When Milwaukee's General Mitchell Airport Authority decided to build a 600,000-square-foot, 2,300-car parking structure, one of the bid requirements called for separate proposals for silica-fume concrete and a traffic membrane. In a bid submitted by Milwaukee contractor C.G. Schmidt Co., silica-fume concrete was less than half the cost of a traffic membrane and offered several advantages.
One of the main benefits of silica fume is increased concrete strength. It is also less susceptible to chloride-induced corrosion. This was an important consideration because of Milwaukee's severe winters and frequent use of road salt.
Schmidt was awarded the contract, along with the company's proposal to use silica-fume concrete. The parking structure was completed in nine months - on time and within budget.