Bavarian tunnel (case study)

A 400 meter long tunnel in southern Bavaria, Germany, was analysed for corrosion. The tunnel was built in 1995 and the concerns emerged in 2014 during inspection. The exposure to de-icing salts and drying and wetting cycles is high.


Object description

A 400 meter long tunnel in southern Bavaria, Germany, was analysed for corrosion. The tunnel was built in 1995 and the concerns emerged in 2014 during inspection. The exposure to de-icing salts and drying and wetting cycles is high.

Civil engineering type
:
Road network Tunnel
Year of construction
:
1995
Composed of materials
:
Location coordinates
:
48° 47' 24.70" N, 11° 29' 54.07" E
Country
:
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Object analysis

A probabilistic condition assessment was carried out. The probability of corrosion was updated with data from half-cell potential measurements with a Bayesian approach. Spatial variability was addressed. The reliability of the assessment was influenced by defect size, grid size, threshold potential and moisture conditions.

Case type
:
Research

Object state

A priori probability of depassivation was predicted based on chloride content and concrete cover measurements for the life time of the structure. The tunnel segment was divided into 13 x 13 cm elements and each element was updated with half-cell potential data, assuming spatial independency among the elements.

Observed deterioration processes
:
Observed damage types
:
Performance indicators
:
Chemical properties, Electrical properties, Spatial properties (concrete cover/duct voids)

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This case study was contributed by Frida Liljefors of Norwegian University Of Science And Technology. Last edited by technical staff.