Relaxation losses of CFCC tendons
Figure 7 shows the prestress relaxation losses for CFCC
tendons recorded at 63% and 70% of the guaranteed cable
strength for different durations. The stress loss for the 63%
prestress after 57 days was about 0.7 kip (3 kN), or 2.7%
of the initial stress, which made the effective prestress at
the time of testing 62% of the guaranteed strength. The
stress loss after 15 days was 0.2% for the 70% stress. The
relaxation loss for CFCC tendons was found to be comparable
to that of low-relaxation steel tendons.