EDITORIAL Thermal zinc
Futureproofing infrastructure with galvanised steel
In South Africa, where ageing waterworks, sewage systems, and railways urgently require upgrades, new and refurbished infrastructure must not only endure for decades but thrive under demanding conditions.
Hot-dip galvanised steel has become central to achieving this.“ Galvanising is about more than just corrosion protection,” says Simon Norton, Director of the International Zinc Association( Africa).“ It’ s about creating infrastructure that stands the test of time, with reduced maintenance, greater resilience, and significant savings for taxpayers.”
Galvanised steel is essential for sustainable development, particularly in coastal areas, where galvanised rebar in concrete resists the corrosive effects of salt and carbonation. Cape Town’ s seafacing retaining walls at Clovelly on the False Bay coast demonstrate how galvanised steel rebar performs under extreme conditions. harshest corrosion environments. By extending the lifespan of infrastructure, galvanising reduces repair costs and disruptions while supporting the circular economy by minimising replacements and the materials consumed in maintenance.
Galvanised steel is not just about addressing current challenges; it is about anticipating future needs.“ As we build infrastructure that must last, reduce capital costs, and remain durable for decades, galvanised rebar is indispensable,” concludes Norton. Its role in sustainability, cost-saving, and environmental resilience secures its place in the future of construction. ■
Bridges and the protection against corrosion
In coastal areas, bridges are exposed to high humidity and chlorides. Galvanised rebar has been successfully used in bridge construction to ensure long-term durability and prevent corrosion-related failures. In Cape Town, all new bridge construction or repairs require the use of hot-dip galvanised rebar in concrete structures.
Luxury apartments along the prestigious Mouille Point, Sea Point and Camps Bay beachfronts in Cape Town have suffered damage to columns and balconies due to the absence of galvanised rebar in the original concrete.“ With property prices reaching astronomical levels and owners facing hefty repair costs, all concrete along the East and West Coasts should contain hot-dip galvanised reinforcing steel. Nothing less will suffice,” urges Norton.
Structures exposed to seawater, such as wharfs and docks, are particularly vulnerable to corrosion. Galvanised rebar offers exceptional protection against marine corrosion, extending the service life of these concrete structures.
Environmental resilience and cost efficiency
The sacrificial nature of zinc ensures that galvanised steel rebar in concrete structures withstands the
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