Capability Statement

Non-Destructive Foundation Assessment


Our extensive experience in undertaking ground investigations enables us to provide appropriate parameters for optimal foundation design.

Our geotechnical and survey teams offer a multi-disciplinary service for overhead line, rail and underground cabling projects.


The extent of non-destructive testing recommended will be based upon the desk study work and techniques will include:

  • Transient dynamic response, TDR (including TECO) to assess the integrity of the concrete and the foundation depth using sophisticated impedance profiling and simulation software adapted from pile integrity testing.
  • BGC Map corrosion system to determine the rate of corrosion of the steel stub using linear polarisation techniques.
  • Soil resistivity testing as high resistance will limit electron flow and reduce corrosion potential.
  • Soil redox testing (an indicator of oxygen levels) and pH can affect the rate of corrosion of the sub-surface steelwork. High oxygen levels and acidic conditions increase corrosion potential.
  • Soil chemical testing – pH, sulphates (water soluble and acid soluble), total sulphur, chloride, magnesium, ammonium, aggressive carbon dioxide and nitrate for concrete design in aggressive ground.
  • Concrete testing – in situ carbonation testing to assess the penetration of potential carbonation associated with reinforcement corrosion and shrinkage.
  • Concrete testing – Schmitt hammer for compression strength and visual inspection.


We have taken the non-destructive testing of transmission line towers in-house and now offer a full range of foundation analysis:

  • Structural loading
  • Desk study incorporating quantified risk assessment (QRA)
  • Non-destructive testing
  • Intrusive inspection
  • Interpretive reporting
  • Foundation strengthening/upgrading design
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