RECYCLING JET GROUT BACKFLOW: WASTE MITIGATION AND COST BENEFITS

摘要

Jet grouting is a method of ground improvement that relies on the erosive capacity of high-speed jets to cutrnand mix the ground in place with a cementitious grout. A continuous return flow of cuttings, called jet groutrnbackflow or spoils, is expelled to the surface during the grouting process. Data from projects completed inrnToronto and Ottawa is presented where BOS Solutions’ services provided significant savings compared tornthe traditional spoils treatment utilizing vacuum trucks for spoils disposal. These traditional treatmentrnmethods are cumbersome and expensive by nature. BOS Solutions provided an alternative solution that isrnenvironmentally friendly and capable of handling full flow to process these jet grout spoils utilizing a tankrnsystem paired with centrifuges and flocculation additives to remove the ground soils and grout product fromrnthe spoils slurry. BOS’ process produced a clean water for reuse in the project while reducing the overallrnwaste volume by producing a dry, stackable solid that could be hauled to a landfill. Benefits observed byrnusing the BOS process were disposal waste volumes decreased over 30% and at least a 19% reduction onrndisposal costs.