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  Creep behaviour of fibre reinforced sprayed concrete

  Fibre Reinforced Sprayed Concrete (FRSC) is commonly used for underground support. Various types of fibres are suitable to reach the usually required specifications on energy absorption. However the use of FRSC still raises questions. One of them is about the long-term behaviour under sustained flexural load (creep). ASQUAPRO launched specific tests on this subject in October 2014, using six different fibres and a welded mesh. The experimental program and the test procedure to assess creep are presented. The principle of this creep test is the same as the energy absorption capacity test, but on a longer run. Preliminary testing has been carried out on two types of sprayed concrete, one reinforced with metallic fibres and the other with polymeric fibres. This preliminary testing showed significantly different behaviours but no failure after one year of testing. The pre-cracking procedure appears to have a significant influence on the results. New, more restrictive, specifications on the energy absorption test are also discussed.

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