PRE-STRESSED CONCRETE REINFORCEMENT

Pre-tensioning tendon

Post-tensioning tendon

Pre-tensioning tendon

CFCCs used as pre-tensioning tendon are 7 strands or uni-strand cables.
CFCC can be stressed as same as ordinal PC steel strands cable by means of connecting a PC strands cable of about the same diameter of CFCC and CFCC cut into the desired length through a specific coupler.
(Refer to the drawing and the girder manufacsturing procedure shown below.)

Manufacturing procedure of the girder

1.Installing CFCC, and coupling with PC steel strands cable

2.Pre-loading and final loading of CFCC

3.Distribution and binding of stirrups

4.Placing formwork, pouring concrete and curing

5.Displacement of formwork and transfer of stress to the concrete girder

In regard to design and installation of pre-stressed concrete using CFCC, please refer to "Recommendation for Design and Construction of Concrete Structures using Continuous Fiber Reinforcing Materials" issued by Japan Society of Civil Engineers (JSCE)

Post-tensioning tendon

CFCC is cut into the designated length and terminal fixers are attached on the both ends at the CFCC plant in Japan. CFCC post-tensioning tendons are shipped after the fabrication and delivered to each job site. CFCC post-tensioning tendons are stressed with a center-hall hydraulic jack, a jack chair, and a tension bar, etc. (Refer to the drawing shown below.)