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Fig. 9: The finished product cially but also (and more importantly) remained specifications, while offering better adhesion and focused on finding the best solutions. I believe their more elasticity than originally specified. Were it role was instrumental in allowing both the contrac- not for their perseverance in obtaining the best tors and suppliers the means to find the best answers possible product, the shotcrete applied to the in a timely manner. I think a statement made by a bridge might have met the original project speci- member of Wildish Standard Paving sums it up best: fication but would not have been as durable over “Our shotcrete applicator was committed to the years. From the original mix, which produced achieving the very best mix design that could be a 10 to 30 psi (0.07 to 0.21 MPa) bond pulloff developed. From the original mixture, we reduced strength, we increased to getting over 300 psi the silica fume content; used other supplemental (2.1 MPa) with the final mix.” cementitious material, including fly ash and added I would add that it was really the commitment fiber; and a W. R. Grace retarder to slow the set- of all the parties to achieve the best quality and time. After developing eight different trial batches durability that allowed this to take place. for the project, they were able to identify a con- As a result of the efforts by many, including crete mix that exceeded the requirements of the Wildish Standard Paving, Johnson Western Gunite, CEMEX, and ODOT, the project team rehabilitated a beautiful historic landmark of the The Outstanding Repair & region in a safe and effective manner. Through Rehabilitation Project working together toward a mutually desired end goal, I believe we produced a durable, serviceable, Project Name and aesthetically pleasing project that will be The Oregon City Arch Bridge enjoyed by many generations to come. For infor- Project Location mation on the concrete mixture designs and Oregon City, OR specific test results, please contact ASA. Shotcrete Contractor Superior Gunite* General Contractor Marcus H. von der Hofen, Vice President of Coastal Gunite Wildish Standard Paving Construction, has nearly 2 Architect/Engineer decades of experience in the n/a shotcrete industry as both a Material Supplier/Manufacturer Project and Area Manager. He CEMEX, W. R. Grace & Co. is an active member of Ameri- can Concrete Institute (ACI) Project Owner Committees 506, Shotcreting, and C660, Shotcrete Oregon Department of Transportation Nozzleman Certification. He is a charter member *Corporate Member of the of ASA, joining in 1998, and currently serves as American Shotcrete Association Vice President to the ASA Executive Committee. Shotcrete • Winter 2014 29


2014WinShotcreteEMag
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