ner or Difficult Problem?
Many Factors to Consider Freas pointed out that life-cycle costs may not be the only
factor to take into account when it comes to the repair vs. replace question. In some instances, the airport needs to realign a run- way or change the grade, at which point all associated concrete areas may be completely removed and redone. Similarly, the Port of Oakland in Northern California some-
times has to look beyond the subject of life-cycle costs for certain structures. One tenant, for instance, utilized an 80-year-old wharf complex for container crane operations. While the wharf clearly needed to be rebuilt, the port had no temporary site available. Repair was the only possibility. Another time a tenant dropped a 60-ton piston from a height
of 100 feet onto a wharf, resulting in severe damage. In this case, life-cycle costs favored repair. The port harnessed epoxy injection for the wharf deck and underside. “I’ve inspected the wharf below sea level, and the cus-
tomized epoxy prevented any corrosion of the rebar, returned the structure to its original strength and extended its lifespan,” said Bill Morrison, Manager of Harbor Facilities for the Port of Oakland. “After many years, these wharves are still operating as designed.”
The KIN The KI G
Repurposing for changing times ChemCo Systems’ Bors discussed another important trend.
Governments worldwide are passing regulations and may offer monetary incentives to recycle or adaptively reuse existing build- ings, rather than choosing demolition. This is happening widely in China’s large cities, where owners are rewarded if they agree, for example, to convert an old hotel into condos or an aging office structure into a warehouse. Parking decks have been transformed into computer server
farms in Beijing. “This repurposing trend for existing buildings is a high-
growth element of the sustainable construction movement,” Bors said, “and [it] is beginning to eclipse new construction in urban areas of North America” due to architectural preservation, envi- ronmental and waste-disposal concerns. “Whether you elect to repair or replace, do it right, use the
correct materials and consult an engineer who can help you eval- uate your options from a life-cycle costs perspective,” Bors said.
Drew Robb, a Los Angeles-based writer specializing in business, engi- neering and technology, can be reached at
press@powerpr.com.
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