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Fig. 9: Finish troweled curved wall, with post saw-cut architectural reveals Fig. 10: Rebound and waste shotcrete cast onsite into useable retaining wall and barrier blocks, further contributing to the sustainability of shotcrete From the offsite prefabrication and delivery stage right through to cleanup at the end of the project, structural shotcrete can increase sustainability and result in a more durable, longer life structure that requires less maintenance in the future. When you add the sustainability benefits of structural shotcrete to the significant cost savings and schedule advantages it creates, it’s not hard to see that structural shotcrete applications will continue to gain ground and truly represent a bright future for the construction industry. Ross King is Vice President of Business Development for Torrent Shotcrete Group in Toronto, ON, and Vancouver, BC, Canada. He has more than 40 years of experience as a Principal in the heavy concrete construction business. acceleration. As an additional bonus, fewer deliveries means less traffic congestion and in some cities, that equates to significant savings on lane closure fees associated with extended loading and unloading requirements. On remote sites, the reduction in transport time and lessened crane requirements also reduces project completion timing and transport costs. SHOTCRETE ADVANTAGES IN SPECIALTY APPLICATIONS With the combined savings achievable in materials, labor, and site logistics, structural shotcrete offers new forming opportunities not available or associated with two-sided form-and-pour methodology: • Shooting or finishing a wall from both sides with stayform or insulation in the middle; • Laminating over an existing structure that is tight to the floor and ceiling with no access from above to pour concrete into traditional two-sided forms; • Creating curved walls without the cost of building complicated two-sided curved formwork; • Easily creating tapered concrete sections that provide the exact concrete thickness where needed; • Creating shotcrete wall finishes similar to architectural floor finishes with color, stamping, carving, and offset facing not possible with traditional form liners; and • Hoisting or formwork moving challenges encountered in constricted spaces such as subways and tunnels are mitigated or eliminated when the form panel size and weight is reduced, or rendered unnecessary. ENVIRONMENTAL IMPACT— SUSTAINABILITY All areas of the construction industry are being impacted by increased pressure to contribute to more sustainable and environmentally friendly work processes—and rightly so. And while it’s a challenge for many segments of the industry, this increased awareness and subsequent demand represents another significant opportunity for structural shotcrete to position itself as a better application alternative and continue to grow and flourish. Wet-mix shotcrete placement creates a fresh concrete surface that can be a troweled, smoothly finished surface free of bug holes, lift lines, and form tie holes. The surface is denser and can be treated like an industrial floor. The result is a longer life cycle with added protection against freezing and thawing, chloride penetration, abrasion, and wear from environmental conditions. These characteristics enhance the overall sustainability of the shotcrete application methodology. Structures that last longer have less overall impact on the environment. Rebound and waste concrete can be turned into a usable retaining wall and barrier blocks. This recycling of waste into marketable by-products further contributes to the sustainability of structural shotcrete in a significant and tangible way. www.shotcrete.org Spring 2017 | Shotcrete 55


2017SpringShotcreteEMag
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