DISCUSSION OF REPORT OF COMMITTEE ON CHARACTER AND USE OF ROAD MATERIALS. II. BITUMINOUS MATERIALS

THE SUBJECT OF LABORATORY INVESTIGATIONS OF ASPHALT PAVING MIXTURES EMPHASIZE PAVEMENT CONSTRUCTION DETAILS, PARTICULARLY AS TO OBTAINING THE BEST PRACTICABLE COMPRESSION OF THE MIXTURE AND UNIFORMITY OF CONTOUR. THE IMPORTANCE IS EMPHASIZED OF CONTROLLING CONSTRUCTION DETAILS. FIELD TESTS SHOULD BE UNDERTAKEN TO SECURE DEFINITE DATA ON CONSTRUCTION DETAILS, PARTICULARLY ON COMPACTION. THE EFFICIENCY OF OPERATION CAN BE DETERMINED BY DENSITY TESTS ON SAMPLES OF THE PAVEMENT TAKEN DURING AND IMMEDIATELY AFTER COMPACTION BY DETERMINING: (1) RELATIVE EFFICIENCY OF A 10 TON 3-WHEEL ROLLER, A 10 TON TANDEM ROLLER, AND A 4 TOM TANDEM ROLLER OPERATING FOR A GIVEN PERIOD ON A GIVEN MIXTURE WITH A GIVEN INITIAL TEMPERATURE, (2) TIME EFFICIENCY OF A 10 TON 3-WHEEL AND A 10 TON TANDEM ROLLER OPERATED CONTINUOUSLY OVER A GIVEN MIXTURE WITH A GIVEN INITIAL TEMPERATURE, TESTS TO BE MADE AT REGULAR INTERVALS UNTIL THE MIXTURE HAS COOLED TO APPROXIMATELY ATMOSPHERIC TEMPERATURE, (3) EFFECTIVE TEMPERATURE OF MIX UPON EFFICIENTY OF ROLLING WITH A 10 TON 3-WHEEL ROLLER AND A 10 TON TANDEM ROLLER, ROLLING TO BE CONDUCTED FOR SPECIFIED INTERMITTANT PERIODS DURING COOLING AND (4) EFFICIENCY OF TAMPING ROLLER AS COMPARED WITH THE USUAL 3- WHEEL AND TANDEM ROLLERS ON THE SAME MIXTURE WITH DIFFERENT INITIAL TEMPERATURES. GENERAL USE IS SUGGESTED OF A SIMPLE CONTOUR TESTING DEVICE SUCH AS THAT ADOPTED BY THE OHIO STATE HIGHWAY COMMISSION AND KNOWN AS THE BUMPOMETER. DETAILED INFORMATION SHOULD BE SECURED RELATIVE TO THE MIXING OPERATION FOR DIFFERENT TYPES OF FINE AGGREGATE MIXTURES AS AFFECTED BY TEMPERATURE OF THE MIX, TIME OF MIXING AND SIZE OF BATCH FOR THE USUAL MIX OF A GIVEN RATED CAPACITY. IT APPEARS THAT SOME FINE SANDS WHICH ARE UNSATISFACTORY FOR USE WITH THE ORDINARY FILLER MAY BE MADE TO PRODUCE SATISFACTORY MIXTURES IF COMBINED WITH A MUCH FINER FILLER THAN HAS BEEN CUSTOMARILY USED.

  • Supplemental Notes:
    • Vol 6, pp 260-264
  • Discussers:
    • Hubbard, P
  • Publication Date: 1927

Media Info

  • Monograph Title: Proceedings of the Sixth Annual Meeting of the Highway Research Board Held at Washington, D.C., December 2-3, 1926
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00211527
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jul 2 1971 12:00AM