CJGeo is a factory-trailed installation contractor for Aerix Industries. We focus on geotechnical and utility applications of cellular concrete, such as mass lightweight/load reducing fills, annular space grouting, and pipe abandonment. We work from Maine to Miami to the Mississippi.
Names for Cellular Concrete
Cellular concrete can be called any number of names, many of which vary by region and application. They include:
- Low Density Cellular Concrete (LDCC)
- Lightweight Cellular Concrete (LWCC)
- Low Density Controlled Low Strength Material (LD-CLSM)
- Lightweight Foamed Concrete (LWFC)
- Pervious Cellular Lightweight Concrete (PCLWC)
- Foamed Concrete Fill (FCF)
- Cellular Lightweight Concrete (CLWC)
- Low Density Foamed Concrete (LDFC)
- Lightweight Foam Concrete Fill (LFCF)
- Lightweight Insulating Concrete (LWIC)
- Cellular Grout
- Foamed Concrete
Composition of Cellular Concrete
The vast majority of cellular concrete is a mixture of cement, water and preformed foam. Supplementary cementitious materials such as slag and fly ash may be used, and at high densities, fine aggregate may also be used in mixes.
It’s best to think of cellular concrete as similar to traditional concrete, except that the fine and course aggregate are replaced with preformed foam bubbles. The bubbles prop up the paste while the paste cures, and do not contribute long term to the material in place after set.
Typical Physical Properties of Cellular Concrete
Cellular concrete can be placed at densities as low as 20lb/cuft, and as high as 90lb/cuft. Density and strength are generally positively correlated. 20lb/cuft material breaks around 30psi at 28 days, and 90lb/cuft material will break over 2,000psi at 28 days.
Generation method, the use of SCM, aggregate, w:c ratio and other factors can have significant impacts on the strength of any particular mix. If you have a specific need, please reach out to us to discuss your particular mix design needs. CJGeo can provide design assistance to help determine minimum strength and other physical characteristics, evaluate projects from a constructibility perspective, and help plan for success.
Foaming Agents for Cellular Concrete
As a factory-certified installer for Aerix Industries, CJGeo generates cellular concrete using the following preformed foams:
Historically, foaming agents drove placement designs. However, with synthetic foaming agents and high shear colloidal mixing, historic limits on lift heights, which may have been as thin as 1 foot are not necessary. CJGeo routinely places cellular concrete in lifts up to 20′ thick.
Cellular Concrete’s Value Proposition
It’s significantly easier to move air bubbles than aggregate, so in the utility grouting market, CJGeo’s ability to pump cellular concrete thousands of feet at a time, at very low pressures, significantly reduces time onsite, risks, and costs associated with abandonment and annular space grouting performed using traditional aggregate-based grouts.
Because of its very low unit weights, cellular concrete is an excellent material for mass lightweight fills. As a self-supporting mass once cured, embankments of cellular concrete can stand on their own, reducing, and even eliminating lateral earth pressure on walls. For axial load reduction, cellular concrete can easily save 100lb/cuft of dead load when compared to soil, at least 50lb/cuft of dead load when compared to expanded shale and lightweight aggregate, and is similar in unit weight to foamed glass aggregate, while not requiring any compaction, or massive onsite stockpiles. Unlike Geofoam blocks, cellular concrete will not dissolve if exposed to petroleum products.
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