subjected to load and if sufficient time is allowed. However, this healing period is prolonged, and the healing rate is not very high. In this study, calcium alginate capsules containing waste vegetable oil and waste mineral oil as rejuvenating agents were produced, and used in asphalt mixtures at four different rates (0.25%, 0.50%, 0.75%, and 1.0%) by weight. The study aims to develop an environmentally friendly and economically viable repair method by using waste oils. Marshall stability and flow and tensile strength ratio tests were conducted on cylindrical specimens. Additionally, three-point bending test was performed on aged asphalt mixtures to determine the self-healing rates of cracks formed in the specimens. Fourier transform infrared spectroscopy was conducted on bitumen specimens taken before crack formation and after the healing period to determine the percentage of ruptured capsules in the mixture. The results showed that the addition of capsules containing waste mineral oil and vegetable oil reduced stability values and increased flow values. However, according to the results of the retained Marshall stability test, it was determined that the addition of capsules, especially at a 0.5% ratio, increased resistance to moisture damage. Regarding crack-healing results, it was found that temperature and curing time increased healing rates, and capsules containing waste mineral oil provided higher healing rates compared to those containing waste vegetable oil.