Exploring the Integration of Stabilized Earth Concrete in Sustainable Building: A French Case Study

Abstract The integration of stabilized earth concrete in construction presents both benefits and technical challenges. This study analyses its implementation through the case study of the Pierre Fabre Foundation extension, where locally excavated soil was incorporated into the building material. The research explores the aesthetic, ecological, and structural implications of this approach, alongside the logistical and regulatory constraints encountered. Life Cycle Assessment (LCA) results indicate that stabilized earth concrete has a comparable carbon footprint to conventional concrete (167-168 kgCO 2 e/m 3 ), demonstrating its potential as a sustainable alternative. However, the addition of reinforcement steel significantly increases emissions, with standard steel reaching 242 kgCO 2 e/m 3 , and stainless steel increasing this value up to 735 kgCO 2 e/m 3 . Due to the uncertainty regarding galvanized steel’s environmental impact, a wide estimation range was considered. Despite its advantages, the study highlights several barriers to large-scale adoption, including higher shrinkage, increased reinforcement requirements, and corrosion risks due to lower pH levels, necessitating technical adjustments and the use of galvanized steel. Logistical challenges, such as moisture sensitivity and storage constraints, further complicate its implementation. Additionally, the lack of standardized regulations and industry expertise slows its adoption, requiring significant coordination among architects, engineers, and insurers. Through semi-structured interviews with key stakeholders, this research identifies the strategies employed to overcome these challenges and discusses the broader implications for sustainable construction and material circularity. The findings emphasize the need for adapted technical guidelines, enhanced professional training, and regulatory adjustments to facilitate the wider acceptance and integration of stabilized earth concrete in contemporary architecture.