Different Types of Grout Injection System
Grout
injection techniques were developed to simply fill a void in the soil. It is
gaining immense popularity worldwide owing to its easy use system. Discussed
are some of the popular grout injection system available.
Permeation Grouting
Permeation
grouting, also known as penetration grouting, is the most common and
conventional grouting method. It involves? lling any cracks, joints or void in
rock, concrete, soil and other porous materials. The idea is to? ll a void
without displacing the formation or creating any change in volume or conjuration
in the medium. This is typically done to strengthen the existing formation,
creating an impermeable water barrier or both. There are two forms of
permeation injection systems: a circulating grout system and a direct grout
system.
Compaction Grouting
Compaction
Grouting involves injection of low mobility grout via drill casings that are
drilled/driven to pre-set depths. The grout, usually comprised of cement, sand,?
y ash and water, is placed from the bottom-up with pressure based criteria.
After each consecutive stage, the drill casing is lifted upwards until it is
entirely taken out. Compaction Grouting is also commonly known as Low Mobility
Grouting.
Fracture Grouting
Fracture
grouting uses a low viscosity grout that splits through the ground by hydraulic
fracturing and penetrates into the fractures. The in-situ soils are displaced
and soil immediately next to the fractures are densied, but to a lesser extent
than compaction grouting. Fracture grouting can also be referred to as
compensation grouting and is commonly used to relevel structures.
Jet Grouting
Jet
grouting uses a high-pressure ‘jet’ of either grout, water, air or a
combination to erode soil whilst simultaneously injecting grout into the soil
through a ‘jet monitor’. The specially designed drill stem and monitor are
raised and rotated at the same time to combine the grout with the original soil
to form ‘soilcrete’. The end product is cemented round columns and is basically
effective in any soil but not necessarily efficient in every soil.
Vacuum Grouting
Vacuum
Grouting Interestingly, although grout is typically propelled by pressure, if a
void is placed under pressure then the grout can be ‘sucked’ in this is known as vacuum grouting.
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