Inspection of coatings on bridges and risk analysis for repair

After an initial visual inspection unveiling paint defects and/or visible corrosion, the city of Brussels selected 8 bridges for further investigation. The objective was to collect data and analyse the condition of these bridges showing visual defects and to prepare a risk analysis regarding the paint system of the steel substrates before starting any maintenance or repairs. In collaboration with CLUSTA, different tasks were dedicated to ENDURES and OCAS. An accredited ENDURES inspector examined the coatings, including on-site tests and measurements for thickness, adhesion, porosity, etc. OCAS analysed the paint flakes collected by ENDURES, focusing on carcinogenic, mutagenic, or toxic for reproduction (CMR) substances, heavy metals (in particular, lead) and Polycyclic Aromatic Hydrocarbons (PAHs). PAHs, found primarily in coal tar coatings, are toxic contaminants that do not break down in the environment and are harmful to humans. Asbestos sampling and analysis were outsourced to an approved company. Risk assessment was carried out before starting any maintenance work on the bridges. Based on the readings and analysis results of paint flakes, advice was provided regarding possible repair. The inspection and paint sampling for the 8 bridges were completed in only 2 months. Paint flake analysis (‘CMR inventory’) on 25 coating samples was carried out and a risk analysis was proposed for each bridge.

ENDURES’s inspection expertise combined with OCAS’s competence in the field of health and product safety guaranteed a rapid and smooth approach.

Ko Coppoolse & Philippe Legros