Grouting and pull-out tests of hollow-type prestressing-strands for an internal strengthening system

The present study focused on creation of an internal strengthening system, which involved embedding a post-tensioned PC tendon in a wedge-shaped anchorage of an existing concrete member. Under conditions with narrow work spaces, it was difficult to employ the previous system using a post-tensioned prestressing bar, as adequate backspace was required to install the bar. A flexible hollow corrugated pipe covered with steel wire cables seemed...