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2013WinShotcreteEMag

Fig. 5: Column prepared for shotcrete application Fig. 7: New shotcrete surface to resemble 1932-formed rough-cut plank finish process but also in finishing it to emulate the original pattern left by the formwork used over 80 years before. To achieve this, RAM used a fabricated form board, which they pressed into the partially set concrete overhead, thus achiev- ing an effect that imitated and blended in with Fig. 6: Multiple layers of shotcrete prior to the pattern left by the original formwork. This finish coat “historical touch” was very successful through- out the entire concrete replacement and included those areas that had been previously repaired but were not restored to the original pattern and aesthetic (Fig. 6 and 7). With an average repair depth of 4 in. (102 mm), RAM used approximately 45 truck- loads of King shotcrete for the project, amounting to approximately 500 yd3 (380 m3). As Richard Maxwell, RAM’s Director of Operations, Res- toration Division, puts it, “The key to a suc- cessful shotcrete repair lies exclusively with your crew, of whom the most important indi- vidual is your nozzleman.” RAM uses the ser- vices of 15 ACI Certified Nozzlemen throughout their areas of operation. Having made shotcrete a core part of their restoration and rehabilitation division, they take the need to ensure that their personnel maintain certified status on an ongoing basis seriously. The SPUD parking structure rehabilitation required the services of four nozzlemen during RAM’s original contract. Steve Spindler, Project Foreman for RAM, was responsible for 95% of the shotcrete required on this project. He has at least 20-plus years of experience as an ACI Certified Nozzleman. SPUD was finished on time in September 2012. The extensive rehabilitation that RAM undertook to restore the underside of the train deck for the parking structure will significantly ease parking congestion around the depot. The entire structure will allow for an area of up to 250,000 ft2 (23,226 m2) devoted entirely to 26 Shotcrete • Winter 2013


2013WinShotcreteEMag
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