COLD WEATHER PAVING WITH GLASPHALT

DECREASED COOLING RATES, AS OBSERVED IN FIELD TESTS, FOR GLASPHALT AS COMPARED TO CONVENTIONAL STONE AGGREGATE ASPHALT HAVE BEEN FOUND TO BE CAUSED BY TWO EFFECTS: 1. THE RELATIVELY LONGER-THINNER GLASS AGGREGATE PARTICLE RESULTS IN A MORE EFFECTIVE TRANSFER OF HEAT TO THE GLASS PARTICLE BECAUSE OF THE SHORTER CONDUCTION PATH AND INCREASED HEAT TRANSFER SURFACE AREA. THE RESULT IS THAT FOR THE SAME MEASURED "BULK" TEMPERATURE, THE GLASS AGGREGATE PARTICLE ACTUALLY CONTAINS MORE THERMAL ENERGY THAN DOES THE STONE AGGREGATE PARTICLE. 2. THE EFFECTIVE THERMAL CONDUCTIVITY OF GLASPHALT IS LOWER THAN THAT FOR A CONVENTIONAL MAT BECAUSE OF THE SHAPE OF THE GLASS AGGREGATE AND ITS ORIENTATION IN THE MAT. THIS EFFECTIVE LOWERING OF THE THERMAL CONDUCTIVITY CAN BE EXPLAINED BY A COMBINATION OF RESISTANCES APPROACH. THE RESULT OF THE ABOVE IS THAT THE GLASPHALT MAT: (1) CONTAINS MORE THERMAL ENERGY INITIALLY; AND (2) COOLS AT A SLOWER RATE THAN DOES THE CONVENTIONAL MAT. THE COMBINATION OF MORE ENERGY INITIALLY AND SLOWER HEAT LOSS RESULTS IN THE INCREASED COOLING TIMES EXPERIENCED IN THE FIELD TESTING OF GLASPHALT UNDER COLD WEATHER CONDITIONS, THIS EXTENDED COOLING TIME FOR GLASPHALT WOULD BE EXTREMELY BENEFICIAL IN ALLOWING SUFFICIENT TIME FOR COMPACTION OF THIN MATS, WHERE, WITH CONVENTIONAL ASPHALT PAVING, PAVING OPERATIONS WOULD BE POSSIBLE.

  • Corporate Authors:

    Symp On Secondary Uses of Waste Glass

    ,    
  • Authors:
    • Dickson, P F
  • Publication Date: 1973-1

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 18 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00211802
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 24 1973 12:00AM