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Sustainability face of the King’s Bluff Slope and Weehawken Tunnel East (181 m3) of material over a period of several weeks, while the Portal along the Hudson-Bergen Light Rail Transit Line (refer remainder of the crew handled the material delivery and equip- to Fig. 5). Shotcrete crews from Atlantic Underground Services ment operation at the base of the bluff. Ltd. (AUSL) of Riverview, NB, Canada, were contracted to Accessibility is a key factor when choosing which concrete place up to 4 in. (101 mm) of steel fiber-reinforced, dry-mix placement method is best suited for a specific application. On shotcrete over a rock face situated up to 200 ft (61 m) above projects where access is difficult, the traditional form-and-pour the rail line. In addition to being skilled in the art of dry-mix school of thought will often leave contractors with challenges shotcrete placement, the AUSL nozzlemen had also mastered that are difficult and costly to overcome. The benefits offered the skill of rappelling down rock faces (refer to Fig. 6). This by shotcrete will provide specifiers with an effective alternative skill allowed the AUSL nozzlemen to place over 236 yd3 that is less labor-intensive, more sustainable, and less costly. Fig. 4: Shotcrete was specified as the concrete placement Fig. 5: New Jersey Transit was faced with the challenge of method for the rehabilitation of the Haut-fond Prince stabilizing the rock face of the King’s Bluff Slope Lighthouse in the St. Lawrence River Fig. 6: In addition to being skilled in the art of dry-mix shotcrete placement, the AUSL nozzlemen had also mastered the skill of rappelling down rock faces Shotcrete • Summer 2013 63


2013SumShotcreteEMag
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