TThe University of Notre Dame Campus Crossroads Project was the largest construction venture undertaken at the University since its opening in 1842. The $400 million, LEED Silver project consisted of attaching three new buildings onto the existing iconic Football Stadium; increasing the Stadium’s capacity by 750,000 square feet.
The total project entails 58,000 cubic yards (yd3) of concrete, with over 13,000 yd3 of mass concrete. The mass concrete could not exceed 158 degrees Fahrenheit (°F) at its core. Therefore, the mass concrete contained 70% slag cement to control the temperature rise of the mass concrete.
The 70% slag cement was employed to better control the temperature rise of the mass concrete. Thermocouples placed into the mass concrete revealed that no foundation exceeded 130°F. Some mass concrete structures required pours of over 1,000 yd3. Many of these mass concrete placements were completed in conditions where ambient temperatures were below 10°F. Even in these extreme conditions, the maximum differential between the core and extremity of each member was kept below the 35 °F limit of the specifications.
Slag cement contributed greatly to keeping the temperature of the mass concrete under control, which was vital to the success of the mass concrete foundations. Despite utilizing the slag cement at 70%, the 28-day design strengths were typically obtained in only 7 days.
Project credits: University of Notre Dame, Owner; S/L/A/M Collaborative, Architect; Structural Design, Inc., Engineer; Barton Malow Company, Contractor; Ozinga Ready Mix Concrete, Inc. Indiana Division, Concrete; LafargeHolcim, Slag Cement