Concrete City:  

Chicago’s Role in The Modern Concrete Skyscraper

Chicago’s identity as a center of iron and steel high-rise skyscraper development is richly earned. However, in the late 20^th century, it was also one of the most critical hubs of concrete innovation.  Six towers built between 1960 and 1990 set records for height and, simultaneously, for concrete strength.

Why in Chicago?  Geography, geology, building culture, and collaboration all played roles.  The city’s concrete industry was homegrown, with one company in particular forging new mixes and transportation strategies, and another pioneering formwork techniques and jobsite standards that improved efficiency, finish, and schedule.  By the mid-1960s, concrete was highly competitive in Chicago’s construction market. Skyscrapers such as the Brunswick, Chestnut-DeWitt Apartments, and Lake Point Tower exploited concrete’s naturally monolithic behavior to pioneer new techniques.

This paper draws on archival materials, contemporary press accounts, and oral histories to reveal an underappreciated narrative in the city’s architectural and engineering history and the history of concrete skyscrapers.  Chicago’s collaborative building culture has made it the world’s center of concrete engineering and innovation—a legacy that informed the design and engineering of the current world record holder for height, the Burj Khalifa, and its likely successor, the Jeddah Tower, both designed in Chicago.

Learning Objectives:

• Understand the importance of collaborative research to the development of high-strength concrete
•  Understand the role of mix design and admixtures in high-strength concrete throughout the 20^th century
• Understand how concrete influenced structural form in high-rise design in the late 20^th century.

Location

Cliff Dwellers Club
200 S. Michigan Ave, 22nd Floor
Chicago, IL 60604

Menu

• Bibb Lettuce and Belgian Endive, Asparagus and Orange and Grapefruit Sections, Walnut and Apple Cider Vinaigrette

• Roast Prime Rib of Beef Au Jus

• Chocolate Mousse with Berries

Presentation time:  6:00 – 7:00 pm
Cocktail hour:  5 – 6 pm

Registration

In Person:   Member - $75;  Non-Member - $115
Live Streaming:  Member - $35;  Non-Member - $50 

In Person registration closes January 9th. Online registration closes one hour before the presentation. 

About the Speaker

Thomas Leslie, FAIA 

Thomas Leslie, FAIA, spent seven years with Norman Foster and Partners, London, where he worked on the extension to the Joslyn Art Museum, Omaha, Nebraska, the Al Faisaliah tower complex in Riyadh, and the Center for Clinical Sciences Research at Stanford University.  Since 2000, he has taught building science, history, and design at Iowa State University, the University of Technology-Sydney, Australia, the Bauhaus-Universität in Weimar, Germany, the Università di Bologna Alma Mater Studorium, and the McCormick School of Engineering at Northwestern University.