Advanced Characterization of Rammed Earth and Hemp Concrete: Towards Hybrid Solution

Abstract

Interest in using earth and bio-based materials for eco-friendly construction is increasing, with rammed earth (RE) and hemp concrete (HC) attracting considerable attention. While RE offers strong structural benefits, its insulation properties, especially in colder weather, are often insufficient. To address this, a hybrid double-layer wall is proposed, using RE as the core load-bearing layer and HC as the external insulation. The low density and porous structure of HC help limit heat transfer, improving energy efficiency. However, to ensure the feasibility and performance of this combination, a detailed assessment of the physical and mechanical properties of each material individually is necessary before their integration. Therefore, this study examines their fundamental characteristics and employs the Digital Image Correlation (DIC) technique to capture full-field displacement and strain, offering detailed insights into the materials behavior. Understanding these aspects will guide the optimized design of the hybrid wall system, ultimately improving the overall performance of rammed earth constructions, while maintaining their environmental and structural advantages.