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The Construction Interlag Inc. management team worked closely with the experts from the material and equipment suppliers to convince the STM project managers that an experienced shotcrete crew, using well- maintained, quality equipment and a high-quality consistent material can easily alleviate concerns about dust. The Interlag team used a number of tools to minimize dust including a well-maintained dry-mix shotcrete rig (with a pre-dampening unit and gun). The pre-dampener added a controlled amount of moisture to the dry-mix prepackaged, preblended shotcrete material and a hydro-mix nozzle with a water ring approximately 10 ft (3 m) back from the nozzle tip was used to further reduce dust emissions (Fig. 5). Despite the effectiveness of these measures, a secondary dust control system that used a simple sprinkler/mist net system was installed Fig. 5: Proof that dry-mix shotcrete, placed in a confined location, can be relatively dust-free by using a well-maintained dry shotcrete rig (with a pre-dampening unit and gun) The Outstanding Repair & Rehabilitation Project Project Name Société de transport de Montréal— Metro Yellow Line Tunnel Repairs Project Location Montréal, QC, Canada Shotcrete Contractor Construction Interlag Inc. General Contractor Construction Interlag Inc. Architect/Engineer Société de transport de Montréal Material Supplier/Manufacturer King Shotcrete Solutions* Project Owner Société de transport de Montréal *Corporate Member of the American Shotcrete Association downwind from the shotcrete crew as added insurance against dust emissions. The Interlag crew proved that dry-mix shotcrete, placed in a confined location, can be relatively dust-free if the proper procedures are followed by an experienced team of professionals. A collaborative approach involving Construction Interlag Inc., the STM, and the material supplier (King Shotcrete Solutions) resulted in a successful project that was completed on budget, on time, and with limited inconvenience to the Montreal commuters. Kevin Robertson is a Technical Sales Representative for King Shotcrete Solutions and is responsible for the Greater Montreal Area and northeast U.S. markets. His area of expertise includes shotcrete materials, applications, and equipment, focused mainly on concrete repair and rehabilitation. Robertson is a member of ASA, the American Concrete Institute (ACI), and is the Vice-President of the Quebec Province Chapter of the International Concrete Repair Institute (ICRI). Patrick Giguère, P.Eng., is a Project Manager and Estimator for Construction Interlag Inc. His areas of expertise include structure and road rehabilitation. He has over 20 years of experience in the industry and received his degree in construction engineering from Écoles de Technologie Supérieur, Montréal, QC, Canada. Ntam Nda-Ngye, P.Eng., is a lead structural and civil engineer for the Société de transport de Montréal. His areas of expertise are project management, structural analysis, and design of steel and concrete structures. Ntam has over 15 years of experience in design and more than 5 years in project management. He was the project engineer on the Metro Yellow Line Tunnel Repairs project, for which he led a team of electrical, civil, and structural engineering specialists. He received his civil engineering degree from the University of Innsbruck, Innsbruck, Austria, and his master’s degree from École Polytechnique de Montréal, Montréal, QC, Canada. Shotcrete • Winter 2016 33


2016WinterShotcreteEMag
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