Interfaces in cementitious composites : proceedings of the international conference held by RILEM (the International Union of Testing and Research Laboratories for Materials and Construction) at the Université Paul Sabatier, Toulouse, and organised by RILEM Technical Committee 108 and the Laboratory for Materials and Durability of Constructions (LMDC), INSA-UPS, Toulouse, France : Toulouse, October 21-23, 1992