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2015WinterShotcreteEMag

2014 Honorable Mention Alameda Square By Paul Mendoza Atown Los Angeles, CA. This hub, built in Square and leasing the stylish and practical spaceFashion and Arts Districts. The owner, AtlasCapital Group, LLC, is revitalizing Alameda-lameda Square is an historical industrialcomplex in the Fashion District of Down the 1920s, will place a community of creative to several fashion tenants who are dedicated to companies at the intersection of the Los Angeles American clothing manufacturing. Alameda Square Building 3, constructed entirely with reinforced concrete, at one point in its history was used as a deep-freeze facility by a food packaging company which had insulated portions of the concrete slabs and beams with cork and clay tiles. The years of exposure to freezing-and-thawing conditions caused spalling on the interior beams, concrete joists, and slabs; spalling was also evident on the exterior archi- tectural concrete face of the building (refer to Fig. 1). The building was later repurposed as a garment manufacturing facility and still functions as such today. The objective of this rehabilitation was to chip out spalled and deleterious concrete, remove and repair corroded reinforcing bar, and restore these areas with new shotcrete to prevent potential safety hazards from further spalled concrete and return the building concrete structure back to its Fig. 1: An opened area showing the tile insulation and exposed existing original strength and function (refer to Fig. 2). reinforcing bar at the joists Several areas were identified as requiring rework and were repaired. The superior ability of shotcrete to bond in the overhead application made it a more viable alternative to typical cast- in-place concrete, an important factor to consider for structural rehabilitation of the building. By using shotcrete for the interior ceiling repairs, an added benefit for the tenant/owner was the ability to contain the area shutdown for construction to the floors with repairs, as opposed to cast-in-place that would have required shutting down com- mercial activity on additional floors because the work on a particular floor would require pumping concrete from the floor directly above the repairs. In addition, choosing shotcrete reduced construc- tion forming time and materials. Also, because shotcrete can be applied and finished more quickly, the project schedule was shortened. To complete the work, the owner shut down three floors of the warehouse building at a time. Once the shotcrete work was completed, they were able Fig. 2: This is a prepped area prior to shooting; sound existing reinforcing to immediately move in their tenants and then bar was left in place and reinforced with new reinforcing bar and dowels. shut down the next three floors above. Each day The edge form was set to bind the sides of the joist infill of downtime cost the owner productive revenue. 50 Shotcrete • Winter 2015


2015WinterShotcreteEMag
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