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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
:
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.
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
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Observed damage types
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Performance indicators
:
Chemical properties, Electrical properties, Spatial properties (concrete cover/duct voids)
Images
(No images available for this case study.)
Documents
This case study was contributed by Frida Liljefors of Norwegian University Of Science And Technology. Last edited by technical staff.
