Use of dry mixing method in fly ash based geopolymer as a stabilizer for dredged soil

This study aims to improve the properties of dredged soil obtained from a river in the Philippines. Different percentages of fly-ash based geopolymer, namely 10%, 20%, 30% were used using a dry mixing method to determine the optimum mix. The procedures based on the ASTM standards were conducted to determine the index properties namely Grain Size Distribution Curve (ASTM D422), Specific Gravity (ASTM D854), Atterberg\u27s Limits (D4318), and CBR Test (ASTM D1833) and UCS test (ASTM D2166) of untreated soil. While only the California Bearing Ratio Test and UCS test were conducted on the treated soil. The experimental results showed that the fly-ash based geopolymer improved both the CBR index and the Unconfined Compression Strength of the dredged soil. The optimum mix for the soil-geopolymer mix was 30% because it displayed the largest increase in the CBR index (50.23%) and Unconfined Compressive Strength (912.88 Kpa). © Int. J. of GEOMATE