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, Australian Centre for Geomechanics, Perth, pp. 585-596, https://doi.org/10.36487/ACG_rep/1304_40_Kaufmann
In tunnel and mining applications spraying of concrete is a well-established and economical alternative to conventional casting techniques. Further time and cost savings are achieved when fibre reinforced concrete is applied. Often steel fibres are used. Corrosion risk, damage of water impermeable films through the stiff fibres and a relatively high fibre rebound are some of the drawbacks of steel fibres.
A suitable alternative may be found in polymer based fibres. Such fibres were thought to bear other problems regarding the long-term application. Especially their performance under permanent load (creep), but also their behaviour in aggressive environment, has been questioned.
A recently developed polyolefin based bi-component fibre was investigated regarding its long-term behaviour. Pre-cracked fibre reinforced square panels were exposed to permanent load and different aqueous solutions (sodium chloride, sodium sulphate, sulphuric acid). Long-term deformation and residual load capacity were determined.
In these laboratory tests it could be demonstrated that for this type of structured plastic fibre neither creep nor the exposure to aggressive underground environments seems to be a limiting factor.
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