A continuous reinforced-concrete tidal seawall protecting the south-eastern stretch of Victoria Island from Atlantic surge. Originally cast in 1989 with locally-sourced aggregates and Type I Portland cement, the structure was reinforced in 1996 following early signs of cover spalling and again in 2012 after a major coastal surge event.
The case is significant because it sits at the intersection of three rarely-overlapping stress regimes: high chloride loading from continuous Atlantic spray, sustained tropical humidity above 80%, and seasonal monsoon-driven mechanical erosion.
Documentation began in 1989 as part of a Lagos State Public Works survey, was continued by the University of Lagos Civil Engineering department from 2003, and joined the DecayData archive in 2022.
- Chloride-induced corrosion of rebarsince 1996highPrimary failure mode.
- Cover spalling (corrosion-driven)since 1998highDriven by chloride-induced rebar expansion, not freeze-thaw.
- Halophilic biofilm (cyanobacteria)since 2003mediumIntertidal zone only.
- Sand abrasionsince 1989medium
- Atmospheric carbonationsince 2010lowAbove tide line.
- 01Reinforced concrete · class XS3