GEOMETRIC ROUGHNESS OF ROAD SURFACINGS -- SAND DEPTH MEASUREMENT /IN FRENCH/

THIS PROCEDURE WAS DEVELOPED BY THE LCPC AND APPROVED BY A MINISTERIAL CIRCULAR ON 22ND FEBRUARY 1971. THE SURFACE TEXTURE OF ROAD SURFACINGS, OR GEOMETRIC ROUGHNESS, IS NOT RELATED TO THE NATURE OF THE INGREDIENTS BUT TO THE SHAPE OF THE SURFACE ITSELF. IT IS POSSIBLE TO DISTINGUISH MACRO ROUGHNESS, MICRO ROUGHNESS, AND ANGULARITY, BUT IT IS EXTREMELY DIFFICULT TO CHARACTERIZE SURFACE CONDITIONS AND VERY OFTEN ONLY APPROXIMATE SOLUTIONS ARE OBTAINED. IN THE SAND DEPTH MEASUREMENT TEST, A KNOWN VOLUME OF SAND IS LEVELLED ON A CIRCULAR ZONE OF THE SURFACING. THE RATIO OF THE VOLUME USED TO THE COVERED SURFACE GIVES AN AVERAGE HEIGHT OF THE IRREGULARITIES, WHICH IS CALLED "AVERAGE SAND DEPTH". DETAILS ARE GIVEN OF THE EQUIPMENT, TEST PROCEDURE, AND PRESENTATION OF RESULTS. AN APPENDIX DESCRIBES TWO OTHER METHODS: PLOTTING OF A PROFILE CHART, AND MOULDING OF THE SURFACING. /TRRL/

  • Corporate Authors:

    Laboratoire Central des Ponts et Chausees (LCPC)

    Boulevard Lefebvre 58
    Paris Cedex 15,   France  F-75732
  • Publication Date: 1971

Media Info

  • Features: Figures; Photos; Tables;
  • Pagination: 23 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00206873
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: May 29 1973 12:00AM