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2017SummerShotcreteEMag

Fig. 6: Rankin Bridge pier repairs Photo by Dennis Bittner Fig. 7: Finished Rankin Bridge pier repair Photo by Dennis Bittner piling structure (refer to Fig. 6 and 7). Work on both projects was completed by Mosites Construction Co., Pittsburgh, PA. Amusement Park Volcano Kings Dominion amusement park in Doswell, VA, has a volcano that was constructed over 40 years ago, using 0.375 in. (10 mm) reinforcement and plaster lath, with 2 in. (50 mm) thick low-velocity sand and cement. The structure held up quite well until the last ride was built in and around the 100 ft (30 m) high volcano shell. This left holes where the pipe supports holding the track for the ride were placed. Special rubber boots were installed around the pipes before the placing of the new high-strength, silica fume shotcrete. However, freezing-and-thawing conditions triggered condensation around the supports, causing some of the steel reinforcement to rust. The areas marked for repair (refer to Fig. 8 through 10) require a 0.375 in. (10 mm) V-groove stay-in-place form, No. 3 (No. 10M) bar reinforcement spaced at 12 in. (300 mm) Fig. 8: The Kings Dominion amusement park volcano was divided into eight work zones for budgeting Photo by Ray Schallom Fig. 9: The 0.375 in. (9.5 mm) V-shape lath, the rubber boot around the pipe support, and reinforcement to be encased into the silica-fume shotcrete Photo by Ray Schallom on center, and 2 in. (50 mm) thick high-strength, silica fume concrete mixture with a migrating corrosion inhibitor for corrosion control. Staining (for aesthetic purposes) and waterproofing are applied once the strength requirement is met. The entire work zone is covered and heated during repairs, which can only be conducted from October 31 to March 15 while the park is closed for the season. The scaffolding and protection is removed prior to the park’s opening day. 14 Shotcrete | Summer 2017 www.shotcrete.org


2017SummerShotcreteEMag
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