Investigating the potential of vine pruning chips for non-structural lightweight concrete in the context of sustainable development

This study explores the utilization of grapevine pruning chips as a sustainable aggregate for producing lightweight concrete with thermal insulation properties. The research aligns with the principles of circular economy, sustainable development, and the pursuit of the United Nations' Agenda 2030 goals [1]. Lightweight concrete has gained significant attention in the field of bioconstruction due to its numerous advantages in terms of sustainability, energy efficiency, and environmental impact [2]. Unlike traditional concrete, which is dense and heavy, lightweight concrete incorporates lightweight aggregates that reduce its density while maintaining its structural integrity. The experimental investigation focused on examining the mechanical strength and thermal conductivity of the lightweight concrete made with grapevine pruning chips. The chips were roasted at different temperatures (120, 160, 200 and 240 °C), and the variation of concrete characteristics as a function of the pre-treatment was evaluated. Furthermore, the effect of the wood content on the concrete’s performance was assessed. To evaluate the performance of the lightweight concrete, flexural and compressive strength tests were conducted, providing insights into its structural integrity under different loading conditions. Additionally, thermal conductivity measurements were carried out to assess the material's heat transfer characteristics. The results indicated that the inclusion of vine pruning chips led to a reduction in the overall density of the concrete, resulting in a lightweight material (< 800 kg/m3 ). Furthermore, as the organic material content increased, the concrete exhibited improved thermal insulation properties. The roasting temperature also influenced the final properties of the concrete, with higher temperatures leading to enhanced performance, particularly the compressive strength (from 2MPa of the specimens made with chips roasted at 120 °C to 3.5MPa of the specimens made with chips roasted at 240 °C). By incorporating vine pruning chips into concrete production, this study demonstrates a sustainable approach to waste management while simultaneously contributing to the development of environmentally friendly building materials.