NEW DEVELOPMENTS IN VIBRATION TECHNIQUES

THE PAPER DEALS WITH VIBRATION PHENOMENA IN A ROAD CONSTRUCTION. THE THEORIES, DEVELOPED BY JONES, ROAD RESEARCH LABORATORY, ENGLAND, ARE DISCUSSED, BOTH FOR THE CASE OF A SINGLE SLAB OF BOUND MATERIAL, AND FOR A COMPOUND SLAB, CONSISTING OF TWO LAYERS. HIS THEORIES COVER THE CASE OF NO FRICTION BETWEEN THE TWO LAYERS AND THE CASE OF NO SLIP. THE MEASURING TECHNIQUE IS ELUCIDATED AND THE MATHEMATICS APPLIED IN THE ANALYSIS OF VIBRATION PHENOMENA ARE DISCUSSED. EXPERIMENTS CARRIED OUT ON A SINGLE SLAB /E.G. CEMENT CONCRETE AND ASPHALT ON A GRANULAR BASE/ AND ON COMPOUND SLABS /ASPHALT ON LEAN CONCRETE, ASPHALT ON SAND CEMENT, ASPHALT ON BLAST FURNACE SLAG/ AND ASPHALTIC CONCRETE ON AN ASPHALTIC BASE ARE DISCUSSED. THE LATTER COVERS ONE CASE OF NO FRICTION /ASPHALTIC ON LEAN CONCRETE/, THE OTHER EXPERIMENTS REPRESENT CASES OF NO SLIP. MEANS TO CONTROL THE CORRECTNESS OF THE ANALYSIS OF THE VIBRATION MEASUREMENTS ARE DISCUSSED. TWO CLASSES OF MATERIALS ARE DISTINGUISHED, VIZ. HYDRAULICALLY BOUND MATERIALS /CEMENT BOUND MATERIAL, BLAST FURNACE SLAG/ AND BITUMEN BOUND MATERIALS. IT IS INDICATED THAT THE VALUE OF THE YOUNG'S MODULUS OF THE FIRST GROUP OF MATERIALS IS INDEPENDENT OF FREQUENCY, WHILE FOR THE SECOND GROUP THE RULES BY WHICH THE FREQUENCY INFLUENCES THE E-VALUE IS ELUCIDATED. FOR THE MATERIAL OF THE BITUMINOUS LAYER THE CONCENTRATION OF THE MINERAL AGGREGATE IN THE LAYER /CV/ IS USED AS A CRITERION. THE VALUE OF CV CAN BE DETERMINED FROM VIBRATION MEASUREMENTS AND FROM AN ANALYSIS OF THE MATERIAL A SECOND MEANS OF CONTROL BY COMPARING MEASURED AND CALCULATED R- VALUES /SPRING CONSTANT OF THE STRUCTURE/ IS DISCUSSED. THE PAPER GIVES A SURVEY OF VALUES OF THE YOUNG'S MODULUS OBTAINED IN THE FIELD ON HYDRAULICALLY BOUND MATERIALS AND THE VALUES OF CV ON BITUMINOUS BOUND MATERIALS AND POINTS TO SOME DISCREPANCIES FOR THE CEMENT BOUND MATERIAL. CALCULATIONS SHOW THAT FOR SOME EXISTING ROADS IN THE NETHERLANDS THE RADIAL STRESS AT THE BOTTOM OF THE SECOND LAYER WILL BE 80% HIGHER IN THE CASE OF NO FRICTION THAN IN THE CASE OF NO SLIP, DEMONSTRATING THE CONSTRUCTIONAL ADVANTAGES OF A NO SLIP CONSTRUCTION OVER NO FRICTION. THE INVESTIGATION HAS SHOWN THAT JONES THEORIES ARE FULLY CONFIRMED BY THE EXPERIMENTS. THE VIBRATION TECHNIQUE PERMITS DATA TO BE OBTAINED PHYSICAL PROPERTIES OF THE VARIOUS LAYERS OF A ROAD CONSTRUCTION IN SITU. /AUTHOR/

• Supplemental Notes:
  • Preprint VoL, PP 422-431, 13 FIG, 11 TAB, 7 REF
• Authors:
  • Nijboer, L W
• Conference:
  • Intl Conf Struct Design Asphalt Pvmts
• Publication Date: 1967-1

Subject/Index Terms

• TRT Terms: Binders; Bitumen; Bituminous pavements; Cement; Concentration (Chemistry); Field tests; Frequency (Electromagnetism); Measurement; Mechanical properties; Mineral aggregates; Modulus of elasticity; Pavements; Roads; Slabs; Theory; Vibration
• Uncontrolled Terms: Concentration
• Old TRIS Terms: Existing roads; Highway pavement; Insitu methods; Layered system mechanics
• Subject Areas: Highways; Pavements;

Filing Info

• Accession Number: 00206650
• Record Type: Publication
• Files: TRIS
• Created Date: Aug 1 1994 12:00AM