Abstract
Improved anti-corrosion anchors have been used since ground anchor (hereinafter anchors) standards were revised in 1978 by the Japanese Committee of Soil Mechanics and Foundation Engineering (current Japanese Geotechnical Society). But tension members used for anchors constructed before the revision are vulnerable to corrosion. It is, therefore, necessary to place priority on maintenance of these anchors. A large portion of the anchor is embedded underground, and it is difficult to directly confirm corrosion and deformation of the tension member. In this study we have conducted lift-off tests on and dug up anchors that are around 35 years old to investigate the situation, and proposed points to keep in mind when evaluating the soundness of corroded anchors.
