Effect of Natural Pozzolans Inclusion on CBR Value of Dredged Soil Material

Dredged soil (DS) is commonly considered as environmental waste and has poor geotechnical properties. It is necessary to conduct progressive research for this material which can be utilized. Using natural pozzolans (NP) to improve the geotechnical properties of dredged soil is considered an excellent stage toward sustainable engineering. This research objective assesses the effects of adding natural pozzolan to dredged soil over its CBR value. DS material was taken from sediment deposits in the Bilibili reservoir. According to the USCS classification system, this soil is classified as ML. Visually, this soil is light brown and dominated with fine grain size. The NP stabilizing agent has been dried, crushed, and filtered through a #200 sieve. The proportion of utilized NP was 3, 6, 9, and 12% by dry weight. The California bearing ratio (CBR) test was conducted to measure bearing capability. The CBR was tested in both un-soaked and soaked conditions. The curing time was applied for 7, 14, and 28 days to determine the impact of the additives’ chemical bonding. The results showed that the un-soaked CBR of stabilized DS increased by 2.1–3.2 times, and the soaked CBR of stabilized DS increased by 1.5–3.8 times for all curing periods. Based on these results, the stabilized DS material is suitable for road pavement embankment material.