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Biological colonisation in bio-materials and composites with different bio-binder combinations
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Resumo(s)
The increasing demand for sustainable and biodegradable materials in the construction industry highlights the importance of developing circular bio-based building materials that align with the principles of circular bioeconomy. This study forms part of a broader investigation aimed at developing novel construction materials with suitable thermal and acoustic performance. In this context, the present work focuses on evaluating the biological colonisation susceptibility of several natural organic materials in raw form and when used with bio-binder's, with particular attention to their fungal resistance in humid environments. The studied materials are rice husk, rice straw, Posidonia oceanica and sunflower stalk, alone and in combination with three different binders: arabic gum, xanthan gum and sodium alginate. Fungal resistance was tested exposing samples for four weeks under controlled temperature and relative humidity conditions, allowing quantification of mould growth. Results indicate that the tested unbound organic materials are highly susceptible to fungal colonisation. However, fungal proliferation could be significantly reduced by the addition of binders. Among the binders tested, sodium alginate showed the highest effectiveness in limiting fungal growth for all the tested materials, especially when combined with Posidonia oceanica, which presented the lowest bio-colonisation susceptibility. On the other hand, rice husk and sunflower stalk showed the highest fungal susceptibility, even with the application of binders. The results of this work contribute to a better selection of bio-materials and binders in order to enhance durability and sustainability for bio-based construction composites, contributing to the implementation of circular economy strategies in the built environment.
Descrição
Funding Information: This work was partial funded by MICIU/ AEI/10.13039/501100011033 through the project PID2020–117530RB-I00. Also, thanks are due to the Generalitat de Catalunya for the quality accreditation given to the research group GICITED (2021 SGR 01405), the Portuguese Foundation for Science and Technology support through funding UIDB/04625/2025 of the research unit CERIS and the European Union Erasmus+ Programme for the project Bio-Fibre (2022–1-DK01-KA220-HED- 00086641). The first author gratefully acknowledges the financial support of the Spanish Minister scholarship: “Subprograma Estatal de Formación del Programa Estatal para Desarrollar, Atraer y Retener Talento, en el marco del Plan Estatal de Investigación Científica. Publisher Copyright: © 2025 The Authors
Palavras-chave
Bio-based construction products Bio-fibres Biodegradable-binder Biological development Biological susceptibility Building materials Civil and Structural Engineering Building and Construction General Materials Science SDG 8 - Decent Work and Economic Growth SDG 12 - Responsible Consumption and Production