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Fehmarnbelt Exposure Site

Femern A/S, the Owner of the coming Fehmarnbelt Fixed Link, through an open tender process selected the Concrete Centre at Danish Technological Institute as its external concrete laboratory.

The contract involved the design, production and testing of a range of concrete types of interest to Femern including some concrete blocks with instrumentation for monitoring of the initaiation and progress of corrosion, establishing an exposure site in Rødbyhavn harbour for long-term testing of concrete, monitoring of the concrete at the exposure site.

An extensive testing program of the selected fifteen concrete types including three SCCs was initiated comprising documentation of:

  • Workability, density, and air content
  • Initial setting time and bleeding
  • Strength development (compressive and split tensile)
  • Frost resistance and air void structure
  • Chloride ingress resistance
  • Microstructure (petrographic analysis).

The concrete was produced under strict control at the Concrete Centre’s HighTech Concrete Laboratory. Altogether thirtyseven concrete blocks and a large number of small test specimens were produced. Fifteen large concrete blocks (400 litres – 2 x 1 x 0.2 m) each having different concrete composition and seven instrumented blocks have been placed partly submerged in Rødbyhavn harbour. The concrete blocks will be monitored closely at least until the end of the construction period, which is expected to be in 2020.


Crane placing concrete blocks in Rødbyhavn harbour.
Kranplacering af blokke i Rødby.
Crane placing concrete blocks in Rødbyhavn harbour.

Block H and I in Rødbyhavn harbour after 6 months.
Blok H og I i Rødby efter 6 mdr.
Block H and I in Rødbyhavn harbour after 6 months