Prefabrication of Load Bearing Structures in Steel fiber Reinforced Shotcrete


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Title: Prefabrication of Load Bearing Structures in Steel fiber Reinforced Shotcrete

Author(s): H. Cederqvist

Publication: Special Publication

Volume: 105


Appears on pages(s): 367-374

Keywords: balconies; concrete products; fiber reinforced concretes; metal fibers; prefabrication; shotcrete; Manufacturing

Date: 12/1/1987

To manufacture load-bearing structures of thin-walled concrete, a new production method called EKEBRO fiber shotcrete was developed. The essential part in the technology is a patented spray gun. Steel wire (0.5 mm), concrete, and compressed air are fed into the spray gun. A cutting wheel cuts the wire into fibers of the required length and shoots these in a stabilized direction on the form or surface together with the concrete. Through this method, a good distribution of steel fibers in the product is achieved, and long fibers can be utilized. Spraying with a variating steel fiber content is also possible. The method is used presently in Sweden for the production of balconies for apartment buildings and, further, for the production of various other products. The technique is also used in traditional shotcreting work, such as repair of deteriorated structures.