STUDIES ON THE EFFECT OF MINUS 200 MESH MATERIALS ON THE USEFULNESS OF CERTAIN BITUMINOUS CONCRETE AGGREGATES

THIS RESEARCH PROJECT WAS UNDERTAKEN IN AN ATTEMPT TO DETERMINE IF CERTAIN NATURAL SANDS IN NORTH CAROLINA WERE SUITABLE FOR USE IN BITUMINOUS MIXTURES WITHOUT THE NECESSITY OF ADDING SEPARATE MINERAL FILLER AS REQUIRED BY PRESENT PAVEMENT SPECIFICATIONS. THE INVESTIGATION WAS FOCUSED ON STUDYING THE PROPERTIES OF THE MINUS NO. 200 SIEVE MATERIAL CONTAINED IN LOCAL SANDS. THE PROPERTIES INVESTIGATED WERE /1/ SPECIFIC GRAVITY AS DETERMINED IN MEDIA OF WATER, VARSOL AND BENZENE, /2/ BULK VOLUME, /3/ ACTIVITY COEFFICIENT - RATIO OF BULK VOLUME TO SOLID VOLUME, /4/ ADSORPTION - WITH VARIABLES OF DRYING TEMPERATURE, DRYING TIME, ADSORBATES /WATER AND NO. 2 FUEL OIL/ AND ADSORPTION TIME, AND /5/ X-RAY DIFFRACTION ANALYSIS. CORRELATION OF THESE MATERIAL CHARACTERISTICS WITH BITUMINOUS MIXTURE PROPERTIES WAS NOT ATTEMPTED. ACTIVITY COEFFICIENT VALUES RANGED FROM 2.31 TO 6.02 FOR 12 MATERIALS TESTED. DATA ON THE RESULTS OF THE WATER ADSORPTION TESTS ARE PRESENTED FOR ONLY 3 OF THE AGGREGATES INVESTIGATED. THE TEST DATA FOR OIL ADSORPTION ARE NOT INCLUDED. IT WAS FOUND THAT WATER ADSORPTION INCREASED WITH INCREASED DRYING TEMPERATURE AND THAT DRYING TIME DID NOT APPEAR TO BE SIGNIFICANT. THE AUTHORS ANALYSIS OF X-RAY DIFFRACTION SPECTRA INDICATED NO APPRECIABLE CHANGE IN MATERIAL COMPOSITION AFTER DRYING AT 600 F. THE FINE AGGREGATES WERE ESSENTIALLY SILICA WITH MUSCOVITE MICA. THE PRINCIPLE CONCLUSION OF THE STUDY IS THAT THE MATERIALS INVESTIGATED DID NOT HAVE SIGNIFICANT DIFFERENCES IN THE INDEX PROPERTIES CHOSEN FOR STUDY. NO RECOMMENDATIONS ARE MADE REGARDING THE SUITABILITY OF THE FINE AGGREGATES INVESTIGATED FOR USE IN BITUMINOUS MIXTURES IN NORTH CAROLINA. /BPR/

• Supplemental Notes:
  • Hps-hpr-1/28/, BPR ITEM 15, STATE NO V
• Corporate Authors:

  North Carolina State University, Raleigh

  Raleigh, NC  United States  27695

  North Carolina State Highway and Public Works Commission

  P.O. Box 25201, 1 South Wilmington Street
  Raleigh, NC  United States  27611
• Authors:
  • Fisher, C P
• Publication Date: 1966-9

Subject/Index Terms

• TRT Terms: Adsorption; Asphalt concrete; Bituminous mixtures; Concrete aggregates; Diffraction; Drying; Fine aggregates; Fines (Materials); Sand; Specific gravity; Temperature; Time; Volume; X rays
• Uncontrolled Terms: Bulk; X-ray diffraction
• Geographic Terms: North Carolina
• Old TRIS Terms: Activity coefficient; Adsorbates; Drying temperature; Natural sand fine aggregate
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00210361
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Files: TRIS
• Created Date: Mar 20 1994 12:00AM