STUDY OF PRACTICAL MEASUREMENTS OF AGGREGATE QUALITY

TEN TECHNIQUES WERE STUDIED IN A PRELIMINARY WAY TO ASSESS THEIR POSSIBILITIES FOR DEVELOPMENT OF A PRACTICAL AND ACCURATE METHOD FOR FIELD INSPECTION USE IN DETERMINING THE QUALITY OF GRAVEL AGGREGATE. SIX OF THESE WERE BASED ON POROSITY OR INVOLVED MEASUREMENT OF THE WATER CONTENT OF THE AGGREGATE IN THE SATURATED STATE. THESE TECHNIQUES INCLUDED CAPACITANCE, CONDUCTANCE, MICROWAVE ABSORPTION, NEUTRON MODERATION, WATER DESORPTION, AND NUCLEAR MAGNETIC RESONANCE (NMR). THE OTHER FOUR TECHNIQUES INVOLVED MEASUREMENTS OF REFLECTANCE, LUMINESCENCE, THERMAL SHOCK, AND SPECIFIC GRAVITY. THE AGGREGATE TYPES USED IN THE STUDY WERE THOSE VISUALLY IDENTIFIED AS GOOD, CHERT, HARD ABSORBENT (HA), AND SOFT AND NONDURABLE (SND). THE MEASUREMENT TECHNIQUES WERE APPLIED MOSTLY TO INDIVIDUAL PARTICLES, BUT SOME TESTS WERE MADE ON BULK SAMPLES OF MIXTURES OF THE AGGREGATE TYPES. THE TEST RESULTS ON BULK SAMPLES ALONG WITH CONSIDERATIONS OF THE VARYING CHARACTER OF THE GRAVELS INDICATED THAT A SINGLE MEASUREMENT MADE ON A BULK SAMPLE WOULD BE SUBJECT TO MISLEADING INTERPRETATIONS. HEAVY LIQUID SEPARATION SEEMS TO OFFER THE BEST POSSIBILITY FOR DEVELOPMENT OF A USEFUL AND RELIABLE FIELD INSPECTION METHOD FOR DETERMINING AGGREGATE QUALITY. THE TECHNIQUE PROBABLY COULD BE DEVELOPED TO HANDLE LARGE SAMPLES, AND THE EQUIPMENT SHOULD NOT BE EXPENSIVE NOR THE OPERATIONAL COST EXCESSIVE. FURTHER WORK IS RECOMMENDED TO DEVELOP THE TECHNIQUE AND TEST ITS USEFULNESS AND RELIABILITY IN THE SAMPLING INSPECTION OF GRAVEL AGGREGATE. /AUTHOR/

• Supplemental Notes:
  • Hpr, Bpr-86789
• Corporate Authors:

  Michigan Technological University, Houghton

  Houghton, MI  United States  49931
• Authors:
  • Carlson, D H
  • Volin, M E
• Publication Date: 1967-10

Subject/Index Terms

• TRT Terms: Absorption; Aggregate gradation; Aggregates; Capacitance; Cherts; Field studies; Gravel; Luminescence; Measurement; Microwaves; Moisture content; Neutrons; Nuclear magnetic resonance; Porosity; Quality control; Reflectivity; Sampling; Soil particles; Specific gravity; Thermal shock
• Uncontrolled Terms: Aggregate particles; Quality; Reflectance; Separation
• Old TRIS Terms: Field investigations; Heavy water
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00217469
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Files: TRIS
• Created Date: Dec 21 1994 12:00AM