This binding agent can simply be cement, or a blend of cement with other products such as lime, fly ash or slag.
Soil-cement mix trenches are created using a specially adapted trenching machine designed to:
The Trenchmix® process creates in-situ continuous walls that may be described as lineic (viewed from above) or surfacic (viewed in elevation). When used alone, a continuous Trenchmix® wall can be used for cut-off application. Once structurally reinforced, a Trenchmix® wall can form a retaining structure which can be used as support of excavation. When used as a network of parallel or secant trenches, Trenchmix® walls can be used for soil improvement applications.
The soil-cement mixture can achieve an average compressive strength of around 3 MPa and hydraulic permeability valuesbelow 10-6 cm/s.
Wall thickness corresponds to the width of the blade used: between 350 mm and 500mm
Wall depth is governed by blade length.
Generates only small amounts of spoil
Not particularly environmentally intrusive
Lower consumption of resources (low use of water and no need of aggregates)
Fast and efficient
Continuous, seamless treatment
Excellent final hydraulic permeability. Better than a bentonite cement wall
Very good erosion resistance
Compatible with low headroom conditions
When in operation, generates no vibrations on nearby existing structures
Soil-cement mix l is homogenous on full height of the trench
This process offers a choice of two techniques. That choice will be determined by the nature of the soil, the type of work to be carried out and the moisture content of the soil.
The binder is introduced in the form of a liquid made of binder and water
The binder is introduced directly into the trench in powder form
Soil improvement for electrical tower foundation
To ensure the safety of its distribution grid in the aftermath of the 1999 storms in France, RTE (Réseau de Transport d’Electricité) initiated a campaign to identify and secure hundreds of electric towers in France. Amongst the various solutions possible one technique involved the construction of soil-mixed reinforcement blocks around each concrete footing of a tower while still in use. To do so, a low headroom Trenchmix® tool mounted on a hydraulic excavator was used. This equipment is called TrenchmiXS, XS meaning “extra small”.