Fibrillated Microfibers

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Concrete Topping

Project Description:

In June of 1985, the Minnesota State Fair Authority constructed a new white-water raft ride at the fairground facility in St. Paul. Designed by Barr Engineering of Minneapolis, the ride consisted of a 1/4 mile of simulated lakes, streams, and rapids using poured-in-place concrete. Barr specified FORTA® ULTRA-NET® reinforcement to add to the structure's long-term durability, by enhancing resistance to abrasion, impact, and cavitation. The crack-controlling FORTA® reinforcement also aided in reducing the concrete's permeability and possible cracking caused by the constant wetting and drying action. In addition to the water ride, the Authority also constructed an adjacent 2-level precast concrete parking garage to facilitate additional park visitors. The 37,000 square foot upper level of the structure consisted of a 2" thick FORTA®-reinforced concrete topping over precast double-T's. The three-dimensional fiber did not negatively affect the performance of the topping bonding agent, and added positive concrete characteristics to resist the effects of exposure to weather, wetting and drying conditions, and deicing salts on the exposed deck. The FORTA® polypropylene fiber allowed for the elimination of conventional wire mesh in the thin topping, and provided a durable protective wearing surface over the structural concrete members.

Project Photos: Click on a photo for larger view.

• Owner: State of Minnesota, Minnesota Fairgrounds Authority, St. Paul, MN
• Specifier: Barr Engineering, Minneapolis, MN
• General Contractor: Acton Construction Co., Hugo, MN
• Ready-Mix Producer: Cemstone Concrete, St. Paul, MN

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