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Leading geotechnical laboratory

Wiertsema & Partners has one of the best geotechnical  laboratories in the Netherlands. 

Laboratory tests

We can conduct a wide range of geotechnical and geohydrological tests:

  • Volume weight
  • Sieve analysis
  • Atterberg's consistency limits
  • Shear testing
  • Compression test
  • Triaxial test
  • Cyclic triaxial test
  • Permeability tests
  • Direct Simple Shear (DSS) test
  • Proctor test and core cutter method 
  • Constant Rate of Strain (CRS) test

Soil sample classification

An important activity in our geotechnical laboratory is the classification of soil samples. Our laboratory employees have many years of experience with this expertise.

Most soil samples in our laboratory are described according the Dutch standard NEN 5104. A part of the samples that we classify are from abroad. For these samples other classification standards are used. For projects in Germany the standard is the DIN. Samples from offshore projects outside Europe are mostly classified according the British Standard or the ASTM. 

Samples can also be photographed for which we have a special photo installation. The photos are digitally processed. 

Mobile laboratory

To perform laboratory tests abroad we have a specially equipped mobile laboratory. The mobile laboratory can be used on sea and land. The fully self-supporting 20 ft container can be shipped to every location in the world. 

We can perform all geotechnical tests in our mobile laboratory. The laboratory tests are carried out according the Dutch standards and/or international standards (NEN-, EU-, DIN-, ASTM- and BS-standard). We also use the same quality criteria we apply in our laboratory in the Netherlands.

Rheological research

Rheology is a term derived from the Greek Rheos which stands for 'current' or 'flow'. It is the part of science that studies the relationship between the forces exerted on the material and the deformation or movement that occurs as a result. 

With the Sludge Sampler we can take sludge samples at a known depth. In our laboratory we can test these samples on rheological properties. For this we are in possession of a Brookfield rheometer. This allows us to acquire the flow curves from the sludge samples, and, if desired, the viscosity and yield stress can be derived. 


  • determination nautical depth (based on yield stress);
  • fluidity of the sludge (determination fluid mud slope).