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Shotcrete Corner Fig. 5: Rapid-strength-gain dry-mix shotcrete modified with red pigment 5. In-place testing provided sufficient confi- dence to the mine to include this new product in the mining cycle. Since being Simon Reny, Eng., is Manager introduced into the mining process, the mine of Technical Services for King requested that a pigment be added for safety Packaged Materials Company reasons to differentiate where this mixture (an ASA Corporate Member), is used instead of their regular dry-mix where he is responsible for all shotcrete (refer to Fig. 5). mixture design development, Looking forward, the next steps are: quality control, and technical • To improve the formulation for higher support. He received his degree strengths at earlier ages, since the tech- in civil engineering from Laval University, nology provides sufficient evidence to Quebec City, QC, Canada, in 2004. He is a believe it is possible; member of the American Concrete Institute; an • To develop a formulation with different steel associate member of ACI Committee 506, Shot- fiber dosages and run the appropriate testing; creting; and a member of ACI Subcommittees and 506-C, Shotcreting-Guide, and 506-F, Shot- • The boiled absorption level must be monitored creting-Underground. He is also currently Presi- and investigated, to evaluate if the lower results dent of the International Concrete Repair are the nature of the new technology or result Institute’s Quebec Chapter. from poor compaction. William Clements, MASc., EIT, references sentative for King Packaged-is a Technical Services Repre 1. ACI Committee 506, “Guide to Shotcrete (ACI 506R- 05),” American Concrete Institute, Farmington Hills, MI, Materials Company. His areas 2005, 40 pp. of focus include cementitious 2. Heere, R., Morgan, D. R., “Determination of Early-Age material mixture design devel- Compressive Strength of Shotcrete,” Shotcrete magazine, V. 4, opment, structural rehabilita- No. 2, 2002, pp. 28-31. tion, and shotcrete technology. 3. Austin, S. A., Robins, P. J., “Sprayed Concrete : Properties, Design and Application,” Department of Civil & Building He received his bachelor’s and master’s degrees Engineering, Loughborough University of Technology, in civil engineering from the University of Loughborough, UK, 1995, 382 pp. Windsor, Windsor, ON, Canada. 30 Shotcrete • Fall 2013


2013FallShotcreteEMag
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