
This test is done to assess the quality of concrete by ultrasonic pulse velocity method as per IS: 13311 (Part 1) 1992. The underlying principle of this test is - The method consists of measuring the time of travel of an ultrasonic pulse passing through the concrete being tested. Comparatively higher velocity is obtained when concrete quality is good in terms of density, uniformity, homogeneity etc. Procedure to determine strength of hardened concrete by Ultrasonic Pulse Velocity. i) Preparing for use: Before switching on the V meter, the transducers should be connected to the sockets marked TRAN and REC. The V meter may be operated with either: a) the internal battery, b) an external battery or c) the AC line. ii) Set reference: A reference bar is provided to check the instrument zero. The pulse time for the bar is engraved on it. Apply a smear of grease to the transducer faces before placing it on the opposite ends of the bar. Adjust the SET REF control until the reference bar transit time is obtained on the instrument read-out. iii) Range selection: For maximum accuracy, it is recommended that the 0.1 microsecond range be selected for path length upto 400mm. iv) Pulse velocity: Having determined the most suitable test points on the material to be tested, make careful measurement of the path length L. Apply couplant to the surfaces of the transducers and press it hard onto the surface of the material. Do not move the transducers while a reading is being taken, as this <b>...</b>
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agra
ndt test
upv test
concrete ndt testing
iso 17025
nabl
non destructive testing
ultrasonic pulse velocity
is 13311
culvert testing
Indian railways
rvnl
rdso
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rebound hammer
rebound number
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