VOIDS IN ONE-SIZE SURFACE TREATMENT AGGREGATES AND DISCUSSION

A FUNDAMENTAL CONCEPT USED IN THE DESIGN OF SURFACE TREATMENTS IS THAT THE QUANTITY OF BITUMINOUS MATERIAL NEEDED IS DETERMINED AS THE AMOUNT REQUIRED TO FILL THE VOIDS BETWEEN THE AGGREGATES TO AN OPTIMUM DEPTH. THIS STUDY WAS PERFORMED TO DETERMINE THE INFLUENCE OF AGGREGATE CHARACTERISTICS ON THE VOID SPACE IN A ONE-SIZE SURFACE TREATMENT AGGREGATE. THE LABORATOTY INVESTIGATION WAS CONDUCTED BY SPREADING THE AGGREGATE ONE LAYER THICK IN A FLAT BOTTOM PAN AND POURING KNOWN VOLUMES OF WATER INTO THE CONTAINER BETWEEN THE AGGREGATE. BY MEASURING THE DEPTH OF THE WATER AND THE VOLUME OF THE VOIDS, THE PERCENT VOIDS COULD BE COMPUTED. THE VOLUME OF THE VOIDS DID NOT VARY IN DIRECT PROPORTION WITH THE DEPTH WITHIN THE AGGREGATE, AS IS ASSUMED IN CURRENT DESIGN METHODS. IN GENERAL, THE MORE ROUNDED AGGREGATES, SUCH AS THE GRAVELS, HAD A SMALLER VOLUME OF VOIDS THAN THE MORE ANGULAR CRUSHED STONE. IN SOME INSTANCES, THE DIFFERENCE IN THE PERCENT VOIDS PRODUCED BY A CHANGE IN SHAPE OF THE AGGREGATE WAS QUITE LARGER. REGARDLESS OF THE SHAPE OF THE AGGREGATE, THE SMALLER AGGREGATES HAD GREATER PERCENT VOIDS THAN THE LARGER AGGREGATES. THE AGGREGATE PARTICLES, WHEN PLACED WITH THEIR LEAST DIMENSION IN A VERTICAL DIRECTION, HAD LESS VOIDS THAN WHEN IN RANDOM ARRANGEMENT. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 60-77
  • Monograph Title: Surface treatments, bituminous mixtures and pavements
  • Serial:

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Filing Info

  • Accession Number: 00210278
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Oct 7 1994 12:00AM