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Goin’ Underground completed by December 2013 before cold and chosen solution was a wicking product to divert the wet weather became an issue. flow away from the shotcrete during placement. One complication encountered throughout the MSD was pleased with the end result and project was the control of water—not the flow satisfied that they obtained a liner that would last inside the sewer pipe itself, but the seepage of for many years to come (Fig. 7). They were also groundwater through the invert. Due to the age of happy that the roadways were left undisturbed, the the sewer and the brick composition, the grout traveling public was detoured in only a few areas, between the bricks was deteriorated (or missing!) and the aboveground site conditions were restored in many sections, allowing a steady stream of to conditions better than they were prior to the start groundwater to infiltrate the system. This was not of the project. The largest benefit to MSD was the discovered until a complete bypass system was savings they gained by choosing shotcrete over established to handle the internal flow of water. another lining system. Coastal Gunite was happy Because shotcrete cannot be successfully to learn that the city of Muncie, IN, will consider installed on top of running water, Coastal Gunite the use of shotcrete to rehabilitate more of their had to determine how to prevent/control the external aging sewers in the future and tell other munic- infiltration of water into the pipe system’s invert. ipalities about their positive experience. Solutions considered included external grouting, wellpointing, and diversion. In this instance, the Randle Emmrich is Vice Pres- ident and Project Manager for Coastal Gunite Construction Co., Bradenton, FL. She received her BS in civil engineering from Bucknell University in May 1996. In her 18 years in the shotcrete business, she has overseen many projects, including the rehabilitation of bridges, piers, manholes, aqueducts, and sewers. Her projects have served various clients, including the U.S. Army Corps of Engineers, ESSO Inter- America, Maryland Transportation Authority, Virginia Department of Transportation, the City of Atlanta, and the City of Indianapolis. Emmrich is a member of ASCE; Chair of ACI Committee C660, Shotcrete Nozzleman Certification; and a member of ACI Committee 506, Shotcreting. Fig. 7: Finished shotcrete lining STRUCTURAL Did you know SHOTCRETE SYSTEMS, INC. ASA is on LICENSE #579272 A www.structuralshotcrete.com facebook? JASON E. WEINSTEIN, P.E. VICE PRESIDENT “like” us on facebook www.facebook.com/ 12645 CLARK STREET (562) 941-9916 AmericanShotcreteAssociation SANTA FE SPRINGS, CA 90670 FAX (562) 941-8098 42 Shotcrete • Spring 2015


2015SpringShotcreteEMag
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