This method has been widely experimented
and has been used for a number years in countries
such as Germany, France and the United Sates.
Soil stabilisation using cement and/or lime allows
terrain with unsuitable characteristics (e.g. clayey
and/or limey soils) to be used for embankments and
similar by simply treating the material in-situ.
The advantages, both short-term and long-term,
resulting from the use of this new method are quite
considerable, thanks to the reactions triggered
by the lime which tent to continue over
time. These advantages can be summarised
as follows:
• Notable increase
in the load-bearing capacity of the treated
ground;
• Elimination
of the actions of water in clayey-limey
soils;
• Increase in
the resistance to erosion and freezing-thawing
actions;
• Elimination
of fine clay particles in the treated ground;
• Increase
in the degree of workability of the treated
ground.
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Soil stabilisation using lime and/or cement has
its primary application in the consolidation
of prevalently limey or clayey strata,
including in fill material, in order to obtain a
substructure and/or embankment or similar possessing
a high load-bearing capacity.
This application replaces the traditional
method which involved removing the material,
with its high clay component (considered as unusable),
transporting it to tip and replacing
it with gravel-based aggregates; much more expensive
and often not readily available.
This stabilisation method is primarily used
for:
• Forming
embankments for roads, motorways, airports, railways,
car parks and industrial hardstandings;
• Reinstatement
of rubbish tips and industrial areas;
• Cycle
paths and sports grounds;
• Formation
of load-bearing wearing courses;
• Canal
and river banks and beds.
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Before carrying out any treatment,
a study of the ground must be carried
out in order to identify the suitability
of the soil and the precise formula of the mix
to use, i.e.:
• Identification
of the granulometric curve of the soil;
• Determination
of the geotechnical characteristics (Atterberg
limits, Proctor Test) of the soil;
• Selection
of a suitable binder (lime/cement) and
percentage to use;
• Design
of a suitable mix. |
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After the preliminary diagnostics
phase, the actual works consist of the following
activities:
• Application
of the binder (spreading);
• Mixing
of the binder with the soil;
• Compaction
of the soil-binder mix.
Depending on the percentage humidity
present in the layer of soil to treat and the climatic
conditions at the time, it is possible to carry
out the spreading operation either using the "wet
method" (using special water-lime
mixers) or by "sprinkling"..
These operations are carried out using specially
designed and built machinery such as stabilisers,
binder-spreaders, vibrating plate compactors and
rubber tyred rollers of suitable weight. VITALI
S.p.A. has all the equipment and machinery necessary
for guaranteeing optimum results from soil stabilisation
using lime (or other binder) as well as
geotechnical laboratories as backup. |
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AVAILABLE
MACHINERY AND EQUIPMENT AND TECHNICAL CHARACTERISTICS
WIRTGEN WR2000 STABILISER
- Milling width 2000 mm
- milling depth 500 mm
- complete with 158 tooth milling drum, water and/or
emulsion spray
PANIEM BINDER SPREADER model P15
- Spreading capacity from 3 to 6 litres/square
metre
- 3-width spreader modules
- dust prevention system complete with water tank
and pump
HAMM ROLLER COMPACTOR 3625 HT
- Vibrating compression roller 25,500 kg
- width 2500 mm
HAMM ROLLER COMPACTOR 3523 HT
- Vibrating compression roller 23,000 kg
- width 2500 mm
TYRED, PLATE AND ROLLER COMPACTORS, VARIOUS
SIZES AND WEIGHTS
Tyred vibrating plate rollers with optional
padded foot shell kit |
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