Soil has an important role in the construction of buildings and roads. Overall, the pavement must be strong enough to carry the weight of the vehicle on it. The strength of the road pavement depends on the bearing capacity of the subgrade. One of the efforts to increase the bearing capacity of the subgrade is to stabilize the original soil with bamboo leaf ash from burning residue. In this study, bamboo leaf ash was used to increase the bearing capacity of the soil. Bamboo trees have a high

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... th rate in Indonesia, one of which is in the Banten area, so that the waste from bamboo trees is feasible to be used as an eco-friendly additives. Variations of bamboo leaf ash used were 5%, 10%, and 15% of dry soil weight with curing time of 0 days, 3 days, and 7 days. The tests carried out in this study was the CBR test without immersion, testing the physical properties of the soil and soil classification based on USCS. The results showed that the addition of bamboo leaf ash to the soil decreased the plastic index value from 20.11% to 15.96% and could increase the CBR value from 3.4% to 13.31% at the optimum percentage of variations in ash from burning bamboo leaves. % and curing time is 7 days.