SURFACE WAVE METHOD

THE SURFACE WAVE METHOD IS BEING DEVELOPED AS A NON- DESTRUCTIVE MEANS OF MEASURING THE ELASTIC PROPERTIES, AND WHERE POSSIBLE, THE THICKNESS, OF THE VARIOUS LAYERS OF A ROAD. CONTINUOUS VIBRATIONS ARE GENERATED AT THE ROAD SURFACE, AND MEASUREMENTS ARE MADE OF THE WAVELENGTHS AND VELOCITY OF THE WAVES WHICH TRAVEL ALONG THE ROAD SURFACE. THE MEASUREMENTS ARE USUALLY MADE AT A NUMBER OF SPECIFIC FREQUENCIES TO DERIVE THE EXPERIMENTAL DISPERSION CURVE, I.E., RELATION BETWEEN THE MEASURED VELOCITY AND WAVELENGTH, WHICH IS SUBSEQUENTLY ANALYZED TO OBTAIN THE REQUIRED INFORMATION. WORK IN PROGRESS AT THE ROAD RESEARCH LABORATORY, ENGLAND, ON SOME ASPECTS OF THE METHOD IS DESCRIBED. THE EXPERIMENTAL TECHNIQUE EMPLOYS FREQUENCIES WITHIN THE RANGE OF 25 C/S TO 30,000 C/S AND EMPHASIS IS PLACED UPON MANUAL AND COMPUTER AIDS USED TO DERIVE THE EXPERIMENTAL DISPERSION CURVES FROM THE INITIAL DATA. RECENT WORK ON THE BASIC THEORY INDICATES HOW THEORETICAL DISPERSION CURVES CAN BE CALCULATED FOR MOST TYPES OF ROAD STRUCTURE. TO PROVIDE AN ADEQUATE CHECK ON THE THEORY, MODELS OF ROADS ARE BEING TESTED. USING THE SURFACE WAVE METHOD, THE THICKNESS, ELASTIC PROPERTIES AND STRENGTH PROPERTIES OF CONCRETE AND CEMENT-BOUND LAYERS HAVE BEEN DERIVED, AND A MODIFIED TECHNIQUE USING ONE FREQUENCY ONLY HAS BEEN DEVELOPED FOR STUDYING VARIATIONS OF QUALITY OF CEMENTED ROAD LAYERS.

• Supplemental Notes:
  • Preprint, pP 404-421, 12 FIG, 5 TAB, 3 PHOT, 23 REF
• Authors:
  • Jones, R
  • Thrower, E N
  • Gatfield, E N
• Conference:
  • Intl Conf Struct Design Asphalt Pvmts
• Publication Date: 1967-8

Subject/Index Terms

• TRT Terms: Base course (Pavements); Cement treated soils; Elastic analysis; Elasticity (Mechanics); Nondestructive tests; Pavements; Strength of materials; Thickness; Vibrometers; Wave motion; Wavelength
• Uncontrolled Terms: Cement treated bases; Pavement thickness
• Old TRIS Terms: Elastic analysis (Structural); Highway pavement; Layered system mechanics
• Subject Areas: Geotechnology; Highways; Pavements;

Filing Info

• Accession Number: 00206717
• Record Type: Publication
• Files: TRIS
• Created Date: May 13 1994 12:00AM