Permeability of High Reactivity Metakaolin (HRM) Concrete - Technical Bulletin

High Reactivity Metakaolin (HRM) is an engineered, high-strength, pozzolanic material. It is an economical alternative to silica fume and can be utilized in high performance concrete. Permeability is defined as the coefficient representing “the rate at which water is transmitted through a saturated specimen of concrete under an externally maintained hydraulic gradient.”1 Permeability is inversely linked to durability in that the lower the permeability, the higher the durability of concrete and, “the permeability of concrete to water and chloride is the major factor affecting the process of corrosion of embedded metals.”.