Sustainable repurposing of polyvinyl chloride waste as aggregates in limestone-calcined clay cement

IF 9.7 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Journal of Cleaner Production Pub Date : 2025-02-01 DOI:10.1016/j.jclepro.2025.144862

Yazeed A. Al-Noaimat , Matteo Sambucci , Mehdi Chougan , Eslam El-Seidy , Ilario Biblioteca , Marco Valente , Jacopo Tirillò , Mazen J. Al-Kheetan , Seyed Hamidreza Ghaffar

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引用次数: 0

Abstract

This research addresses the urgent need for sustainable construction practices by presenting an innovative approach to mitigate the environmental burden associated with Polyvinyl Chloride (PVC) waste disposal. This study offers a dual benefit of waste management and resource conservation by repurposing PVC as aggregates in cementitious systems. The study aims to explore the impact of substituting natural aggregates with up to 100 vol% of two types of PVC—soft PVC from electric wire coverings and hard PVC from water pipes—on the fresh properties, mechanical strength, physical performance and environmental impact of the limestone-calcined clay cement (LC3) system. Incorporating both hard and soft PVC reduced the flowability significantly. In addition, flexural and compressive strength of LC3 mortars declined by around 52% and 48% for H-PVC, and by around 64% and 87% for S-PVC mixes, respectively. However, completely substituting natural aggregates with PVC enhanced thermal insulation by up to 60% compared to control samples. The thermal conductivity of LC3 containing 100 S-PVC achieves the requirements of RILEM to be considered as an insulating lightweight cementitious material. PVC incorporation exhibited mixed effects on sound insulation. On the other hand, the total absorbed energy increased significantly by 290% and 305% for 100% hard (HPVC) and 100% soft (SPVC) samples, respectively, compared to the control sample. Conversely, the peak impact force slightly decreased for LC3 with HPVC, while LC3 with 100% SPVC showed a reduction of about 53%. The use of PVC aggregates remarkably diminished the carbon footprint of the selected mix designs, suggesting that recycling PVC into aggregate for cementitious materials offers a sustainable solution for both load-bearing (HPVC) and non-load-bearing (SPVC) applications.

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聚氯乙烯废物作为石灰石-煅烧粘土水泥集料的可持续再利用

本研究通过提出一种创新的方法来减轻与聚氯乙烯（PVC）废物处理相关的环境负担，解决了可持续建筑实践的迫切需要。本研究提供了废物管理和资源保护的双重效益，通过在胶凝系统中重新利用聚氯乙烯集料。该研究旨在探索用两种类型的PVC（来自电线覆盖层的软PVC和来自水管的硬PVC）替代天然骨料对石灰石-煅烧粘土水泥（LC3）系统的新鲜性能、机械强度、物理性能和环境影响的影响。结合硬和软PVC显著降低流动性。此外，H-PVC混合料的LC3砂浆抗折和抗压强度分别下降约52%和48%，S-PVC混合料的抗折和抗压强度分别下降约64%和87%。然而，与对照样品相比，用PVC完全替代天然骨料可提高高达60%的隔热性能。含有100 S-PVC的LC3的导热系数达到RILEM的要求，可以考虑作为一种绝缘轻质胶凝材料。PVC掺入对隔音效果的影响好坏参半。另一方面，与对照样品相比，100%硬质（HPVC）和100%软质（SPVC）样品的总吸收能量分别显著增加了290%和305%。相反，添加HPVC的LC3的峰值冲击力略有下降，而添加100% SPVC的LC3的峰值冲击力下降约53%。PVC骨料的使用显著减少了所选混合设计的碳足迹，这表明将PVC回收成骨料用于胶凝材料为承重（HPVC）和非承重（SPVC）应用提供了可持续的解决方案。

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来源期刊

Journal of Cleaner Production 环境科学-工程：环境

CiteScore

20.40

自引率

9.00%

发文量

4720

审稿时长

111 days

期刊介绍： The Journal of Cleaner Production is an international, transdisciplinary journal that addresses and discusses theoretical and practical Cleaner Production, Environmental, and Sustainability issues. It aims to help societies become more sustainable by focusing on the concept of 'Cleaner Production', which aims at preventing waste production and increasing efficiencies in energy, water, resources, and human capital use. The journal serves as a platform for corporations, governments, education institutions, regions, and societies to engage in discussions and research related to Cleaner Production, environmental, and sustainability practices.