STUDY OF BITUMINOUS PAVEMENTS IN NEW MEXICO USING THE GYRATORY TESTING MACHINE. GYRATORY TESTING OF PAVEMENT MATERIALS

THE MAIN OBJECTIVE OF THIS RESEARCH PROJECT WAS TO STUDY THE PLASTICITY, DENSITY, AND STRENGTH CHARACTERISTICS OF ASPHALT CONCRETE MIXTURES BY MEANS OF THE GYRATORY TESTING MACHINE. THE FIRST PHASE OF THIS PROJECT WAS DEVOTED TO THE CORRELATION OF THE RESULTS FROM THE GYRATORY MACHINE TO THE RESULTS OBTAINED USING THE STANDARD MARSHALL METHOD OF ASPHALTIC MIX DESIGN. ALSO INCLUDED IN THE FIRST PHASE OF STUDY WERE THE /1/ DEGRADATION OF AGGREGATES DUE TO KNEADING COMPACTION AS INDICATED BY THE SAND EQUIVALENT TEST, /2/ STRENGTH OR STABILITY OF ASPHALTIC MIXES AFTER IMMERSION IN WATER, AND /3/ CORRELATION OF DENSITY OF TRAFFIC-COMPACTED PAVEMENT TO THE DENSITY OBTAINED IN THE LABORATORY BY MEANS OF GYRATORY COMPACTION. THE SECOND PHASE OF THIS PROJECT WAS AN EXTENSION OF THE FIRST PHASE WITH RESPECT TO THE CORRELATION STUDY BETWEEN MARSHALL TEST RESULTS AND GYRATORY COMPACTION RESULTS. IN ADDITION, THE FOLLOWING STUDIES WERE CONDUCTED DURING THE SECOND PHASE' /1/ SHEAR STRENGTH OF ASPHALT CONCRETE MIXTURES OBTAINED WITH THE AIR-FILLED ROLLER ATTACHMENT ON THE GYRATORY TESTING MACHINE, /2/ THE EFFECT OF WATER IMMERSION ON SHEAR STRENGTH OF ASPHALT CONCRETE, /3/ AGGREGATE DEGRADATION OF A CALICHE-TYPE AGGREGATE, /4/ CORRELATION OF LABORATORY DENSITY AND FIELD DENSITY OF A NEWLY PLACED PAVEMENT BY MEANS OF AIR PERMEABILITY MEASUREMENTS, AND /5/ A CONTINUATION OF THE STUDY OF FIELD DENSITY OF A TRAFFIC-COMPACTED PAVEMENT WITH THE LABORATORY DENSITY OF A SIMILAR ASPHALT CONCRETE PREPARED IN THE LABORATORY. THE FOLLOWING GENERAL CONCLUSIONS HAVE BEEN REACHED FROM THESE STUDIES' /1/ THE GYRATORY TESTING MACHINE MAY BE USED FOR THE DESIGN OF AN ASPHALT CONCRETE MIX USING RECOMMENDED VALUES FOR COMPACTION PRESSURE, GYRATORY ANGLE, AND NUMBER OF LOAD REPETITIONS, /2/ THE GYRATORY TESTING MACHINE MAY BE USED AS A DEVICE FOR REPETITIVE LOADING OF ASPHALT CONCRETE SPECIMENS. DEGRADATION OF THE AGGREGATE WHICH OCCURS DURING REPETITIVE LOADING IS OBSERVED BY GRADATION ANALYSIS AND SAND EQUIVALENT VALUES, /3/ THE BEHAVIOR OF ASPHALT CONCRETE UNDER VARIOUS LOADING CONDITIONS MAY BE STUDIED BY COMPUTING SHEAR STRENGTH /GYRATORY STABILITY/ AND SHEAR MODULUS/ GYRATORY MODULUS/ VALUES FROM GYRATORY TEST RESULTS. DECREASE IN STRENGTH DUE TO DEGRADATION OF AGGREGATE MAY THUS BE OBSERVED DURING THE DESIGN PHASE. THE EFFECT OF MOISTURE ON ASPHALT CONCRETE MIXTURES MAY BE OBSERVED BY OBTAINING VALUES OF GYRATORY STABILITY AND GYRATORY MODULUS FOR MIXTURES THAT HAVE BEEN IMMERSED IN WATER PRIOR TO TESTING, AND /5/ A COMPARISON OF DENSITY VALUES OF TRAFFIC- COMPACTED SPECIMENS WITH THOSE OF LABORATORY-PREPARED SPECIMENS SHOWED THAT THE FIELD SPECIMENS WERE LESS DENSE THAN THE CORRESPONDING SPECIMENS PREPARED BY EITHER THE MARSHALL METHOD OR THE GYRATORY COMPACTION PROCEDURE. /AUTHOR/

  • Supplemental Notes:
    • Hpr-1/4/, BPR ITEM 4
  • Corporate Authors:

    University of New Mexico, Albuquerque

    1 University of New Mexico
    Albuquerque, NM  United States  87131

    Bureau of Public Roads /US

    400 7th Street, SW
    Washington, DC  United States  20590
  • Authors:
    • MARTINEZ, J E
    • Donham, B J
    • WANG, W L
  • Publication Date: 1965-2

Subject/Index Terms

Filing Info

  • Accession Number: 00210378
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Sep 15 1994 12:00AM