ASPHALT CONTENT DETERMINATION BY THE IGNITION METHOD

A METHOD FOR THE RAPID DETERMINATION OF ASPHALT CONTENT HAS BEEN DEVELOPED IN WHICH THE WEIGHT OF A SAMPLE BEFORE AND AFTER REMOVAL OF THE ASPHALT BY BURNING IS UTILIZED. VIRTUALLY COMPLETE COMBUSTION OF THE ASPHALT IS ACHIEVED BY SUBJECTING THE ASPHALTIC PAVING MIXTURE SAMPLE TO A VERY HIGH TEMPERATURE AND AN EXCESS OF OXYGEN IN A SPECIAL, BUT INEXPENSIVE, FURNACE USING OXYGEN AND BUTANE AS FUEL. THE TIME REQUIRED TO COMPLETE A TEST VARIES WITH THE SAMPLE SIZE, THE ASPHALT CONTENT OF THE MIXTURE, AND THE TEMPER- ATURE OF THE MIXTURE BEFORE BEGINNING THE TEST. THE TIME REQUIRED FOR ONE OPERATOR TO COMPLETE A TEST ON A 1000-GM SAMPLE IS APPROXIMATELY 25 MINUTES. THE IGNITION TEST EQUIPMENT CAN BE USED EQUALLY WELL IN THE FIELD OR THE LABORATORY AND IS SIMPLE TO OPERATE. RESULTS INDICATE THAT THE IGNITION METHOD CAN BE USED TO DETERMINE FROM SINGLE SAMPLES THE ASPHALT CONTENT OF HOT-MIX PAVING MIXTURES WITHIN PLUS OR MINUS 1/2 PERCENT AND WITHIN PLUS OR MINUS 1/4 PERCENT WHEN THE RESULTS FROM SEVERAL SAMPLES ARE AVERAGED. ONE ASPECT OF THE IGNITION METHOD IN ITS PRESENT CONCEPTION IS THAT PRELIMINARY CALIBRATION TESTS MUST BE PERFORMED TO ASSESS CORRECTION FACTORS FOR DIFFERENT OPERATORS AND AGGREGATE TYPES. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 76-86
  • Monograph Title: Bituminous materials and mixes
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00211438
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Sep 29 2000 12:00AM