Steel Fibre Reinforced Wet Shotcrete with Very High Deformation Capacity

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by Bo Malmberg, Cembygg AB, Sollentuna, Sweden,

Document Type: Proceeding Paper

Part of: Shotcrete for Underground Support V

Abstract: Tests have been carried out under site conditions in Norway where the performance of 40 mm long DRAMIX fibres was compared with normally used 30 mm fibres. The fibres were mixed into the concrete at a ready mix factory and sprayed by a wet shotcrete equipment. The shotcreting was performed without any problems, though the use of relatively long fibres. The thoughness of the concrete with 40 mm long fibres was increased by 60-100% with, for instance, a distinct multiple cracking behavior when using 60 kg/m3 of the 40 mm long fibres. The excellent properties of the 40 mm fibres are supposed to depend on a combined effect of fibre length and fibre orientation.

Subject Headings: Steel fibers | Shotcrete | Deformation (mechanics) | Reinforcing steel | Material mechanics | Cracking | Mechanical properties | Materials processing | Europe | Norway

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