A sustainable solution of coffee husk waste disposal for soil stabilization

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Sustainable engineering conserves energy and resources for future generations. Natural resources have deteriorated because of the rapid increase in global population. Similarly, the waste amount released parallels population growth. The waste that does not decompose will be buried for hundreds of years, causing harm to the environment, and contributing to the environmental and financial challenge of waste disposal. Introducing more eco-friendly materials is of essential relevance in geotechnical engineering. Coffee is among the most highly valued commodities today. Its production has increased drastically in recent years, but so have its waste by-products. Unfortunately, handling coffee husk waste has become a major issue due to increased coffee production and consumption. This study examines the influence of coffee husk ash (CHA) on the mechanical and compressibility properties of stabilized clayey soil. Five different samples of soil were made, containing 5, 10, 15, 20, and 25% of CHA. The physical and mechanical properties of the CHA-clay will be described in detail in the paper. The presence of CHA in clayey soil improved both the Atterberg limits and the compaction properties. In addition, it was found that the unconfined compressive strength (UCS) and California bearing ratio (CBR) values of CHA-modified soil showed better performance than untreated soil. The potential of replacing conventional resources with waste products such as CHA offers significant technical, financial, and environmental benefits in the current context of sustainability, especially in the road construction industry.

9th International Congress on Environmental Geotechnics (ICEG2023)

Stabilization