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    Surface support capabilities of freshly sprayed fibre reinforced concrete and safe re-entry time for underground excavations

    Access Status
    Fulltext not available
    Authors
    Saw, Hla Aye
    Villaescusa, Ernesto
    Windsor, Christopher
    Thompson, A.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Saw, H.A. and Villaescusa, E. and Windsor, C. and Thompson, A. 2017. Surface support capabilities of freshly sprayed fibre reinforced concrete and safe re-entry time for underground excavations. Tunnelling and Underground Space Technology. 64: pp. 34-42.
    Source Title
    Tunnelling and Underground Space Technology
    DOI
    10.1016/j.tust.2017.01.005
    ISSN
    0886-7798
    School
    Western Australian School of Mines
    URI
    http://hdl.handle.net/20.500.11937/50915
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 Elsevier LtdSprayed fibre reinforced concrete support is an important component of modern ground support schemes used for stabilisation of underground excavations in rock. In particular, the safe re-entry time after fibre reinforced concrete has been sprayed needs to be considered as it influences the productivity associated with development rates. It is proposed here that the shear strength of the sprayed fibre reinforced concrete matrix is a better parameter to consider than the Uniaxial Compressive Strength of the overall sprayed fibre reinforced concrete material including coarse aggregates. Consequently, a number of sprayed fibre reinforced concrete paste mixes were prepared and evaluated for strength gain. It was found generally that the shear strength of sprayed fibre reinforced concrete pastes increase exponentially during the first 4 h of curing in all sprayed fibre reinforced concrete mixes, except when the pastes included a hydration stabiliser. It was found for sprayed fibre reinforced concrete mixes with accelerator, synthetic fibres and aggregates that an average layer of about 50 mm thickness develops sufficient shear strength of about 20 kPa within about one hour to support the layer mass and a tetrahedral block with 1 m edge lengths. For the same sprayed fibre reinforced concrete layer, it was found that the sprayed fibre reinforced concrete layer and a cubic metre block can be supported within about 3 h and 50 min when the sprayed fibre reinforced concrete shear strength is estimated to be approximately 97 kPa.

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