ROLE OF THE LABORATORY IN THE PRELIMINARY INVESTIGATION AND CONTROL OF MATERIALS FOR LOW COST BITUMINOUS PAVEMENTS

THE GRADING OF AGGREGATES MAY BE JUDGED BY SEVERAL UNRELATED CRITERIA SUCH AS ECONOMY, PERMEABILITY, WORKABILITY, SURFACE TEXTURE OF FINISHED PAVEMENTS, OIL DEMAND, AND STABILITY. GRADING CURVES, WITH TOLERANCE LIMITS WIDE ENOUGH FOR AVERAGE PLANT PRODUCTION, ARE GIVEN TO SHOW GRADINGS WHICH HAVE PROVEN SATISFACTORY. FORMULAS FOR DETERMINATION OF OIL CONTENT INVOLVE SURFACE AREA ANALYSIS. THE REPORT DESCRIBES A METHOD AND GIVES A TABLE OF SURFACE AREA CONSTANTS AND CURVES. THE SURFACE AREA IS MULTIPLIED BY THE BITUMEN INDEX TO GET THE AMOUNT OF OIL REQUIRED. A BITUMEN INDEX CHART IS SHOWN WITH CURVES WHICH APPLY FOR PARTICLE SURFACE TEXTURES WITH DIFFERENT DEGREES OF ROUGHNESS FROM GLASSY TO VESICULAR. A MACHINE HAS BEEN DIVISED TO TEST THE STABILITY OF BITUMINOUS MIXTURES. DEFORMATION OF THE SPECIMEN RESULTS IN PRESSURE ON A LIQUID. LABORATORY TESTS WITH THIS "STABILOMETER," HAVE BEEN CORRELATED WITH PAVEMENT SERVICE. FOR SUSCEPTIBILITY TO MOISTURE OF OIL ROADS, THE LABORATORY USES MODIFIED PROCEDURES OF METHODS DEVELOPED BY THE ARIZONA HIGHWAY TESTING LABORATORY. A WATER-ASPHALT PREFERENTIAL TEST HAS BEEN ADOPTED TO DETERMINE THE WATER-RESISTING PROPERTIES OF A FILLER TO BE USED IN A BITUMINOUS MIXTURE. A SWELL TEST IS USED TO DETERMINE THE EFFECT OF WATER ON OIL MIXES. THIS TEST IS CONSIDERED TO BE THE MOST RELIABLE FOR PREDICTING THE EFFECT OF WATER ON THE ROAD SURFACE. /AUTHOR/

  • Supplemental Notes:
    • Vol 14, ParT II, PP 14-54, 16 FIG, 7 TAB
  • Authors:
    • STANTON, T E
    • Hveem, F N
  • Publication Date: 1935

Media Info

  • Monograph Title: Proceedings of the Fourteenth Annual Meeting of the Highway Research Board Held at Washington, D.C. December 6-7, 1934. Part II: A Symposium on Research Features of Flexible-Type Bituminous Roads
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00217006
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 1971 12:00AM