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Title: Acoustic nondestructive testing and measurement of tension for steel reinforcing members
Authors: McInerney, Michael K.
Brenner, Matthew W.
Morefield, Sean W.
Weber, R. (Robert)
Carlyle, John M.
Keywords: Nondestructive testing
Reinforced concrete
Hydraulic structures
Ultrasonic waves
Steel, Structural
Tensile architecture
Publisher: Construction Engineering Research Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical Report (Engineer Research and Development Center (U.S.)) ; no. ERDC/CERL TR-21-20
Abstract: Many concrete structures contain internal post-tensioned steel structural members that are subject to fracturing and corrosion. The major problem with conventional tension measurement techniques is that they use indirect and non-quantitative methods to determine whether there has been a loss of tension. This work developed an acoustics-based technology and method for making quantitative tension measurements of an embedded, tensioned steel member. The theory and model were verified in the laboratory using a variety of steel rods as test specimens. Field tests of the method were conducted at three Corps of Engineers dams. Measurements of the longitudinal and shear velocity were done on rods up to 50 ft long. Not all rods of this length were able to be measured and the quality and consistency of the signal varied. There were fewer problems measuring the longitudinal velocity than shear velocity. While the tension predictions worked in the laboratory tests, the tension could not be accurately calculated for any of the field sites because researchers could not obtain the longitudinal or shear velocities in an unstressed state, or precise measurements of the longitudinal and shear velocities due to the unknown precise length of the rods in the tensioned state.
Description: Technical Report
Gov't Doc #: ERDC/CERL TR-21-20
Rights: Approved for Public Release; Distribution is Unlimited
Appears in Collections:Technical Report

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