In the sun-scorched expanse of Lake Chad, a humble soil known as diatomaceous earth has long been an untapped resource for construction. However, its unique characteristics have posed challenges for builders. Now, a groundbreaking study led by Bruno Bassa from Moundou University in Chad is turning the tables, demonstrating how a simple addition of lime can transform this readily available material into a high-quality construction resource.
Bassa and his team have uncovered that by adding just a small amount of lime to diatomaceous earth, they can significantly enhance its mechanical and thermal properties. “The addition of lime allows for the production of quality Stabilized Compressed Earth Blocks (SCEBs) for construction,” Bassa explains. This finding is a game-changer for the region, where traditional building materials are often scarce or expensive to import.
The study, published in the Journal of Materials and Engineering Structures (or “Journal of Materials and Civil Engineering Structures” in English), reveals that the compressive strength of SCEBs increases with the addition of lime. While blocks without lime show a strength of 2 MPa after 30 days of curing, those with 10% lime exhibit a remarkable compressive strength of 4.27 MPa. This meets several international standards for Compressed Earth Blocks, making them suitable for a wide range of construction projects.
But the benefits don’t stop at strength. The research also highlights improved thermal properties. “Thermal conductivity decreases with the addition of lime,” Bassa notes, “and remains widely above 0.065 W/m.°K, which is a good value for thermal insulation.” This means that buildings constructed with these enhanced SCEBs could be more energy-efficient, reducing the need for artificial cooling and heating.
The implications for the energy sector are significant. As the world grapples with climate change and the need for sustainable building practices, this research offers a promising solution. By utilizing locally available materials and simple, cost-effective treatments, builders can create high-performance structures that are both environmentally friendly and economically viable.
“This research could shape future developments in the field by promoting the use of local, sustainable materials in construction,” Bassa says. “It’s not just about building stronger structures; it’s about building them smarter and more responsibly.”
As the construction industry continues to evolve, the insights from this study could pave the way for innovative building practices that prioritize sustainability and efficiency. For the energy sector, this means a potential reduction in energy consumption and a step towards a more sustainable future.