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This document summarizes a study that investigated the strength and microstructure properties of spent coffee grounds stabilized with rice husk ash and slag geopolymers to produce a sustainable subgrade material for construction. The study found that an optimum mix of 70% spent coffee grounds, 20% rice husk ash, and 10% slag cured at 50°C achieved an unconfined compressive strength of 2 MPa after 90 days of curing. Observing the strength development over 90 days showed that elevated curing temperatures were

Author

karskot

Language

EN