corroded strands, except for strand CB4.2. The reason is that whenthe cementation action is destroyed, corrosion results in increasedfriction action and decreased screwing effect, and then the gear ac-tion plays the main role in the pull-out process, which results inthe bond strength increasing to a higher level than that of theuncorroded specimens. However, if the corrosion is too severe tomaintain sufficient gear action, the bond strength decreases to alower level than that of the uncorroded specimens.For corroded specimens, the wider the corrosion crack, theweaker the gear action, and so the bond strength decreases asthe corrosion crack as a whole increases.