DISPERSION-FACTORS IN THE THICKNESS OF CARRIAGEWAY LAYERS

TO CONTROL THE THICKNESS OF CARRIAGEWAY LAYERS, A LIMITED NUMBER OF DESTRUCTIVE TESTS ARE CARRIED OUT, THE RESULTS OF WHICH ARE AFFECTED BY AN ACCIDENTAL ERROR DUE TO VARIOUS CAUSES OF DISPERSION. THESE CAUSES ARE IRREGULARITIES OF THE SURFACES DELIMITING THE LAYER STUDIED OR GEOMETRICAL FACTORS AFFECTING THE PARALLELISM OF THESE SURFACES. ANALYSIS OF THESE FACTORS SHOWS THE PRESENCE OF FOUR VARIABLES IN THE VARIANCE OF THICKNESS OF A LAYER. THE FIRST TWO VARIABLES ARE LOCAL UNDULATIONS IN THE SURFACES, THE THIRD IS LINKED WITH THE COVARIANCE OF THE UNDULATIONS, THE FOURTH TRANSLATES THE EFFECT OF THE NON-PARALLELISM OF THE SURFACES. THE NORMALITY OF THICKNESS DISTRIBUTION AND THE ACCURACY OF THE ANALYTICAL EXPRESSION OF VARIANCE WERE CONFIRMED BY MEANS OF THE STATISTICAL ANALYSIS OF 240 TOPOGRAPHICAL MEASUREMENTS CARRIED OUT BY THE C.R.R. IN 1963 ON ONE OF THE FIVE EXPERIMENTAL SECTIONS OF THE 223 R.N. THE RESULTS FROM THESE MEASUREMENTS CONCERNING THICKNESS OF SUB-BASE, OF BINDER AND OF ASPHALTIC CONCRETE ARE GIVEN FOR INFORMATION PURPOSES. THE AUTHOR CONCLUDES THAT THE REGULARITY OF THE THICKNESS OF A CARRIAGEWAY LAYER DEPENDS ONLY PARTLY ON THE CARE WITH WHICH THE LAYER WAS BUILT AND THAT THIS LAYER IS VERY SENSITIVE NOT ONLY TO THE EVENNESS OF SURFACE OF THE UNDERLYING LAYER BUT ALSO TO THE COVARIANCE OF UNDULATIONS IN THE TWO SURFACES AND TO THE LACK OF PARALLELISM WHICH CAN OCCUR BETWEEN THEM. /RRL/

  • Availability:
  • Supplemental Notes:
    • Vol 10, No 4, PP 1-20, 5 FIG, 6 TAB, 1 REF
  • Authors:
    • Ganse, R V
  • Publication Date: 1965-12

Media Info

  • Serial:
    • Technique Routiere
    • Publisher: Association Permanente des Congres Belges de Route
    • ISSN: 0040-1277

Subject/Index Terms

Filing Info

  • Accession Number: 00234539
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Jul 29 1994 12:00AM