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Impact Factor (2025): 6.9
DOI Prefix: 10.47001/IRJIET
Impact Factor (2025): 6.9
DOI Prefix: 10.47001/IRJIET
Vol 10 No 5 (2026): Volume 10, Issue 5, May 2026 | Pages: 587-597
International Research Journal of Innovations in Engineering and Technology
OPEN ACCESS | Research Article | Published Date: 27-05-2026
Expansive soils exhibit significant swelling and shrinkage behavior due to moisture variation, causing serious problems in pavements, foundations, and other civil engineering structures. Stabilization of such soils using sustainable waste materials has gained significance in recent years. In the present study, Coffee Powder (CP) and Fly Ash (FA) were used as eco-friendly stabilizing materials to improve the engineering properties of an expansive soil collected from Gujalamandyam, Tirupati, Andhra Pradesh. Laboratory investigations were carried out using varying percentages of Coffee Powder (2%, 5%, 10%, and 15%) and Fly Ash (5%, 10%, 15%, and 20%). Standard Proctor compaction, Unconfined Compressive Strength (UCS), California Bearing Ratio (CBR), X-Ray Diffraction (XRD), and Energy Dispersive Spectroscopy (EDS) tests were conducted. The results indicated better behaviour with combined mix of (5% CP + 5% FA) exhibiting the highest UCS value of 760.88 kPa at 7 days curing, along with considerable improvement in CBR values. The study demonstrates that Coffee Powder and Fly Ash can be effectively utilized for sustainable expansive soil stabilization.
Expansive Soil; Coffee Powder; Fly Ash; Soil Stabilization; Unconfined Compressive Strength (UCS).
Gokulapati Kanakaraju, Thokalapudi Suresh, & Ch. Sudha Rani. (2026). Stabilization of Expansive Soil by Using with Coffee Powder and Fly Ash. International Research Journal of Innovations in Engineering and Technology - IRJIET, 10(5), 587-597. Article DOI https://doi.org/10.47001/IRJIET/2026.105079
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