• The new Trump International Hotel and Tower sits on the Chicago River, on the site of the old Chicago Sun-Times building.

    Prairie Materials is producing concrete for the project. In preparation for the job, three of Prairie's technical service people conducted testing for six months to prepare the project's unique mix designs, some of which had never been used before. They included:

    10,000 psi compressive strength for ten-foot-diameter caissons

  • 10,000 psi, low heat SCC for the 10-ft-thick, 4700 cu. yd. mat slab; the largest single SCC placement in the U.S.
  • 8000–12,000 psi for columns and core walls
  • 5000 psi for floors
  • 12,000–16,000 psi SCC for transition floors, to transfer column loads and provide wind shear resistance.
  • To meet the strict specifications, Prairie developed SCC mixes that could make the required high strengths, and meet specifications where modulus of elasticity was considered as important as compressive strength. Designing an SCC mix for good pumpability was especially important, since the concrete for the entire 92-floor building will be placed with ultra-high-capacity pumps.

    The producer's challenge was to produce high-strength, high-modulus mixes, consistency between loads, and slump spreads of 28 inches that allowed the SCC to move approximately 50 feet from the point of placement. All this while still maintaining the restrictive temperature controls on the mixtures, both at the time of placement and during the initial curing period.

    Related Links

    For more project details visit:

    Reaching New Heights in Chicago from the June 2007 issue of our sister publication, Concrete Construction Magazine.

  • Read, Towering Achievement, the feature on one of the projects of a lifetime, the Wachovia Corporate Center.
  • Other Projects of a Lifetime City Center, Las Vegas, Nev.
  • Freedom Tower, New York City, New York
  • Olivenhain Dam, San Diego, Calif.
  • Wachovia Corporate Center, Charlotte, N.C