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perception of the owner’s engineers was that When shotcrete is installed correctly it is as polymer­modified patching mortar would give durable as any other method of concrete repair. them a better job. After receiving our assurances, As I stated earlier, there are no secrets for doing they allowed us to repair the crest of the dam with good work. It takes skilled personnel, an experi- shotcrete. There were advantages to going with enced gunning crew, and proper placement tech- shotcrete. It was more efficient to transport the niques. In my mind, the best test of durability is material through the gunning hose to the repair the test of time. areas and we were able to gun the shotcrete to the full depth on sloped and vertical areas. In retro- spect, it was the right decision. The shotcrete Ted Sofis and his brother, Wil- performed better than the polymer-modified liam J. Sofis Jr., are the Principal patching mortar, and the shotcrete repairs have Owners of Sofis Company, Inc. held up well over the years. After graduating from Musk- ingum College, New Concord, The Carnegie Museum Slope OH, with his BA in 1975, Ted In 1988, we began placing shotcrete to stabilize began working full time as a the slope behind the Carnegie Museum in Pitts- shotcrete nozzleman and oper- burgh, PA. The museum needed additional ator servicing the steel industry. He began man- parking and the only land available was over the aging Sofis Company, Inc., in 1984 and has over hillside in Panther Hollow behind the museum 40 years of experience in the shotcrete industry. building complex. Because of the valley, a parking He is the Chair of the ASA Publications Committee, garage was designed to sit below the back of the and a member of multiple other ASA committees. museum and the parking structure was incorpo- Over the years, Sofis Company, Inc., has been rated into the hillside. We installed the dry-process involved in bridge, dam, and slope projects using shotcrete in sections with regular expansion joints shotcrete and refractory installations in power and screeded the shotcrete to fairly regular grade, plants and steel mills. Sofis Company, Inc., is a giving it a cut­down finish. With the passage of member of the Pittsburgh Section of the American time, the shotcrete remains in very good condition. Society of Highway Engineers (ASHE) and ASA. (a) (b) Fig. 5(a) and (b): (Before) In 1988, dry-process shotcrete was placed for slope stabilization on hillside behind Carnegie Museum in Pittsburgh, PA. Recesses were left for precast concrete to support a parking garage that was later built over the hillside (a) (b) Fig. 6 (a) and (b): (After) Dry-process shotcrete was used to stabilize slope for parking garage that was built into hillside behind Carnegie Museum in 1988. These photos of that work taken in February 2015 (27 years later) show that work remains in good condition. Sections of shotcrete slope can be seen on each level of parking garage 20 Shotcrete • Spring 2015


2015SpringShotcreteEMag
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