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Mechanical characteristics and permeability of
porous/fissured soil can be fundamentally ameliorated by injection
of appropriate grout mixtures. Until few years ago injections
were applied only to very permeable soil (gravel and sand) or
fissured rocks with water cement mixtures, sometimes clay or
bentonite stabilized.
Nowadays, however, even medium to low permeability soil (fine
sands) can be treated. Even lower permeable ground can be
consolidated.
The most important requirement of a grout is that it completely
fills the space in which it is placed. Therefore, it must
have a negligible shrinkage and remain stable in place, without
cracking, delaminating or crumbling.
The primary function of the grout is to fill voids in the
coarse aggregate, to bind them together upon hardening and
to consolidate the entire mass. The quality of PAC concrete
depends on the use of a grout mixture, which is cohesive,
workable and develops sufficient strength in the hardened
state.
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