Vitale Pierluca, Napolitano Rosanna, Colella Francesco, Menna Costantino, Asprone Domenico
Department of Structures for Engineering and Architecture, University of Naples Federico II-Via Claudio, 21, 80125 Naples, Italy.
Materials (Basel). 2021 Mar 18;14(6):1484. doi: 10.3390/ma14061484.
This study aims to provide a mitigation strategy for reducing the economic and environmental impacts of carbon fiber wastes deriving from automotive industry. Recycling and reuse in the construction industry is proposed, according to an industrial symbiosis within a circular economy perspective. Specifically, the process consists of repurposing carbon fiber reinforced polymer (CFRP) scraps/waste into new cement-matrix composites, for which the resulting benefits, in terms of mechanical and environmental performance, are herein described. An experimental campaign, starting with a specific heat treatment of CFRP sheets and an accurate dimensional distribution analysis of the short carbon fibers, is presented. The influence of the fiber content and length on both the workability and the mechanical performance of cement-based carbon fiber reinforced mortars is also evaluated. A reduced amount of either sand or cement (up to 8% and 12.8% in volume, respectively) is also considered in the mix design of the fiber reinforced mortars and derives from the substitution of the sand or binder with an equivalent volume of CFRP fibers. The results show a satisfactory increase in compressive and flexural strength in the range 10-18% for the samples characterized by a volume fraction of fibers of approximately 4% and having a 2-5 mm length. Finally, a life cycle assessment (LCA, 14040/14044) was carried out to quantify the environmental burden reductions associated with the implementation of the proposed symbiotic scheme.
本研究旨在提供一种缓解策略，以减少汽车行业产生的碳纤维废料对经济和环境的影响。根据循环经济视角下的产业共生理念，提出在建筑行业进行回收和再利用。具体而言，该过程包括将碳纤维增强聚合物（CFRP）废料重新用于制造新的水泥基复合材料，并在此描述其在机械性能和环境性能方面所带来的益处。本文介绍了一项实验活动，该活动始于对CFRP板材进行特定的热处理以及对短碳纤维进行精确的尺寸分布分析。同时还评估了纤维含量和长度对水泥基碳纤维增强砂浆的工作性能和机械性能的影响。在纤维增强砂浆的配合比设计中，还考虑减少砂或水泥的用量（分别减少至体积的8%和12.8%），这是通过用等量体积的CFRP纤维替代砂或胶凝材料实现的。结果表明，对于纤维体积分数约为4%且长度为2 - 5mm的样品，其抗压强度和抗弯强度令人满意地提高了10% - 18%。最后，进行了生命周期评估（LCA，14040/14044），以量化与实施所提出的共生方案相关的环境负担减轻情况。
