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High Permeability

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CJFill-HP (High Permeability) is designed for mass lightweight fills where high permeability is required. It is primarily used to reduce buoyancy of mass fills subject to percolating water or inundation.

Typical CJFill-HP Physical Properties

Wet Cast Density25lb/cuft35lb/cuft
Cured Density16lb/cuft32lb/cuft
Compressive Strength (ASTM C495 @ 28 days)25psi (3.6KSF)200psi (28.8KSF)
Permeability (ASTM D2434 modified)2 cm/sec0.5 cm/sec

Typical Applications

CJFill-HP is provides the lowest unit weights, with bearing capacities and permeabilities exceeding those of soil. For example, 25lb/cuft High Permeability CJFill provides an 3.6KSF unconfined compressive strength, and a dry cured density of less than 20lb/cuft. When replacing soil or stone as backfill material, this can provide load reductions of up to 7 times, while increasing permeability.

Because the material cures into a self-supporting mass, it does not impart lateral loads on structures after it cures. Cure times (to accept foot traffic) are ambient temperature dependent. Typically, foot traffic with nominal prints is possible within six hours. CJFill-HP 30lb/cuft material can accept a 25 ton excavator in fewer than 24 hours.

CJFill-HP Mix Designs

The vast majority of CJFill-HP uses neat mix cement paste. In most markets, this is Type-1L cement. Material generated with Type-1L cement tends to require slightly higher water : cement ratio. Otherwise, there are no impacts on mixes or physical properties. 1L cement is a blend of Portland Cement and up to 15% of limestone. Most 1L cements are around 8% limestone content.

High Permeability CJFill ranges from 25lb/cuft to 35lb/cuft. Density is infinitely variable within that range, and compressive strength increases with density. Wet cast density is programmed into the batch plant onsite, and is controlled by adjusting the ratio of cement paste to foam.

Supplementary Cementitious Materials

Supplementary cementitious materials, such as fly ash and slag, can be integrated into the paste component of Standard CJFill. This is typically only economical in very large placements. This is because slag generally costs the same as Portland Cement. Fly ash, while generally cheaper, is difficult to source in some markets. SCMs also increase the relative alkalis content of paste, which is not problematic from an aggregate compatibility perspective, can cause compatibility problems with the preformed foaming agents used to generate the fill material.

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