Title:
Ultrasonic Pulse Velocity in Concrete Using Direct and Indirect Transmission
Author(s):
Ismail Ozgur Yaman, Gokhan Inci, Nazli Yesiller, and Haluk M. Aktan
Publication:
Materials Journal
Volume:
98
Issue:
6
Appears on pages(s):
450-457
Keywords:
durability; pulse velocity; test; ultrasonic.
DOI:
10.14359/10843
Date:
11/1/2001
Abstract:
The relationship between velocities of ultrasonic stress waves transmitted along direct and indirect paths was investigated. Tests were conducted on plain concrete slabs of dimensions 1000 x 1500 mm, with a thickness of 250 mm. Direct ultrasonic wave transmission tests were conducted between top and bottom surfaces of the slabs and indirect tests were conducted along the slab surface. A test procedure, described in BS 1881 to determine indirect wave velocities, was refined by defining the number and spacing of transducers. Comparisons were made between direct and indirect wave velocity measurements using statistical analysis. The statistical analysis revealed that direct and indirect wave velocities could be used interchangeably in evaluating the properties of the concrete. The minimum number of test points required for a reliable estimate of indirect wave velocity was studied and recommendations are provided.