GLOSSARY OF
COMMON TERMS

 

 

CHEMICAL GROUTING is the injection of one or more near-water viscosity liquids into a cohesionless soil to create an impervious sandstone-like mass.  Because chemical grouting literally creates "instant sandstone" as tough as the real thing, it is one of the most successful techniques for stabilizing soils and controlling ground water.

COMPACTION GROUTING involves the injection of a very stiff mortar-like grout that is designed to stay in a homogeneous mass, thereby displacing and compacting the existing soil mass.

CONSOLIDATION GROUTING is the injection of a fluid grout, usually Portland cement and possibly sand, into a compressable soil mass in order to displace it and form a lenticular grout structure for support.

EPOXY CRACK INJECTION utilizes epoxy grout to structurally "weld" cracks to permanently restore the integrity of a structure.   Once cured, the epoxy is stronger than the existing concrete, yet can be formulated to retain flexibility to compensate for future movement.

PENETRATION GROUTING is mainly used to fill joints or fractures in rock or large pore spaces in order to strengthen the existing mass and eliminate movement or water flow, without disturbing the formation.  It requires a slurry mix design of water, Portland cement, fly ash, sand or any combination thereof.

PERMEATION GROUTING penetrates voids in a mass, replacing water or air between grain particles - at low pressure to prevent fracturing - then stiffens the mass as a whole.  If a cementitious grout is used, it must be thoroughly mixed with a high-shear mixer.  Chemical grouts or micro-fine cement grout, alone or in combination, work well for this method.

PRESSURE CRACK INJECTION can be used to stop leaks, seal cracks and restore strength of cracked concrete.  There are two types: Epoxy Crack Injection and Urethane Crack Injection.

PRESSURE GROUTING - The term "pressure grouting" covers a wide range of techniques, such as Permeation Grouting, Penetration Grouting, Consolidation Grouting, Compaction Grouting and Pressure Crack Injection.

URETHANE CRACK INJECTION is used to treat water leakage at joints or cracks.  After injection into a joint or crack, the urethane grout reacts with water and expands, creating a tight, permanent seal against water flow.   Modified urethane grouts can also be used successfully to seal cracks or bond cracked surfaces together.