Soil stabilisation using lime and/or concrete

Soil stabilisation using lime and/or concrete 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 areas;
  • Reinstatement of rubbish tips and industrial areas;
  • Cycle paths and sports grounds;
  • Reinstatement of rubbish tips and industrial areas;
  • Formation of load-bearing wearing courses;
  • Canal and river banks and beds;
  • Regeneration;
  • Cold asphalt.

Methodology

This method has been widely experimented and has been used for decades in a lot of 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 that continue over the time.

  • 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.

Preliminary phase

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:

  • 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.

Execution phase

After the preliminary diagnostics phase, we proceed to the execution phase:

  • Application of the binder (spreading);
  • Mixing of the binder with the soil;
  • Compaction of the soil-binder mix (compaction).


Depending on the percentage of 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 machineries such as stabilisers, binder-spreaders, vibrating plate compactors and rubber tyred rollers of suitable weight. VITALI S.p.A. has all the equipments and machineries necessary for guaranteeing optimum results from soil stabilisation using lime (or other binder) as well as geotechnical laboratories as support.