A groundbreaking study published in ‘Applied Sciences’ explores the potential of self-compacting lightweight concrete (SCLC) using unconventional aggregates derived from sugarcane bagasse ash (SBA) and scheelite mining residue (SMR). Conducted by a team led by Jemima Tabita F. de Sousa from the Department of Civil Engineering at the Federal University of Rio Grande do Norte, this research not only addresses the pressing need for sustainable construction materials but also promises significant commercial impacts for the construction sector.
Self-compacting concrete is already recognized for its exceptional workability and ability to fill molds without vibration, making it ideal for complex structures. By integrating lightweight aggregates, the new SCLC offers additional benefits, including reduced density, which lowers transportation costs and enhances seismic performance. This innovation is particularly crucial in Brazil, where the production of lightweight aggregates is largely confined to one manufacturer in São Paulo, limiting accessibility for regions like the North and Northeast.
“The use of SBA and SMR not only provides a sustainable alternative to traditional aggregates but also promotes the effective reuse of industrial byproducts,” says de Sousa. This is particularly relevant as Brazil’s sugarcane industry generates vast quantities of SBA, with the recent harvest yielding over 615 million tons. Meanwhile, the mining of scheelite results in significant waste, with local mining operations amassing approximately 10 million tons.
The research team conducted extensive tests to assess the performance of SCLC made with these unconventional aggregates, comparing them to the commercially available expanded clay aggregates. The results were promising, showing that while the commercial aggregates performed slightly better, the SCLC using SBA and SMR still met the standards for structural lightweight concrete. Notably, the SCLC-SMR37 achieved impressive compressive strength values, demonstrating the potential for these materials in real-world applications.
De Sousa highlights the broader implications of this research: “By utilizing local resources, we can reduce logistics costs and CO2 emissions associated with transporting materials over long distances. This not only supports the environment but also fosters economic growth in less industrialized regions.”
As the construction industry increasingly prioritizes sustainability, the findings from this study could pave the way for the adoption of more eco-friendly practices. The use of SBA and SMR as lightweight aggregates can significantly reduce the carbon footprint of concrete production while simultaneously addressing the issue of waste management in Brazil.
With the potential to reshape the landscape of construction materials, this research underscores the importance of innovation in the quest for sustainability. It invites industry stakeholders to rethink their material choices and consider the benefits of integrating locally sourced, recycled materials into their projects. For more information on this pioneering research, you can visit the Department of Civil Engineering at UFRN.