Wang Bo, Shen Junan, Li Shuang, Wang Wei
Zhongyifeng Construction Group Co., Ltd., Suzhou 215131, China.
Jiangsu Technology Industrialization and Research Center of Ecological Road Engineering, Suzhou University of Science and Technology, Suzhou 215011, China.
Materials (Basel). 2023 Oct 10;16(20):6618. doi: 10.3390/ma16206618.
This paper investigated, for the first time, the feasibility of using peanut shell powder, a plant waste residue, as a modifier for asphalt, particularly its self-healing ability. Modified asphalt samples were prepared using varying particle size ranges and concentrations of peanut shell powder. Various tests, including fatigue-healing-fatigue tests, high- and low-temperature rheological property tests, penetration tests for conventional performance, and atomic force microscopy scans, were conducted to investigate the effects of peanut shell powder on the self-healing performance and other properties of asphalt. The results showed that the porous structure of peanut shell powder was able to absorb light components within the asphalt and release them under load, thus improving the self-healing and fatigue resistance properties of the modified asphalt. Experimental conditions such as temperature, healing time, and fatigue damage level also influenced the self-healing performance of asphalt. Additionally, peanut shell powder could increase the dynamic viscosity and high-temperature rheological property of modified asphalt while reducing its temperature susceptibility. However, it had a negative impact on the low-temperature ductility and creep rate, which could potentially lead to premature cracking of asphalt pavement in colder regions. Increasing the content of peanut shell powder and reducing its particle size within a certain range had positive effects. When the content of peanut shell powder was 4% and the particle size range was 80-100 mesh, the overall performance of modified asphalt was satisfactory.
本文首次研究了将植物废渣花生壳粉用作沥青改性剂的可行性，尤其是其自愈合能力。使用不同粒径范围和浓度的花生壳粉制备了改性沥青样品。进行了各种试验，包括疲劳-愈合-疲劳试验、高低温流变性能试验、常规性能针入度试验以及原子力显微镜扫描，以研究花生壳粉对沥青自愈合性能和其他性能的影响。结果表明，花生壳粉的多孔结构能够吸收沥青中的轻质成分并在荷载作用下释放它们，从而改善改性沥青的自愈合和抗疲劳性能。温度、愈合时间和疲劳损伤程度等试验条件也会影响沥青的自愈合性能。此外，花生壳粉可提高改性沥青的动态粘度和高温流变性能，同时降低其温度敏感性。然而，它对低温延性和蠕变速率有负面影响，这可能会导致寒冷地区沥青路面过早开裂。在一定范围内增加花生壳粉含量并减小其粒径具有积极作用。当花生壳粉含量为4%且粒径范围为80-100目时，改性沥青的综合性能令人满意。
