High-Performance Concrete in All-Weather Deck Poursby Glenn W. Strand, W.R. Grace & Co, St Paul, United States,
Abstract: A high-performance concrete mix enhanced with a combination of microsilica, superplasticizer, and high dosages of an corrosion-inhibiting, accelerating admixture (calcium nitrite); proved to be advantageous for pouring exposed parking decks during both very hot and very cold conditions in Minneapolis. This was the first major project in the United States to utilize both microsilica and calcium nitrite corrosion inhibitor for improved durability and resistance to road salt induced corrosion. Both the unique mix design and carefully planned construction procedures allowed a concrete that might have otherwise been assumed to be difficult, to be quickly placed and post-tensioned in conditions with air temperatures as low as -5°F (-21°C). The workability and all-weather adaptability of this high-performance concrete mix, along with the successful techniques of the construction team, in a wide variety of temperature conditions; may unshackle concrete from many of its limitations as a construction material in cold regions.
Subject Headings: High-performance concrete | Weather conditions | Concrete admixtures | Construction materials | Concrete construction | Decks | Cold region construction | Construction methods | Corrosion | Materials processing | North America | United States | Minnesota | Minneapolis
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