CJFill-UL (Ultra Lightweight) is designed for maximum axial and lateral load reduction, and yield. Of all the CJFill classes, it is by far the most commonly placed.
Typical Physical Properties
| Property | Minimum | Maximum |
| Wet Cast Density | 20lb/cuft | 34lb/cuft |
| Cured Density | 16lb/cuft | 30lb/cuft |
| Compressive Strength (ASTM C495 @ 28 days) | 25psi (3.6KSF) | 200psi (28.8KSF) |
Typical Applications
CJFill-UL is optimized for providing the lowest unit weights but with bearing capacities significantly higher than traditional backfill materials. For example, 25lb/cuft Ultra Lightweight CJFill provides an 8.6KSF 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.
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, but typically foot traffic with nominal prints is possible within six hours. CJFill-UL 30lb/cuft material can accept a 25 ton excavator in fewer than 24 hours. This is very useful in backfilling MSE walls.
CJFill-UL Mix Designs
The vast majority of CJFill-UL is generated using 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, but otherwise there are no impacts on mixes or physical properties. 1L cement is a blend of Portland Cement and up to 15% of limestone, though most 1L cements are around 8% limestone content.
Ultra Lightweight CJFill ranges from 25lb/cuft to 34lb/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 Ultra Lightweight 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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