Current test methods that measure the electrical conductance or resistivity of concrete provide a rapid indication of concrete ability to resist chloride ion penetration. Although these methods do not provide a direct relationship to concrete water permeability, they have been widely accepted for assessing the durability of concrete. NCHRP Research Report 1086: Rating Concrete Water Permeability Based on Resistivity Measurements , from TRB’s National Cooperative Highway Research Program, presents a test …