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NYCAviation:
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Holding Up to Heavy Metal: What Airport Runways Are Made Of
A mile of runway can take you anywhere. We take a look beneath the surface to see how runways are engineered and maintained.http://nycaviation.com//feeds.feedbu...~4/Iayq0cUwVao
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http://www.lansingstatejournal.com/s...nway/21272767/
http://www.bizjournals.com/denver/bl....html?page=allQuote:
The $225 million runway that opened in 2001 at Detroit Metropolitan Airport is deteriorating well ahead of its expected life of 30 years because of a common problem with concrete used in recent years, authorities say.
“The cement manufacturing industry has increasingly been under pressure to reduce their levels of harmful emissions into the atmosphere,” said department spokesman Jeff Cranson. “This prompted them to modify their manufacturing process to incorporate a portion of the highly alkaline cement kiln dust back into their final product.”
“We have some projects … that are not performing like they’re supposed to do,” said Daniel DeGraaf, executive director and chief executive officer of the Michigan Concrete Association. “It’s not our proudest moment.”
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Reconstruction of Runway 7-25, one of the airport’s two east-west runways, started Tuesday. The project calls for replacing about 300 concrete slabs that are showing signs of deterioration, DIA said.