- 期刊
ENHANCING ASPHALT SUSTAINABILITY: ANTI-AGING PERFORMANCE CHARACTERIZATION OF BIO-ASPHALT USING BLACK LIQUOR LIGNIN MODIFIER
提高瀝青可持續性：使用黑液木質素改質劑來表徵生物瀝青的抗老化性能
摘要
This study evaluates lignin from paper pulp black liquor as an anti-aging modifier for asphalt binder to enhance pavement performance and sustainability. Lignin-modified binders with varying lignin proportions (4%, 8%, and 16% by weight) were subjected to aging simulations using the Rolling Thin Film Oven (RTFO) and UV chamber. The Rheological properties measured by the Dynamic Shear Rheometer (DSR) indicated enhanced stiffness and viscoelastic properties. The chemical characteristics assessed via Fourier Transform Infrared Spectroscopy (FTIR) and Gel Permeation Chromatography (GPC) showed that lignin moderated the increase of carbonyl and sulfoxide groups, suggesting reduced aging. Meanwhile, molecular weight distribution analysis based on GPC results revealed a decreased agglomeration of asphaltene fractions, stabilizing the binder's molecular structure. However, higher lignin contents might reduce fatigue resistance at intermediate temperatures due to increased binder stiffness. Using lignin content to a maximum of 9% improved rutting performance grades from 64°C to 70°C while maintaining adequate fatigue performance. This suggests that a balanced lignin proportion can effectively enhance high-temperature performance and aging resistance without compromising fatigue properties.
並列摘要
本研究評估了紙漿黑液中的木質素作為瀝青黏合劑的抗老化改質劑，以提高路面性能和可持續性。使用滾動薄膜烘箱（RTFO）和紫外線室對具有不同木質素比例（按重量計4%、8%和16%）的木質素改性黏合劑進行老化模擬。動態剪切流變儀（DSR）測量的流變特性顯示剛度和黏彈性特性增強。透過傅立葉變換紅外光譜（FTIR）和凝膠滲透色譜（GPC）評估的化學特性表明，木質素減緩了羰基和亞碸基團的增加，表明老化程度降低。同時，基於GPC結果的分子量分佈分析表明，瀝青質組分的團聚減少，從而穩定了黏合劑的分子結構。然而，較高的木質素含量可能會由於黏合劑硬度增加而降低中間溫度下的抗疲勞性。使用最高9%的木質素含量可將車轍性能等級從64°C提高到70°C，同時保持足夠的疲勞性能。這顯示平衡的木質素比例可以有效增強高溫性能和抗老化性能，而不影響疲勞性能。