NDT.net - June 2001, Vol. 6 No. 6

A Portable Transient Elastic Wave System for In-situ Nondestructive Evaluation of Concrete

J.-H. Tong and T.-T. Wu
Institute of Applied Mechanics
National Taiwan University, Taipei, TAIWAN
E-mail: wutt@spring.iam.ntu.edu.tw



Principle of measurement

Fig 4: The surface responses recorded by S1 and S2. Fig 5: The influence of r1 on the Rayleigh wave velocity measurements.

Portable transient elastic wave system

Results and discussions




  1. "Standard Test Method for Pulse Velocity Through Concrete," ASTMC597-71 (1979).
  2. Ahmed E. Ben-Zeitun, "Use of Pulse Velocity to Predict Compressive Strength of Concrete," International Journal of Cement Composites and Light Weight Concrete, 8, No. 1, 51-59 (1986).
  3. N.J. Carino, M. Sansalone, and N.N. Hsu, "A Point Source-Point Receiver Pulse-Echo Technique for Flaw Detection in Concrete," ACI Journal, proceeding, 83, 199-208 (1986).
  4. N.J. Carino and M. Sansalone, "Detection of Voids in Grouted Ducts Using the Impact-Echo Method," ACI Materials Journal, 89, (3), 296-303 (1992).
  5. K.Y. Kim, W. Sachse, and A.G. Every, "On the Determination of Sound Speeds in Cubic Crystals and Isotropic Media Using a Broad Band Ultrasonic Point-Source/Point-Receiver Method," J. Acoust. Soc. Am., 93, 1393-1406 (1993).
  6. J.-F. Chai. and T.-T. Wu "Determinations of Anisotropic Elastic Constants Using Laser Generated Surface Waves," J. Acoust. Soc. Am., 95 (6), 3232-3241 (1994).
  7. T.-T. Wu, J.-S. Fang and P.-L. Liu "Detection of the Depth of a Surface-Breaking Crack Using Transient Elastic Waves," J. Acoust. Soc. Am., 97 (3), 1678-1686 (1995).
  8. T.-T. Wu, J.-S. Fang, G.-Y. Liu and M.-K. Kuo "Determination of Elastic Constants of a Concrete Specimen Using Transient Elastic Waves," J. Acoust. Soc. Am., 98 (4), 2142-2148 (1995).
  9. T.-T. Wu and J.-S. Fang "A New Method for Measuring Concrete Elastic Constants Using Horizontally Polarized Conical Transducers," J. Acoust. Soc. Am., 101 (1) (1997) 330-336.
  10. J.-H. Tong, T.-T. Wu and Lee, C.-K. (2000)"Application of a piezoelectric impact hammer to the in-situ nondestructive evaluation of concrete," submitted.

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