Influence of various compositional factors on the adhesive strength of concrete and fibre-concrete: (a) pull-off method, wetting the sample surface; (b) pull-off method, treating the sample surface with primer; (c) flexural strength method, wetting the sample surface; (d) flexural strength method, treating the sample surface with primer. A full-colour version of this figure can be found on the ICE Virtual Library (www.icevirtuallibrary.com)