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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.