MOORE & TABER                     

 

 

Soil Grouting and Ground Improvement Specialists

 

         

Subsealing is a process whereby fluid grout is injected beneath concrete slab and foundation elements (or behind wall elements) to fill voids, providing positive contact with subgrade soils.  Grout mixes for this purpose commonly have a Portland cement base, and depending on the application can contain a variety of additional components.  Typical additional grout constituents include fly ash, bentonite, silica fume, or sand.

Injection pressures are typically far lower than for compaction grouting applications, since the objective of subsealing is to fill voids, rather than to displace and compact weak soils.

Subsealing applications include:

Contact grouting, also known as "backpack grouting", is a similar process, but the term is typically reserved for filling with grout of the annular space between a permanent tunnel lining and the surrounding formation (ASCE, 1980).