Presents the results of an experimental investigation addressing the variations in transfer lengths in two types of carbon fiber reinforced polymer (CFRP) prestressing strands. Parameters such as the level of prestress at release, creep, and the rate and method of release of prestress are considered. In all, eight double-T (DT) prestressed girders fabricated with high strength concrete were tested. Four DT girders were prestressed with CFRP Lead/me tendons while the other four DT girders were prestressed with carbon fiber composite cable (CFCC) strands. Based on the experimental results, a proposed modification in an available model for predicting the transfer length of CFRP Leadline tendons and CFCC strands is suggested. A comparison of results for the transfer length obtained using the proposed modification with those of others is made. It is shown that the calculated and measured transfer lengths are in close agreement with those obtained by others in the case of Leadline tendons only. It is also noted that the level of release of prestress has no significant effect on transfer length.
