Harland & Wolff Dry Docks: Forensic Marine Diagnostics

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Harland & Wolff Dry Docks

Non-Disruptive Scanning

The massive dry docks at Harland & Wolff in Belfast represent a triumph of historic maritime engineering. Globally renowned as the shipyard that built the RMS Titanic, the site remains a critical piece of Northern Ireland’s industrial heritage. However, operating in a highly aggressive saltwater environment means these historic concrete structures are under constant chemical attack.

When significant sections of the dock walls began to suffer from severe concrete spalling – violently ejecting chunks of the facade and exposing the internal steel reinforcement grids – the visual damage was undeniable.

But in structural engineering, the visible damage is only the symptom. The true danger lies in the invisible degradation spreading silently through the rest of the structure. Before any physical repair could be safely specified, asset managers required empirical data on the hidden pathology of the concrete.

Structural Scanning was deployed to the site to execute a comprehensive, non-destructive testing (NDT) regime, providing the exact engineering data required to formulate a permanent remediation strategy.

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ClientHarland & Wolff
AssetHistoric Dry Docks, Belfast
ScaleMulti-acre marine infrastructure
InterventionCover Meter Surveys, Half-Cell Potential Mapping & GPR
ObjectiveMap invisible chloride fronts and active corrosion hotspots to specify targeted remediation

The Challenge: The Invisible Chloride Front

The dock walls were suffering from advanced chloride-induced corrosion. Saltwater had penetrated the concrete over decades, initiating rapid rusting of the internal rebar and causing catastrophic rust-jacking.

While the areas that had already spalled were obvious, the critical engineering challenge was identifying the areas that were about to fail. How far had the invisible chloride front penetrated into the seemingly healthy concrete? Which sections of hidden rebar were actively oxidising?

Relying on visual inspections alone would have been a high-risk gamble, inevitably resulting in under-specified repairs and repeated, cyclical failures.

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Specialist Diagnostics for the Water Sector

To capture flawless empirical data, our specialist diagnostic teams mobilised advanced NDT equipment directly to the failure planes. Given the immense scale of the dock walls, we deployed Mobile Elevated Work Platforms (MEWPs) to provide our engineers with safe, close-quarter access across the entire vertical facade.

Operating in the shadow of the iconic Harland & Wolff gantry cranes, our engineers systematically mapped the structural matrix:

  1. Cover Meter Surveys We conducted extensive cover meter surveys to determine the exact depth of the concrete protecting the reinforcing steel. By mapping areas of critically low cover, we identified the structural zones most vulnerable to accelerated chloride and carbon dioxide penetration.
  2. Half-Cell Potential Mapping To find the invisible corrosion, we deployed half-cell potential testing. This advanced electrochemical technique measures the electrical potential of the internal rebar. By mapping these electrical currents, we accurately plotted active “hotspots” of corrosion hidden deep behind perfectly intact concrete faces – identifying the exact areas destined to spall next.
  3. Ground Penetrating Radar (GPR) Using high-frequency GPR scanning, we transmitted radar pulses into the massive retaining walls. This allowed us to assess the internal structural geometry, locate hidden voids, and verify the spacing and condition of the deeper reinforcement grids without drilling a single invasive core.
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The Result: Data-Driven Remediation

The deployment of advanced NDT completely transformed the project from a reactive maintenance issue into an engineered, proactive structural intervention.

By providing the asset authorities with comprehensive, data-rich diagnostic reports, Structural Scanning pinpointed exactly where the unseen chemical attack was concentrated. This empowered the repair contractors to specify targeted breakout zones, precise anti-corrosion treatments and perfectly scaled BS EN 1504 concrete reinstatement.

We eliminated the guesswork, saving the client significant capital expenditure while permanently securing the operational safety of one of the UK’s most important maritime assets.

Diagnose Before You Demolish

Do not wait for your concrete infrastructure to fail before you assess it. Find the problem before the concrete falls.

Contact the diagnostic experts at Structural Scanning today to arrange a comprehensive NDT survey of your commercial or marine assets.

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RMS Titanic ready for launch at the Harland & Wolff Shipyards, Belfast 1911

RMS Titanic ready for launch at the Harland & Wolff Shipyard, Belfast 1911