回收核桃壳作为抗老化剂再用于沥青粘结剂的多角度评价

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-10-10 DOI:10.1016/j.conbuildmat.2025.143969

Abdulgazi Gedik

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引用次数: 0

摘要

沥青老化会降低其抗变形和抗开裂能力，从而破坏路面状况，最终缩短沥青路面的使用寿命。因此，路面科学界一直在通过广泛的生物废物调查来探索替代研究工作，这些生物废物可以作为节省成本、环境可持续和长期有效的抗老化剂。与这些努力相一致，本研究一直致力于仔细研究将回收核桃壳作为沥青粘合剂的抗氧化剂的效果。为此，首先通过超高剪切混合器将核桃壳粉（WSP）以不同的浓度（按重量计为2 %、4 %、6 %和8 %）添加到50/70渗透度的直沥青中。其次，将生物粘合剂和基础沥青进行短期和长期老化。分析了WSP样品的物理、流变学和化学性质的变化，作为对比WSP样品与对照粘结剂老化程度的一种手段。一致性试验结果表明，WSP的加入减轻了时效过程中的硬化效应。与普通粘结剂相比，WSP粘结剂具有更好的抗老化性能，其粘弹性变化较小，氧合产物形成减少，耐热降解能力提高。WSP降低了老化引起的硬化和脆化，显著提高了沥青的抗疲劳性能和低温性能。总的来说，这项研究为WSP在多大程度上减少沥青热氧化老化提供了见解。其中，8 %WSP的延缓衰老效果最好，其衰老指标最低。鉴于WSP的木质纤维素成分和天然抗氧化性能，本研究为提高沥青的抗老化性能提供了新的解决方案。

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Repurposing recycled walnut shell as an anti-aging agent into asphalt binder: A multi aspect evaluation

Bitumen aging undermines road surface conditions by decreasing resistance to deformation and cracking, both of which eventually shorten the service life of asphalt pavements. Accordingly, the pavement scientific community has been exploring alternate research efforts through investigations of a wide range of biowastes that could serve as cost-saving, environmentally sustainable, and long-term effective anti-aging agents. In line with these efforts, the present study has been dedicated to scrutinizing the effects of incorporating recycled walnut shell as an antioxidant for asphalt binder. To this end, walnut shell powder (WSP) was first added to a straight 50/70 penetration bitumen at various concentrations (2 %, 4 %, 6 %, and 8 % by weight) by means of an ultra-high shear mixer. Next, the bio-binders and base bitumen were exposed to short- and long-term aging. The changes in physical, rheological, and chemical properties were analyzed as a means of comparing and contrasting the aging degree of WSP samples with that of the control binder. Consistency test results showed that adding WSP alleviated the hardening effect of the aging process. In contrast to the plain binder, WSP binders had better anti-aging performance as proven by the lower change in viscoelastic behavior, the decline in the formation of oxygenated products, and the improved resistance to thermal degradation. Decreasing the aging-related hardening and embrittlement, WSP significantly enhanced the bitumen’s fatigue resistance and low-temperature performance. Overall, this study provides insights into the extent to which the inclusion of WSP serves to reduce thermal-oxidative bitumen aging. Specifically, 8 %WSP was found to have the best age-retardation effect as evidenced by its lowest aging indices. Given WSP’s lignocellulosic composition and natural anti-oxidant properties, this study offers a new solution for improving the anti-aging performance of bitumen.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.