Wang Duanyi, Cai Zhiwei, Zhang Zeyu, Xu Xinquan, Yu Huayang
School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510000, China.
Institute of Highway Engineering, RWTH Aachen University, 52074 Aachen, Germany.
Polymers (Basel). 2019 Jul 29;11(8):1253. doi: 10.3390/polym11081253.
Lignocellulosic biomass has gained increasing attention as a performance modifier for bituminous material due to the vast amount available, its low cost and its potential to improve the durability of pavement. However, a comprehensive study concerning both the binder and mixture performance of modified bituminous material with lignocellulose is still limited. This research aims to evaluate the feasibility of applying lignocellulose as bitumen modifier by rheological, chemical and mechanical tests. To this end, two lignocellulosic biomass modified bituminous binders and corresponding mixtures were prepared and tested. The chemical characterization revealed the interaction between lignocellulosic biomass and bitumen fractions. Rheological test results have shown that lignocellulosic modifiers improve the overall performance of bituminous binder at high, intermediate and low temperatures. The findings obtained by mixture mechanical tests were identical to the binder test results, proving the positive effect of lignocellulosic biomass on overall paving performance of bituminous materials. Although lignocellulosic modifier slightly deteriorates the bitumen workability, the modified bitumen still meets the viscosity requirements mentioned in Superpave specification. This paper suggests that lignocellulosic biomass is a promising modifier for bituminous materials with both engineering and economic merits. Future study will focus on field validation and life cycle assessment of bituminous pavement with lignocellulosic biomass.
木质纤维素生物质作为一种沥青材料的性能改性剂，因其储量丰富、成本低廉且具有改善路面耐久性的潜力而受到越来越多的关注。然而，关于木质纤维素改性沥青材料的粘结剂和混合料性能的综合研究仍然有限。本研究旨在通过流变学、化学和力学试验评估应用木质纤维素作为沥青改性剂的可行性。为此，制备并测试了两种木质纤维素生物质改性沥青粘结剂及其相应的混合料。化学表征揭示了木质纤维素生物质与沥青组分之间的相互作用。流变试验结果表明，木质纤维素改性剂在高温、中温和低温下均能改善沥青粘结剂的整体性能。混合料力学试验得到的结果与粘结剂试验结果一致，证明了木质纤维素生物质对沥青材料整体摊铺性能的积极影响。虽然木质纤维素改性剂会使沥青的工作性略有下降，但改性沥青仍满足Superpave规范中提到的粘度要求。本文表明，木质纤维素生物质是一种具有工程和经济优势的沥青材料有前途的改性剂。未来的研究将集中在木质纤维素生物质沥青路面的现场验证和生命周期评估上。
