Analysis of the mechanical properties of an earth composite reinforced with natural stabilizers and fique fibres
Document Type
Article
Publication Title
Journal of Building Engineering
Abstract
Vernacular architecture has provided valuable insights into how the building design of the future should be conceived, in an era that demands a balanced relationship between human activity and the environment. Earth, a material historically used worldwide for its accessibility, low cost, and versatility, stands out as a key component in this transition. The aim of this work is to experimentally demonstrate the potential of biodegradable earthen composites reinforced with natural stabilisers and fique fibres, as a sustainable alternative to conventional cement-based materials. A series of five mixtures were tested, combining an earth matrix (sand + clay) with stabilisers (tannins, gypsum, and volcanic ash) and natural fibres of fique (Furcraea andina). The mechanical characterisation included unconfined compressive strength (UCS) and flexural strength tests on prismatic specimens (160 × 40 × 40 mm). Results show that the addition of fibres significantly improved ductility, while the inclusion of stabilisers enhanced compressive behaviour. The highest UCS value (2.85 MPa) was obtained in samples stabilised with volcanic ash and fique, representing an increase of 38 % compared to unstabilized earth composites. The flexural strength reached 0.65 MPa, doubling the value of the reference mixture without additives. These results confirm that natural tannin-based and pozzolanic stabilisers can effectively replace cement in earthen materials while maintaining biodegradability and low embodied energy. The proposed composite demonstrates high mechanical stability, low environmental impact, and complete reintegration into natural cycles, offering a feasible model for low-carbon construction and material circularity in future urban development.
DOI
10.1016/j.jobe.2025.114432
Publication Date
11-2025
Language
eng
Recommended Citation
Pulido-Cavada, A. M., de Isidro Gordejuela, F., Sancho Alambillaga, R., González Lezcano, R.A.. (2025). Analysis of the mechanical properties of an earth composite reinforced with natural stabilizers and fique fibres. Journal of Building Engineering, 114,. https://doi.org/10.1016/j.jobe.2025.114432 ]