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Secondary electron images of the fibre types before the fibre pullout tests. (a) Surface of the steel fibres. (b) Surface of the steel fibres after roughening. (c) Surface of the NiTi-fibres. (d) Surface of the NiTi-fibres after roughening. (e) Surface of the stainless-steel fibres. (f) Surface of the stainless-steel fibres after roughening.
