Compressed earth blocks for sustainable construction in Benin

Mathieu Audren, a researcher at the National Polytechnic Institute of Brittany, has developed compressed earth blocks, reducing the use of non-renewable aggregates in construction by 340%. This innovation, presented in 2024, meets the growing demand for housing while minimizing environmental impact in Benin.

Mathieu Audren's thesis addresses a fundamental issue for the construction sector: meeting the growing demand for housing while minimizing environmental impact. In a context where urban populations are increasing, the industrialization of compressed earth block production from quarry by-products is essential to diversify materials and reduce dependence on non-renewable aggregates.

Audren has optimized the formulation of the blocks and adapted the vibro-compaction process. His geotechnical tests show that recycled materials can achieve satisfactory mechanical properties. For example, case studies in West Africa reveal that blocks made from raw earth and quarry by-products can offer strength comparable to that of traditional materials, thus facilitating their adoption.

The industrialization of compressed earth blocks represents a strategic opportunity for the sustainable construction sector. Decision-makers should consider pilot projects to demonstrate the effectiveness of these materials. By integrating these solutions, the market for sustainable building materials could meet a growing demand while providing an attractive return on investment.

« « Our studies show that the use of raw earth combined with quarry by-products can produce blocks with strength comparable to that of traditional materials, » says Mathieu Audren. »

« « Innovation in building materials is crucial for decision-makers looking to promote sustainable and accessible solutions, » emphasizes the Lektaris team. »