RILEM – Réunion Internationale des Laboratoires et Experts des Matériaux, systémes de construction et ouvrages – is an organisation with over 700 members whose aim is the worldwide bundling and transfer of scientific findings concerned with building materials, structures and buildings. A network of scientists and industry experts orientated towards building materials has developed in the meantime and collaborates in virtually all fields, from material science to non-destructive testing and from modelling to complex testing.