Context
CIDECO was commissioned by the Interdepartmental Directorate of Roads (DIR) Centre-East to carry out the structural diagnosis of the Rive-de-Gier Viaduct, which carries the A47 motorway over residential areas between Saint-Étienne and Lyon.
Operations
- Rebar detection and concrete cover measurement (GPR surveys and local destructive tests)
- Verification of concrete cover thickness to assess protection against aggressive agents (carbonation, chlorides)
- Powder sampling for laboratory analysis of free chloride content
- Paste sampling for laboratory analysis of cement dosage, density, and porosity
- Corrosion potential measurements to evaluate active corrosion in reinforced concrete elements
- Core drilling for compressive strength testing
- Beam-end inspections to assess sealing condition
- Surface cohesion tests
- Repair and reinforcement recommendations
Key figures
212
meters in length
11
destructive tests
7
concrete cover measurements
7
corrosion potential readings
11
powder samples
30
core samples
15
surface cohesion tests
