Evaluation of clay soil stabilization with coffee husk ash for sustainable geotechnical applications
Year: 2025
Type: article
Abstract: ABSTRACT This study evaluates the use of coffee husk ash (CHA) as a stabilizer for improving the physical and mechanical properties of low-plasticity clay soils. CHA was incorporated at 4%, 6%, and 8% by weight. Laboratory tests included compaction, unconfined compressive strength (UCS) under dry and saturated conditions, California Bearing Ratio (CBR), resilient modulus, matrix suction, and soil expansion. Results showed significant improvements: CBR increased by 356%, soil expansion was reduced by 24%, and UCS improved by 17.4% (dry) and 28.0% (saturated) compared to natural soil. Higher ash content led to greater water retention and lower matrix suction, enhancing internal cohesion and stiffness under varying moisture. The resilient modulus also increased with curing time and ash content, reaching up to 25% after 28 days. These findings demonstrate that CHA can significantly enhance both mechanical and hydromechanical behavior of clay soils, making it a suitable alternative for road and infrastructure applications. One challenge addressed in this study is the lack of standardization in the use of agricultural ashes for soil stabilization. Since coffee husk ash is often discarded or underutilized, its application in geotechnical contexts may offer a promising alternative to reduce waste and promote the use of locally available materials.
Source: Matéria (Rio de Janeiro)
Language: English
Subfield: Civil and Structural Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4411735313