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Periodic compressive strength testing using the ASTM C1604 method was conducted throughout the project. In addition, bond strength testing using ASTM C1583 was conducted to ensure that the shotcrete had a strong bond with the large exposed aggregates and especially on the large, relatively thin sections that had no wire mesh or a mechanical tie to the original structure concrete. SHOTCRETE MATERIALS Specifying a prepackaged, preblended dry-mix shotcrete provided the engineer with confidence that the quality control would be maintained throughout the project and the skill and expertise of the experienced ACI-certified nozzlemen, along with an experienced shotcrete team, ensured that the placement would be completed to meet the project specifications. Groupe Lefebvre (the concrete repair contractor) has been in the concrete repair, waterproofing, and shotcrete industries since its inception over 25 years ago. Groupe Lefebvre also brought on the team from Béton projeté MAH to help with the shotcrete portion. The management team of Béton projeté MAH Inc. has over 120 years of combined shotcrete placement experience. The dry-process mixture design chosen included silica fume to reduce the permeability of the concrete and to increase resistance to moisture and increase protection the reinforcement bars. Air entrainment was provided to help protect against damage from freezing-and-thawing cycling. Synthetic fibers were included to help minimize potential early-age plastic shrinkage cracking, especially because of the large surface area and some areas that had extremely deep repair thicknesses. Aggregate gradation No. 2 from ACI 506R with up to 3/8 in. (10 mm) stone was used to help with compaction and reduce the shrinkage 2016 OUTSTANDING INFRASTRUCTURE PROJECT Project Name Bordeaux Prison: Rehabilitation and Repair of the Perimeter Walls Project Location Montreal, QC, Canada Shotcrete Contractor Groupe Lefebvre M.R.P. Inc. & Béton projeté M.A.H., Inc. General Contractor Jessiko Inc. Architect/Engineer Héloise Thibodeau architecte Inc., Geniex (Engineer) Material Supplier/Manufacturer King Shotcrete Solutions* Project Owner Société québécoise des infrastructures *Corporate Member of the American Shotcrete Association Fig. 8: Dry-mix shotcrete equipment setup on trailer potential. The fact that the King MS-D1 SY was silica-fumeenhanced allowed the contractor to shoot thicker passes to accelerate the work to bring the repair back to the original surface dimensions. By doing so, they minimized the hours of security personnel required and shortened the closure of the courtyard. A total of seven-hundred-sixty-eight 2205 lb (1000 kg) bags were used on the project. Kevin Robertson is the Business Development Manager, U.S. Markets, for King Shotcrete Solutions. He began his career with King in 2007 as a Technical Sales Representative. Over the past decade, Robertson has played a key role in the growth of King’s concrete rehabilitation and tunneling business in Eastern Ontario, Quebec, and Northeast United States markets. His area of expertise includes shotcrete materials, applications, and equipment, focused mainly on concrete rehabilitation applications. Robertson is a member of ASA, the American Concrete Institute (ACI), and the International Concrete Repair Institute (ICRI), and has also served on the Board of Directors for the Quebec Chapter of ICRI, most recently as its Vice President. Pierre Brassard, Eng., is a graduate of construction engineering from L’École de Technologie Supérieure (ETS) in 1994. He spent nearly 12 years as team leader of the project management office (PMO) for major projects in Quebec and abroad for Hydro-Quebec. Since 2005, Brassard has been the President and Senior Engineer of the Quebec-based engineering firm he founded. Geniex Ingénierie specializes in structural and foundation design for residential, commercial, and industrial buildings. In mid-2015, he co-founded Geniex Construction Ingénierie, which provides a full design-build valueengineering service for the Montréal and regional areas. www.shotcrete.org Winter 2017 | Shotcrete 25


2017WinterShotcreteEMag
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