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2013WinShotcreteEMag

Fig. 4: Scaffolding setup for open access to underside of deck corrosion material in advance of any shotcrete concrete; minimum 1 in. (25 mm) concrete material. Access to the pier underside and safe removal behind existing in-place reinforcing; support of all workers was a major problem for the complete corrosion removal at reinforcing; new duration of the project over salt water with wave steel placement; anchoring and lap spicing; anti- action around pilings, tidal fluctuation, afternoon corrosion coating; and constant measuring of storms, and constant prevailing winds. Once the shotcrete thickness, cover at reinforcement, 10-story hotel was demolished one floor at a time density, compression, and consolidation. Presoak- by a specialty demolition contractor, working plat- ing the properly prepared concrete substrate to forms 120 x 200 ft (37 x 61 m) were suspended and surface saturated dry (SSD) ensured a monolithic anchored 7 ft (2.1 m) below the pier deck and at integrated bond line between enhanced existing concrete columns. Betco Scaffold of micro-silica shotcrete pneumatically applied Houston designed, engineered, erected, and sequen- freeform using three C-10 dry-mix shotcrete tially moved multiple sections to designated work machines purchased from Gunite Supply and zones, beginning at the farthest point over water Equipment in Houston, TX. Once each underside allowing safe access for EDS to structurally restore structural member received the required shotcrete each pier element (refer to Fig. 4). Environmental thickness of material, the surface was struck and restrictions were in place throughout the project by finished to match dimensions of the existing pier the city of Galveston, the U.S. Coast Guard, and the concrete. The on-site inspector monitored the Environmental Protection Agency (EPA) for shooting of test panels on a daily basis in concrete demolition dust control, debris removal, accordance with material specifications accepted and cementitious overspray during shotcrete place- by the engineer and owner. ment. Large tarps, screens, netting, tethers, and So life moves in a circular pattern, from tie-offs were present each day as workers restored Pleasure Pier to hotel to Pleasure Pier…truly historic. each platform section in a predetermined repair sequence to completion (refer to Fig 5). About Epoxy Design Systems, Inc. The on-site engineer inspected for sufficient The company, established in 1977, is a spe- removal of deteriorated/micro-fractured concrete; cialty trade contractor that repairs, protects, and surface profile of mechanically prepared sound strengthens existing concrete structures in domes- 44 Shotcrete • Winter 2013


2013WinShotcreteEMag
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