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2013SprShotcreteEMag

Sustainability concrete that would have been used in a “form-and-pour” process repair, it would be hidden inside the form and require removal of would have a short open time to work with after driving to the site the form to correct. Shotcrete placement by an ACI certified from the batch plant. There would have also been risk of a form nozzleman could immediately follow the surface preparation of blowout and polluting the river and wetlands below the working the repair area by sandblasting or a high-pressure water blast of area. Shotcrete was also chosen for safety reasons. The air and the edge of the patch. The shotcrete process allows a visual water hoses going over the side offer considerably less risk than confirmation of full encapsulation of the reinforcing bars, while lowering and roughly handling lumber in the limited spaces casting into a closed form could result with voids that aren’t underneath the bridge deck. Also, if a problem occurred with apparent until the formwork is stripped. The curing of shotcrete concrete placement in the middle of casting the “form-and-cast” by use of wet cotton mats was superior compared to a form left in place because it provided supplemental water to the concrete for curing rather than depending on the original mixture water. Safety, time, quality, adaptability, and cost all significantly contributed to the use of shotcrete, which also resulted in a durable, affordable repair with enhanced sustainability benefits. Fig. 2: 50 x 6 ft (15 x 2 m) platforms used to perform work Fig. 3: 15,000 ft3 (425 m3) of removal and replacement Shotcrete • Spring 2013 43


2013SprShotcreteEMag
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