Anthropogenic contaminations of excavated material
Construction activities may contaminate excavated material with residual explosive, concrete, hydraulic fluids or diesel. These contaminations are usually low since the concentrations of these potentially hazardous substances normally remain beneath the legal thresholds.
However, these substances add up in the sludge of the gravel plant during the processing of the raw material. As a consequence, the pressed slurry (filter cakes) is often contaminated.
Unappropriate substances can also contaminate jetting excavation material so that special measures have to be defined for their further use or disposal.
Depending on the quantity and the nature of the contamination, there are numerous technical and chemical methods to eliminate problematic substances.
Geogenic substances in excavated material
Excavated materials can also contain natural substances that are harmfull for the environment and/ or health such as radioactive and asbestos minerals.
B+ G identifies potential contaminations of your excavated material and helps you find the best solutions.
Since 2021 B+ G supports a consortium for the tender of the material management lot. Based on our experience, the raw material is continuously tested in the construction site's own laboratory.
Concrete tests with sulphate-containing aggregates (produced from tunnel excavation) and special binders were carried out in the Modane intermediate attack on 7 April 2016.
Among other things, the sulphate resistance is to be investigated.
The new Spitallam dam in the Bernese Oberland will require around 200,000m3 of concrete. The mass concrete consists of a maximum grain size of 125mm! A gravel plant was built for the production of the aggregates. B+ G supports the client KWO in the quality of raw materials, aggregates and concrete.