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2016WinterShotcreteEMag

Fig. 4: Removal of deteriorated and delaminated concrete, installation of rock anchors and wire mesh, and ready for placement of dry-mix shotcrete process without having to return at a later time to complete the repair. 4. Less cleanup time allowed the contractor to maximize shooting time and improve productivity. Despite these benefits, dust control (preventing dust from contaminating the metro stations and ventilation system) remained the primary concern for the STM project managers. Before starting the shotcrete process, both flatbed cars were positioned side-by-side along parallel tracks and a platform connecting the two cars was installed to allow personnel to move between the cars. Another platform was erected to allow the nozzleman to position himself the proper distance from the receiving surface (approximately 3 to 5 ft 0.9 to 1.5 m). An adjustable netting system was designed and placed around the shooting platform to prevent rebound from falling into the track area and thus reducing cleanup time at the end of the shift (Fig. 4). The benefits offered through the dry-mix method of placement made it the natural choice for the contractor: 1. Sufficient pre-blended material to last a full shift could be transported, stored, and placed through the dry-mix gun, allowing the crew to maximize production. 2. The shotcrete crew could easily start and stop when moving from one repair area to the next. 3. A special high-early-strength, accelerated shotcrete mixture allowed the contractor to place thicker passes and complete the finishing Over 30 years of experience, nationwide service.... American Concrete Restorations, Inc. Amerconcrete@aol.com www.americanconcreterestorations.com Phone: 630-887-0670 Fax: 630-887-0440 Restoring America using the Shotcrete Solution Interstate 80 - Joliet, IL 32 Shotcrete • Winter 2016


2016WinterShotcreteEMag
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