ABSTRACT
Hydrated cement systems are used in the construction of a wide range of structures. During their service life, many of these structures are exposed to various types of chemical aggression involving sulfate ions. In most cases, the deterioration mechanisms involve the transport of fluids and/or dissolved chemical species within the pore structure of the material. This transport of matter (in saturated or unsaturated media) can either be due to a concentration gradient (diffusion), a pressure gradient (permeation), or capillary suction. In many cases, the durability of the material is controlled by its ability to act as a tight barrier that can effectively impede, or at least slow down the transport process.
