A state-of-the-art report prepared by RILEM Technical Committee 116-PCD. At present, durability of concrete is controlled by specifying the materials to be used, the methods of mixing, placing, curing and so on. This approach is often unsatisfactory and it is a common objective of concrete researchers and engineers to develop performance criteria which allow the potential durability of a particular concrete mix or structure to be estimated. However, the complexity of concrete as a material and the difficulty of developing consistent and reliable test methods has meant that progress has been...