A QUICK METHOD OF MEASURING THE SURFACE TEXTURE OF AGGREGATE, WITH DISCUSSIONS AND CLOSURE

EXISTING METHODS OF MEASURING THE SURFACE TEXTURE OF AGGREGATES ARE REVIEWED AND SHOWN TO BE UNSATISFACTORY AS ROUTINE TESTS. THESE METHODS ARE: THE STYLUS METHOD, THE SPRING LOADED PROBE METHOD, WRIGHT'S METHOD OF CHORD LENGTHS, OPTICAL INTERFERENCE METHOD, ELECTRON MICROSCOPY, REFLECTOMETER, OUTFLOW METER TO MEASURE MEAN HYDRAULIC RADIUS. FIVE METHODS OF CHARACTERIZING SURFACE GEOMETRY ARE COMPARED. BASED ON THESE CONSIDERATIONS, A STYLUS APPARATUS THAT CIRCUMVENTS THE PROBLEM OF MEASUREMENT SENSITIVITY WAS DEVELOPED AND TESTED. THE APPARATUS WAS USED TO COMPARE THE SURFACE TEXTURE, AS INDICATED BY THE RATIO OF PROFILE LENGTH TO CENTER LINE LENGTH, WITH THE COEFFICIENT OF FRICTION OF ROAD STONES AS DETERMINED BY THE PENDULUM APPARATUS DEVISED BY RRL. THE HIGH CORRELATIONS OBTAINED SUGGEST THE UTILITY OF THE APPARATUS IN THE DESIGN OF CRUSHED ROCK ROAD BASES AND OF CEMENT AND BITUMINOUS CONCRETE MIXTURES. USE OF THE APPARATUS IN ASSESSING THE LIABILITY OF ROAD STONES TO POLISH IS ALSO SUGGESTED.

• Record URL:
  http://arrbknowledge.com
• Supplemental Notes:
  • PART 5
• Corporate Authors:

  ARRB

  Melbourne, Victoria  Australia 
• Authors:
  • Orchard, D F
  • Yandell, W O
  • Lye, B R
  • Marais, C P
  • Jamieson, I L
  • Dickinson, E J
• Conference:
  • Australian Road Research Board Conference Proc
• Publication Date: 1970

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 325-41
• Serial:
  • Volume: 5
  • Issue Number: Pt4

Subject/Index Terms

• TRT Terms: Aggregates; Aggregates by shape and surface texture; Coefficient of friction; Materials tests; Measuring instruments; Skid resistance tests; Texture
• Uncontrolled Terms: Aggregate shape; Aggregate testing
• Subject Areas: Geotechnology; Highways; Pavements;

Filing Info

• Accession Number: 00207443
• Record Type: Publication
• Files: TRIS
• Created Date: Aug 3 1972 12:00AM