MORE ON HOT STORAGE OF ASPHALT PAVING MIXTURES

STORAGE TESTS WERE CONDUCTED ON A COARSE MIX IN A BIN FLOODED WITH AN INNER GAS AND IN THE SAME BIN WITH NORMAL ATMOSPHERE. THE TESTS WERE MADE IN A 200-TON CAPACITY OVAL SHAPED BIN SEPARATED BY CIRCULAR SHAPED WALLS INTO TWO OVAL SHAPED 100-TON CAPACITY UNITS. THE BIN IS HEATED WITH HOT OIL AND INSULATED. THE BIN IS LOADED WITH SCREW CONVEYORS THAT TRANSPORT THE MIX FROM THE PUGMILL TO THE TOP OF THE BIN WHERE THE MIX IS TRANSFERRED TO A DISTRIBUTOR CONVEYOR THAT RUNS ALONG THE LONG AXIS OF THE BIN. FOUR SERIES OF TESTS WERE MADE TO STUDY THE EFFECT OF THE INERT ATMOSPHERE AND THE EFFECT OF TREATING THE ASPHALT WITH DC-200 SILICONE: (1) INERT ATMOSPHERE, SILICONE TREATED ASPHALT, (2) NORMAL AIR, SILICONE TREATED ASPHALT, (3) INERT ATMOSPHERE, NO SILICONE, AND (4) NORMAL AIR, NO SILICONE. THE STUDIES SHOW THAT BOTH INERT GAS AND SILICONE INCREASE TIME THAT A COARSE MIX COULD BE STORED WITHOUT DETRIMENTAL HARDENING OF THE ASPHALT AND WITH BOTH, THE MIX COULD BE STORED IN EXCESS OF 72 HOURS. SERIOUS SEGREGATION OCCURRED IN THE BIN WITH THE RESULT THAT SAMPLES OBTAINED DURING LOADING THE BIN WERE FINER THAN SAMPLES OBTAINED DURING LOADING EXCEPT FOR THE LAST LOAD WHICH WAS MUCH COARSER. THE ASPHALT CONTENT OF SAMPLES DRAWN FROM THE BIN SHOWED SIGNIFICANT VARIANCE FROM THAT OF SAMPLES TAKEN AS THE BIN WAS LOADED. THIS VARIANCE WAS CAUSED BY THE SEGREGATION. TEMPERATURE OF MIX DRAWN FROM THE BIN WAS VERY UNIFORM AFTER FOUR HOURS.

  • Supplemental Notes:
    • pp 1-16, 8 FIG
  • Corporate Authors:

    National Asphalt Pavement Association

    /Thirteenth Annual Convention
    ,   United States 
  • Authors:
    • Foster, C R
  • Publication Date: 1968-2

Subject/Index Terms

Filing Info

  • Accession Number: 00215108
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 9 1971 12:00AM