Challenge: Many elements of the iconic skyscraper were facing embedded steel corrosion, including the structural steel lattice columns within the colossal terracotta enclosures. The expansion of the steel caused by the corrosion was severely damaging the masonry cladding and cracking the six-foot-tall terracotta bison heads.
Strategy: Installation of an impressed current cathodic protection (ICCP) system at the steel sections with the colonnades on 29th to 32nd floors. The system consisted of LoCem® +point® anode mortar was applied within the bed joints and drilled in to provide 360° protection of the steel surfaces. The bison heads were deconstructed, steel cleaned-up and masonry reconstructed. LoCem® is a low carbon cement alternative (AACM), which can also act as a cathodic protection anode for controlling steel frame corrosion.
Outcome: The ICCP system resulted in long-term performance and control for the whole life preservation of our clients’ assets. Using AchillesICP for control over corrosion rate, and AiMS to collect the data, the client had full transparency over structural health and the power to make predictive maintenance decisions.
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