240 Int. J. Materials and Product Technology, Vol. 23, Nos. 3/4, 2005 Copyright © 2005 Inderscience Enterprises Ltd. Process dependence of shotcrete for repairs Vivek Bindiganavile* Department of Civil and Environmental Engineering, University of Alberta, 3-020, Markin/CNRL-NREF Bldg., Edmonton, AB, T6G 2W2, Canada Fax: 780 492 0249 E-mail: vivek@ualberta.ca *Corresponding author Nemkumar Banthia Department of Civil Engineering, University of British Columbia, #2024-6250 Applied Science Lane, CEME Bldg., Vancouver, B.C. V6T 1Z4, Canada Fax: 604 822 6901 E-mail: banthia@civil.ubc.ca Abstract: In the study presented here, the authors illustrate that the properties of steel fibre reinforced shotcrete are a function of the manufacturing process. The paper examines the causes for the higher penetration resistance in dry-mix shotcrete, while highlighting the differences in composition and rebound during the fresh state. A strong influence of the spray process is witnessed on the hardened properties under both compression and flexure. For an identical fibre content, the toughness of shotcrete is noticeably different from that of the corresponding cast concrete. It is seen that the optimal post-crack performance is achieved via the wet process technique. Keywords: dry-process; flexural toughness; penetration resistance; rebound; shotcrete; steel fibre; wet-process. Reference to this paper should be made as follows: Bindiganavile, V. and Banthia, N. (2005) ‘Process dependence of shotcrete for repairs’, Int. J. Materials and Product Technology, Vol. 23, Nos. 3/4, pp.240–256. Biographical notes: Vivek Bindiganavile is an Assistant Professor at the University of Alberta, Canada. His research interests include fibre reinforced concrete and shotcrete, dynamic fracture mechanics, FRP reinforcement and structural health monitoring. He is a member of ACI Committee 544, Fibre Reinforced Concrete. Nemkumar Banthia is a Professor and Distinguished University Scholar at the University of British Columbia, Vancouver, Canada. He has authored/ coauthored over 250 technical papers, and holds three international patents. He chairs the American Concrete Institute (ACI) Committee on Fibre Reinforced Concrete, RILEM Committee on FRP-Concrete Bond and the Canadian Highway Bridge Design Code Committee on Durability. A fellow of the ACI, the Canadian Academy of Engineering and the Indian Concrete Institute, Dr. Banthia has received numerous awards and honors including the Wason Medal of the American Concrete Institute and the Solution Through Research Award of the Science Council of British Columbia.