Application and Measurement of Prestress

The actual amount of prestressing force applied to a concrete member should be determined by measuring the tendon elongation, also by checking jack pressure on a calibrated gage or load cell, or by use of a calibrated dynamometer. If the discrepancy in force determination exceeds 5%, it should be investigated and corrected.
Elongation measurements should be correlated with average load-elongation curves for the particular prestressing steel being used.

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