Pre-stress evaluation error 4.93%
By exciting ultrasonic guided waves in the core wire, pre-stress evaluation is less affected by grouting thickness and length, with an error much lower than bare strands.
Zhang, Longguan · Jia, Junfeng · Bai, Yulei · Du X.L.
Construction and Building Materials 2025
Under core wire excitation, the evaluation error of αEL-based method for grouted strand is only 4.93%
Core wire excitation is significantly less affected by variations in grouting thickness and length compared with helical wire excitation