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3 to 12 in. (178 to 305 mm) thick depending size, the exterior façade repair required three on the extent of the concrete that was chipped aerial man lifts to provide access for the ACI away and replaced. This is a six-story building Certified Shotcrete Nozzlemen and finishers plus a basement with floor-to-ceiling heights of (refer to Fig. 5 and 6). 12 ft (3.6 m). For the stairwells, Nationwide Along with the benefits of speed and ease of Shotcrete, Inc., ran steel pipe and concrete hoses overhead application, the use of shotcrete to each level and had scaffolding on each of the increased the sustainability of the project. The landings in the stairwell to allow for full access concrete mixture designs for the wet-mix shot- to all of the spalled areas. Due to the building crete used a combination of silica fume and fly ash, which are recycled cementitious replacement materials. Shotcrete application also requires less formwork than the traditional cast-in-place con- crete application, minimizing the total formwork material used for the project as well as reducing the time to place and strip the formwork. Reducing the amount of raw materials used and sourcing recycled materials for the mixture designs made the use of shotcrete over cast-in- place methods both an environmentally minded and cost-effective decision (refer to Fig. 7). Paul Mendoza is an Estimator/ Project Manager at Nationwide Shotcrete, Inc. He has 7 years of experience in the shotcrete industry, working for shotcrete and concrete contractors in Fig. 6: The exterior façade during the shoot—several aerial man lifts southern and northern Cali- were needed to properly reach the work spread over a wide area. This fornia. He is working toward area was given a rubber float finish his BS in civil engineering and is certified as an Engineer-In-Training in California. Honorable Mention Project Name Alameda Square Building 3 Project Location Los Angeles, CA Shotcrete Contractor Nationwide Shotcrete, Inc.* Concrete Contractor Wallock & Maggio, Inc. General Contractor Nemo Constructors, Inc. Architect/Engineer Farooq Maniar, Inc., Consulting Structural Engineers Material Supplier/Manufacturer National Ready Mixed Concrete Company Project Owner Atlas Capital Group, LLC *Corporate Member of the American Shotcrete Association Fig. 7: The exterior façade after shotcrete operations were completed 52 Shotcrete • Winter 2015


2015WinterShotcreteEMag
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