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concrete, it offers all of the sustainability benefits of concrete as a building material in addition to a long list of advantages that are unique to the shotcrete method of placement.3 In conclusion, the project was successfully completed while reporting zero accidents. All construction on the project was completed while over 200,000 vehicles a day traveled on the bridge above. Carl Akeley, a taxidermist by trade, would be proud that 101 years after his patent of the “cement gun,” developed in Chicago at the Field Museum of Natural History, Chicago still benefits from his innovation. The shotcrete solution resulted in a durable and cost-effective repair that will significantly extend the life of the original concrete structure. CDOT was impressed that the project stayed on schedule. All the contractors involved contributed to the success and the Festival of Lights parade went on as planned! references Fig. 3: Nozzleman shooting on the scissor lift Chicago, IL, 2012, http://thebuckinghamchicago.com/event/1. “Magnificent Mile Lights Festival,” The Buckingham, between the temporary shoring magnificent-mile-lights-festival. (last accessed March 20, 2013) 2. “Rehabilitation of Lake Shore Drive On-Ramp at Michigan all the challenges. While ACR used American Avenue and Oak Street to Begin October 1st,” City of Chicago, Concrete Institute (ACI) certified nozzlemen, the depts/cdot/provdrs/bridge/news/2012/sep/rehabilitation_Chicago, IL, 2012, http://www.cityofchicago.org/city/en/ entire shotcrete team—including the pump tender, oflakeshoredriveon-rampatmichiganavenueandoakstre.html. the finisher, and the grounds man, all of whom (last accessed March 20, 2013) have many years of experience in the shotcrete 3. “Sustainability,” American Shotcrete Association, operation—made the project a success. This Farmington Hills, MI, 2013, http://www.shotcrete.org/pages/ experience and qualification of the individuals why-shotcrete/sustainability.htm. (last accessed March 20, 2013) made the shotcrete process a successful and effi- cient team effort. Related Links While some DOT specifications have not yet History of Shotcrete adapted to shotcrete, the CDOT’s innovative en.wikipedia.org/wiki/Shotcrete#History specification wisely requires shotcrete for all overhead repairs. Shotcrete repairs on overhead American Concrete Restorations applications are far more cost-effective and struc- www.americanconcreterestorations.com turally efficient than formed concrete. Using shotcrete readily allows visual confirmation of the full encapsulation of the reinforcing bar and complete compaction of the shotcrete in place, Cathy Burkert received her whereas casting concrete into a closed, blind form bachelor’s degree in business often results in large voids. Workers using ready management and thereafter mixed concrete in a “form-and-pour” approach started working at American would have only had a little time to work with the Concrete Restorations, a Chi- concrete after it was transported from the concrete cago-based shotcrete con- batch plant to the site through downtown Chicago tractor. She joined the laborers’ traffic. Shotcrete also has enhanced safety benefits apprenticeship program to in the tight quarters of a project. The air and water learn the intricate details of the trade. After hoses for shotcrete offer considerably less risk 2 years in the program, she began running her than raising and roughly handling lumber over- own shotcrete crews and shortly after earned the head in the large underside area of the bridge deck. title of Field Office Coordinator. In March 2009, Furthermore, sustainability continues to grow Burkert became the first female ACI Certified as a driving force in the decision-making of Nozzleman for the wet-mix, vertical, and overhead owners and specifiers regarding construction processes. She has been involved with two award- materials and placement strategies. Shotcrete winning ASA infrastructure projects: the offers many significant sustainability advantages. Abraham Lincoln Memorial Bridge in 2008 and Because shotcrete is simply a method of placing the Dan Ryan Expressway in 2009. 12 Shotcrete • Spring 2013


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