Potential of Waste Wood Ash as an Additive in Soil Grouting

The study investigated the use of waste wood ash (WWA) as a cement replacement in low-plasticity clayey soil. Various replacement ratios of WWA were examined (0%, 5%, 10%, 15% and 20%). A binder (cement + WWA) to soil was 0.2 and the water to the binder ratios was 1.4, 1.6 and 1.8 has been conducted. The results indicated a moderate improvement in the unconfined compressive strength (UCS) of the soil up to a replacement ratio of 6%. However, higher replacement ratios resulted in a longer setting time of the binder. The bulk density of the soil decreased with increasing WWA content. Overall, the use of WWA as a cement replacement has the potential to enhance soil strength, but careful consideration of the replacement ratio is necessary to avoid negative effects on strength and setting time. Further research is needed to explore the impact of WWA on other geotechnical properties of the soil for a comprehensive evaluation of its suitability as a soil stabilization technique.