Clayco, Inc. and concrete sub Concrete Strategies, Inc. recently completed a 2 story parking garage for online brokerage firm Scottrade in St. Louis, Missouri. Information from intelliRock concrete maturity sensors was used to time critical workflow activities such as post tensioning.
Left: Scottrade Building HQ and garage site in St. Louis, MO.
Right: Post tension cables which were stressed in two stages, 1600 PSI and 3000 PSI
Concrete Strategies VP, Barclay Gebel explains “For crack controlling reasons we stressed the PT cables in two stages. The first stage was when the concrete achieved 1600 psi and the second stage was 3000 psi. We use intelliRock to determine when to do the stressing.”
Project engineer Curt Costello continues, ”We were able to determine when different crews would come in to start stripping forms and preparing the PT cables for stressing. Once the strengths were met, we were able to stress the cables without losing much time. This was because we were able to anticipate concrete strengths based on information from intelliRock.”
The graph above is an example of the information available to Concrete Strategies in real-time at the jobsite. intelliRock sensors evaluated the concrete’s maturity every 60 seconds. The maturity reading could be correlated to a concrete strength using a calibration curve for the mix design. This gave Concrete Strategies up-to-the-minute concrete strength values.
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Clayco, Inc. is one of the nation's largest, privately owned real estate, architecture and engineering, design/build and construction firms. Read more about Clayco at www.claycorp.com.
Concrete Strategies is a leading edge, full service, design/build and general contracting firm specializing in all forms of concrete and structural steel construction. The firm operates nationally and has an unparalleled track record in architectural site cast concrete, structural concrete, flatwork and all types of self-perform construction related to commercial projects. For more information see their website at www.concretestrategies.com