Geo-technical

for extremely demanding geological environments

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Levasil CB is excellent for use underground, especially in environmentally sensitive areas, thanks to its high ground consolidation and water sealing capabilities

Together with a gel-activator, colloidal silica creates an ideal sealing grout that accurately matches the targeted application and desired open time. By adjusting colloidal silica grades and concentrations, the perfect geological structure for consolidation can be achieved.

Rock injection

To achieve extremely watertight tunnel structures, cement grouting alone may not be sufficient. By combining traditional grouting with Levasil CB gel treatment, it is possible to create a durable seal of tunnels in various types of rock.

Construction worker with a laptop standing inside a tunnel. Levasil CB is excellent for use underground – especially in environmentally sensitive areas – thanks to its high ground consolidation and water sealing capabilities.

Soil stabilization

Permeation grouting with Levasil CB gel treatment is used to emplace a low permeability subsurface barrier in sand and silt formations. The low viscosity Levasil CB forms after gelling an impermeable barrier that is biologically and chemically inert, unaffected by filtration, and environmentally safe.

Soil liquefaction prevention

Liquefaction prevention is done by preventing the water from flowing freely in the saturated sand. The low viscosity Levasil CB solution penetrates the soil and replaces the water. Once the gel is formed it prevents the liquefaction from occurring.

The mechanism of gelling

When adding an accelerator (a salt solution) to colloidal silica, a gelling process starts. The formed gel network prohibits liquid transport within the gel volume and is a valuable tool in ground consolidation.

Illustration showing the mechanism of gelling. To the left a container with colloidal silica mixed with the accelerator. After addition of the accelerator, the increased content of ions initiates the gelling process. Approximately 5 to 120 minutes later the silica gel structure is formed. The gel time, from liquid to solid gel can be varied from a few minutes up to several hours.

Featured products

Levasil colloidal silica

Levasil CB25

Levasil CB25 is an alkaline, aqueous dispersion of colloidal silica that is approximately 30% solids by weight. The silica dispersion is sodium stabilized and the amorphous silica particles carry a negative surface charge. The silica particles are discrete, have a slightly rough, spherical shape, and are present in a narrow particle size distribution. The physical appearance of the dispersion is a translucent liquid, slightly more viscous than water. Levasil CB25 is produced for world-wide distribution.

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Levasil colloidal silica

Levasil CB75 LS

Levasil CB75 LS is an alkaline, aqueous dispersion of colloidal silica that is approximately 15% solids by weight. The silica dispersion is sodium stabilized and the amorphous silica particles carry a negative surface charge. The silica particles are structured to enhance the activity of the dispersion. The physical appearance of the dispersion is a clear liquid, slightly more viscous than water. Levasil CB75 LS is produced primarily for world-wide distribution.

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If you have questions about Levasil Colloidal Silica, please contact our technical experts. We look forward to hearing from you.

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