Contact Grouting

 

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Contact grouting, sometimes referred to as "backpack grouting", is a term is typically reserved for grouting the annular space between a permanent tunnel lining and the surrounding formation (ASCE, 1980).  In a broader sense, contact grouting involves the injection of fluid grout into an existing void to provide positive contact between a structure and an adjacent subgrade.  Subsealing is a type of contact grouting.

Typical contact grout mixes consist of neat cement, fly ash/cement and bentonite/cement.  Fluid grout is injected into voids, typically under very low pressure.

 

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