This final report presents research findings of an accelerated corrosion test program to determine the corrosivity of water-soluble sulfate ions in the simulated grout pore water and how these ions are present in various types of grout samples. The research product can enhance the bridge owners’ understanding of sulfate-induced corrosion in the grouted post-tensioned tendons and help their management of prestressed concrete bridges containing this type of tendons. This report is expected to be of interest to bridge program personnel from Federal, State, and local transportation departments as well as to parties engaged in bridge-related research.