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2017SummerShotcreteEMag

Fig. 10: Volcano Zone 2 repair was quite extensive Photo by Ray Schallom The project specification called for one or two migrating corrosion inhibitors to be added to the shotcrete, depending on whether a dry, bagged mix or a ready mixed product was used. When the winning contractor, Cemrock, chose the wet-mix process, its ready mix supplier chose a CNI-based corrosion inhibiting admixture that prevented the hardened shotcrete from reaching the specified strength. Once the ready mix producer removed the CNI from the design mixture and began adding an amine-carboxylate-based migrating corrosion inhibitor into the mixture at 1.5 pints/yd (0.62 L/m3), the strength requirement started to be met on every load. In Fig. 11, the new lightly stained repaired zones and the old dark weathered zones yet to be repaired and stained are visible. Money budgeted annually includes the scaffolding erection and dismantling, the plastic protection, and the heating of the repaired areas as shown in Fig. 12. All work begins October 31 and must be cleaned up by March 15. This is an ongoing project until completed (Fig. 13). JC Century Building The JC Century Building in Binghamton, NY, is undergoing a mass renovation and repurposing to convert an old factory into an apartment complex. The architect has specified that the repairs to the structure must maintain the old construction appearance, such as exposed brick, arched concrete ceilings that look like they have been plastered, and new windows with the same look as the old factory windows. It was determined early on that hand-applying Fig. 11: Arial view of the finished stained Kings Dominion amusement park mountain in Zone 2 and Zone 3 2016-2017 season photo by Chris Alburger Fig. 12: Scaffold and the plastic protection over the mountain areas to be repaired Photo by Ray Schallom Fig. 13: Volcano finished stained area in Zone 3 Photo by Jeff Reichart www.shotcrete.org Summer 2017 | Shotcrete 15


2017SummerShotcreteEMag
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