CJFill-ST (Standard) is designed for grouting applications which require higher strengths or densities. It is most commonly used in the utility grouting market deep underground where loads are higher.
Typical CJFill-ST Physical Properties
| Property | Minimum | Maximum |
| Wet Cast Density | 35lb/cuft | 70lb/cuft |
| Cured Density | 32lb/cuft | 65lb/cuft |
| Compressive Strength (ASTM C495 @ 28 days) | 200psi (28.8KSF) | 1500psi (216KSF) |
Typical Applications
CJFill-ST is optimized for providing the lowest unit weights but with bearing capacities significantly higher than traditional backfill materials. For example, 45lb/cuft Ultra Lightweight CJFill provides an 57KSF unconfined compressive strength, and a dry cured density of less than 40lb/cuft. When replacing soil or stone as backfill material, this can provide load reductions of up to three times.
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.
The most common use of CJFill-ST is in deep utility applications, such as annular space grouting and pipe abandonment under significant cover. This adit fill project just outside of Washington, DC is a great example of this type of application. Deep cover of potentially unstable rock called for a higher compressive strength than usual to ensure stability of both a new tunnel and existing metro station gallery.
CJFill-ST Mix Designs
The vast majority of CJFill-ST 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. However, most 1L cements are around 8% limestone content.
Standard CJFill ranges from 35lb/cuft to 70lb/cuft. Density is infinitely variable within that range, and compressive strength increases with density. Wet cast density is set in the field, 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 because slag generally costs the same as Portland Cement, and 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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