By Hope Barbra
Brazil is setting a precedent by using and turning sugarcane waste into durable, eco-friendly roads — and the results are impressive.
As one of the world’s largest sugarcane producers, Brazil has found an innovative way to manage sugarcane bagasse (the fibrous residue left after juice extraction). Instead of dumping it, researchers are mixing its ash into asphalt.
This new technology — a waste-turned-wonder — not only reduces landfill use but also increases road strength, cuts maintenance costs, and extends road life, all while reducing the carbon footprint of construction.
Lab tests have shown improved durability, rut resistance, and flexibility under heat and traffic. There is also no need for virgin materials like traditional mineral fillers, which lowers extraction and transport impacts.
This supports circular economy goals by giving new life to biomass byproducts.
In Kenya, the main sugar factories are in the Western and Coastal regions. If the country adopts this new technology, it could help ensure that roads in these areas are tarmacked more sustainably.
Engineer Benedict Omollo, in a post on WhatsApp’s “Lakeland Development” group, said the technology is achievable.
Omollo outlined the key steps as follows:
- Soil Preparation: Collect and prepare the subgrade soil by removing vegetation, debris, and other organic matter.
- SBA and Lime/Cement Mixing: Mix Sugarcane Bagasse Ash (SBA) with lime or cement in varying proportions, typically 2.5% SBA with 5% lime, to achieve the desired stabilization effect.
- Compaction: Compact the treated soil mixture to achieve maximum dry density and optimal moisture content.
- Curing: Allow the compacted mixture to cure, enabling chemical reactions between SBA, lime/cement, and soil particles to take place.
Benefits:
- Improved Soil Strength: The SBA and lime/cement mixture increases the soil’s bearing capacity and reduces its plasticity.
- Increased Durability: The stabilized subgrade layer can withstand heavy traffic loads and moisture changes.
- Cost-Effective: Using SBA as a stabilizer can reduce construction costs and provide a sustainable alternative to traditional materials.
- Environmental Benefits: Utilizing SBA reduces waste and promotes sustainable construction practices.
Challenges and Future Directions:
- Further Research: Additional studies are needed to optimize SBA and lime/cement mixtures for specific soil types and environmental conditions.
- Field Implementation: Large-scale field trials are necessary to validate the effectiveness of SBA stabilization in real-world applications.
