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AquaBlok - Model 3070FW -For Low Permeability Capping
AquaBlok® is a natural clay-based material that can be placed through a water column to achieve thin, low permeability capping layers (i.e. hydraulic conductivity of 5x10-8 cm/sec or better), while providing a habitat suitable for benthic recovery. It has been used on hundreds of full-scale sites in the U.S. and has been successfully evaluated by the USEPA under it"s Superfund Innovative Technology Evaluation program.
AquaBlok is a patented, composite-aggregate technology resembling small stones that is typically comprised of a dense aggregate core. In this application of the technology, a powdered high-swell sodium bentonite coating is utilized (Figure 1) with varying percentages of additive (bentonite) layer by percent of total weight.
AquaBlok – 3070FW is a freshwater formulation which is 30% Bentonite by weight based on the total quantity of material used in production. This product will provide a low permeability seal in the water without mechanical compaction.
- Aggregate: Nominal AASHTO #8 (1/4-3/8”) or custom-sized to meet project-specific need
- Limestone or non-calcareous substitute, as deemed project-appropriate
- Bentonite: Powdered – Approximate 200 Mesh
- Bentonite Clay; High swell Wyoming Sodium Natural Mineral (Montmorillonite)
- Light Grey Powder; Odorless
- Manufacturers – Product Designation
- Bentonite Performance Minerals – Barakade Standard
- Others that are deemed to meet the manufacturer specification
- Formulations Range from 25 –35% by weight (average)
- Binder: Cellulosic polymer
- Permeability: 1 x 10-7 to 1 x 10-9 cm/sec
- Dry Bulk Density: 75 – 85 lbs/ft3
- Moisture: 10 – 20% (maximum)