Investigating the Suitability of Bentonite Sludge from Deep Foundation Construction for Landfill Applications
Investigating the Suitability of Bentonite Sludge from Deep Foundation Construction for Landfill Applications
Investigating the Suitability of Bentonite Sludge from Deep Foundation Construction for Landfill Applications
Abstract and Figures
In Bangkok, Thailand, deep foundation and diaphragm wall construction has been prevalent for over 50 years due to thick, soft clay layers requiring stabilization for building foundations and basements. Bentonite slurry, used for borehole and trench stabilization, becomes a waste product, posing environmental and logistical challenges. This study explores the feasibility of using flocculated bentonite sludge, derived from deep foundation construction and treated with anionic polyacrylamide, as a sustainable material for landfill construction. The physicochemical, swelling, and hydraulic properties of the bentonite sludge were investigated and compared to the original bentonite powder. Test results show that bentonite sludge exhibits lower swelling and barrier properties than the original specimens, primarily due to the anionic polyacrylamide modifying the microstructure of bentonite particles. Although the bentonite sludge does not possess optimal swelling properties for meeting the requirements of core material in geosynthetic clay liners, it can still be utilized as a lining material with proper design and construction based on compaction and permeability tests reported in this study. This research highlights a promising approach to employing bentonite sludge in landfill applications, providing a potential solution for waste management and sustainable development in the region.
