Adapted Actions Taken at Too Low Shotcrete Quality

by Jonas Holmgren, Royal Inst of Technology, Stockholm, Sweden,
Kjell Torsteinsrud, Royal Inst of Technology, Stockholm, Sweden,
Jan-Åke Åkesson, Royal Inst of Technology, Stockholm, Sweden,

Document Type: Proceeding Paper

Part of: Shotcrete for Underground Support VI


A tunnel contract specified quality parameters such as: thickness, compressive strength, adhesive strength, bending tensile strength and residual bending tensile strength for fibre reinforced shotcrete. The major part of the first 250 meters was not approved by the owner. The actions required were adapted to the actual rock situation at each section and also to the achieved quality of the shotcrete. The paper describes the analysis that led to the demands put to the contractor.

Subject Headings: Compressive strength | Strength of materials | Tensile strength | Shotcrete | Flexural strength | Fiber reinforced concrete | Tunnels | Contracts and subcontracts

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