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Almond and walnut shells as sustainable soil amendments: physical insights for geotechnical applications
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Orientador(es)
Resumo(s)
The use of agricultural waste as soil amendments aligns with global efforts to promote sustainable development and circular economy principles. This study investigates the potential of almond and walnut shells as ecofriendly soil amendments, focusing on their physical and mechanical characteristics, including density, plasticity, compaction, and consolidation behavior. By incorporating these biodegradable by-products into soil systems, the research seeks to evaluate their chemical compatibility with natural soils and their suitability for
enhancing geotechnical performance. Laboratory analyses were conducted to determine the shells' specific gravity, Atterberg limits, Proctor compaction parameters (optimum moisture content and maximum dry density), and oedometric consolidation properties under various stress conditions. Results indicate that almond and walnut shells exhibit very low density, making them suitable for reducing soil weight in specific applications. Additionally, their favorable compaction and plasticity characteristics contribute to improved soil
workability. Consolidation tests reveal that these amendments enhance the compressibility and permeability of treated soils, suggesting potential applications in agricultural and environmental engineering contexts. The findings highlight the dual benefits of reducing agricultural waste disposal and improving soil properties, contributing to the United Nations’ Sustainable Development Goals. By showcasing the viability of almond and walnut shells as sustainable soil amendments, this study provides a novel approach to integrating agricultural by-products into geotechnical engineering practices, supporting both environmental protection and infrastructure resilience.
Descrição
Palavras-chave
Sustainable Development Waste Recycling Circular Economy Geoengineering Environmental Protection Agriculture By-products
Contexto Educativo
Citação
Nouioua, Thamer; Marchiori, Leonardo; silva, Flora; Albuquerque, António; Cavaleiro, Victor (2025). Almond and walnut shells as sustainable soil amendments: physical insights for geotechnical applications. In 7th International Conference WASTES: Solutions, Treatments and Opportunities.
Editora
CVR - Centro para a valorização de Resíduos