Akademik Veri Yönetim Sistemi
CONSTRUCTION AND BUILDING MATERIALS, cilt.470, sa.140609, ss.1-15, 2025 (SCI-Expanded)
This study explores the incorporation of cherry and sour cherry-based biochar into bitumen regarding the chemical, microstructural and rheological properties. Biochar was produced from industrial cherry waste (CW) and sour cherry waste (SCW) via slow pyrolysis and introduced to bitumen with 13 %, 15 %, 17 % by weight. Microstructural analysis using SEM indicated a porous, rough surface morphology, with SCW-based biochar displaying a finer particle size than CW-based biochar. Conventional tests showed that biochar addition increased bitumen stiffness in proportion to the biochar ratio. Incorporation of CW and SCW to bitumen resulted with viscosity increase (maximum 2.40 and 2.59 times, respectively) and less sensitivity to temperature variations. Increased penetration index (PI) values from −3.23 to −2.45 suggested a transition from sol to sol-gel behavior. Oscillation tests demonstrated enhanced rutting resistance (1.94- and 1.83-times greater complex modulus, G* at 64ºC for unaged CW and SCW incorporated blends). However, modified blends showed higher susceptibility to elasticity loss following aging. Creep-recovery analysis revealed improved shear resistance with 2.19- and 1.99-times reduced Jnr at 64ºC under 3.2 kPa stress, while approximately 1.15 and 1.06 times decreased elastic recovery (R%) for CW and SCW incorporated blends, respectively. Fatigue properties were enhanced, with higher A and lower B parameters yielding increased number of cycles to failure (Nf), particularly for 1.35 and 1.26 times for CW-and SCW-modified asphalt binders FTIR analysis revealed diminished CH₃ and CH₂ vibrations, along with a decreased presence of hydroxyl groups after pyrolysis.