Abstract: Tendon anchorages for aggressive environments. Tendon anchors according to the present invention include forward and rear connection means for fluid-resistant connection to adjacent members to protect the tendon strand from corrosive elements. A fixed anchorage according to the present invention includes a connector connected to the anchor plate rear connection means and the strand sheath in a fluid-resistant relationship and a cap threaded onto the anchor plate forward connection means to form a fluid-resistant connection after the strand has been tensioned. An intermediate anchorage according to the present invention replaces the cap with an adaptor which is threaded onto the anchor plate front connection means. The adaptor not only secures the anchor plate to the structure formed druing pouring of the structure, but also forms a fluid-resistant connection with a second connector which in turn forms a fluid-resistant connection with the strand sheath.