Description du projet
Une nouvelle façon de contrôler la corrosion de l’acier dans le béton
Pour les infrastructures construites en béton armé, la corrosion de l’acier dans le béton constitue un défi majeur. Comment les conditions environnementales en service, comme le CO2, influencent-elles la stabilité et la défaillance (corrosion) de la couche passive sur les barres d’armature en acier noyées dans les blocs de bétons? Le projet PERFoRM, financé par l’UE, répondra à cette question. Il appliquera des techniques non destructives pour effectuer un diagnostic in situ des bétons armés et un traçage in situ des ions agressifs. PERFoRM appliquera également des approches électrochimiques innovantes pour déterminer des taux de corrosion ressemblant étroitement aux structures en béton en service. Le projet emploiera la spectroscopie photoélectronique par rayons X (XPS) environnementale pour réaliser une caractérisation avancée des mécanismes de formation de la couche passive.
Objectif
PERFoRM will unveil how in-service environmental conditions influence the stability of the passive layer on steel rebar embedded in concretes based on low-carbon cementitious materials (i.e. near-neutral salt activated slag materials (NnSAS)), when exposed to environmental threats. NnSAS offer high carbon emission savings, compared to other construction materials, however their long-term performance is largely unknown. PERFoRM will implement non-destructive techniques (NDTs) for the in-situ diagnosis of steel reinforced concretes, and in-situ tracing of aggressive ions; along with cutting-edge electrochemical techniques to determining corrosion rates closely resembling in-service concrete structures. Advanced characterisation of the passive layer using environmental XPS, and the steel-concrete interface using u-CT will also be carried out. The main scientific focus areas of PERFoRM will be:
• Developing novel durability wireless embedded (D-WirE) sensors for in-situ tracing of aggressive ions (e.g. chlorides) and monitoring of internal factors (e.g. relative humidity, pH) in concrete
• Ground-breaking work monitoring chemical and physical changes induced by carbonation/chloride penetration in NnSAS mainly using NDTs
• Advanced characterisation of the passive layer growth, breakdown, and failure rates of steel rebars embedded in NnSAS
• Creation of service-life models by incorporation of in-situ carbonation and chloride penetration regression models
PERFoRM will bring unique insight about all potential aspects influencing corrosion mechanism and stability of the passive layer forming in steel embedded in NnSAS. This will enable performance-based materials design, and selection of remediation strategies to ensure the safety of in-service novel self-sensing and low-carbon NnSAS. PERFoRM will be integrated with collaborative programmes coordinated by RILEM and EFC, providing a direct route to international awareness and utilisation of the fellowship outcomes.
Champ scientifique
Programme(s)
Régime de financement
MSCA-IF-EF-ST - Standard EFCoordinateur
LS2 9JT Leeds
Royaume-Uni