A NEW SONISCOPE- "THE ELASTISCOPE"

SONIC METHODS OF TESTING ALLOW THE APPROXIMATE ESTIMATION OF STRENGTH AND THE DETERMINATION OF CRACK DEPTHS WITHOUT CUTTING OR DAMAGING THE CONCRETE IN ANY WAY. UTILIZATION IS MADE OF THE BASIC PRINCIPLE THAT THE TONE OR FREQUENCY OF VIBRATION IS RELATED TO THE QUALITY, OR MORE PRECISELY, TO THE MODULUS OF ELASTICITY OF THE CONCRETE. THE SONIC MODULUS OF ELASTICITY IS CALCULATED BY MULTIPLYING THE SQUARE OF THE NATURAL FREQUENCY BY THE WEIGHT OF THE SPECIMEN AND BY A CONSTANT DEPENDING ON THE DIMENSIONS. THE FUNDAMENTAL TORSIONAL FREQUENCY CAN BE DETERMINED AND THE MODULUS OF RIGIDITY CALCULATED. KNOWING BOTH THE MODULUS OF ELASTICITY AND THE MODULUS OF RIGIDITY, POISSON'S RATIO CAN BE CALCULATED. THE CHANGE IN SONIC MODULUS OF ELASTICITY GIVES OF THE SPECIMEN. A NEW TYPE OF ELASTISCOPE DEVELOPED BY J. R. LESLIE AND W.J. CHEESMAN, UNIVERSITY OF WYOMING, IS DESCRIBED. MEASUREMENTS OVER DISTANCES AS GREAT AS 40 FEET HAVE BEEN MADE. IT IS USEFUL IN DETECTING CRACKS IN THE INTERIOR OF MASS CONCRETE. THE VELOCITY OF A SUPERSONIC WAVE CAN BE MEASURED THROUGH 1 TO 5 FEET OF CONCRETE. THE ELASTISCOPE IS USED ALONG WITH THE LABORATORY RESONANT FREQUENCY IN CHECKING CONTROLLED SPECIMENS AS THEY CHANGE IN PROPERTIES DURING CURING AND LATER AIR DRYING.

  • Supplemental Notes:
    • Vol 35, pp 418-423, 4 FIG, 1 TAB, 2 PHOT, 2 REF, 1 APP
  • Authors:
    • Lamb, D R
  • Publication Date: 1956

Media Info

  • Monograph Title: Proceedings of the Thirty-Fifth Annual Meeting of the Highway Research Board, Washington, D.C., January 17-20, 1956
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00213971
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 1971 12:00AM