1. Meyer, A., ‘The importance of the surface layer for the durability of concrete structures’, in ‘SP-100: Concrete Durability, Katharine and Bryant Mather International Conference.-Vol. I’, Atlanta, Georgia, USA, 1987 (American Concrete Institute), 49–61.
2. Torrent, R.J. and Frenzer, G., ‘A method for the rapid determination of the coefficient of permeability of the “covercrete”’, in ‘International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE)’, Berlin, Germany, 1995 (Deutsche Gesellschaft für Zerstörungsfreie Prüfung e.V.) 985–992.
3. Andrade, C., Gonzales-Gasca, C. and Torrent, R.J., ‘Suitability of Torrent Perameability Tester to measure air-permeability of covercrete’, in ‘Durability of Concrete’. Barcelona, Spain, 2000 (ACI international) 301–217.
4. RILEM-TC116-PCD, ‘Permeability, of concrete as a criterion of its durability. Final report TC 116-PCD: Concrete durability—An approach towards performance testing’,Mater. Struct. 32 (1999) 163–173.
5. Paulmann, K. and Molin, C., ‘On-site test methods’, in ‘RILEM Report 12: Performance Criteria for Concrete Durability’, Eds. Kropp, J. and Hilsdorf, H.K. (E & FN Spon, London, 1995) 258–279.