HOT STORAGE MIX: STATE OF THE ART

HOT MIX STORAGE FALLS INTO THREE CLASSIFICATIONS BASED ON EQUIPMENT AND STORAGE TIME: (1) THE SURGE BIN IS NOT USED FOR MORE THAN 12 HOURS STORAGE AND IS USUALLY INSULATED AND HEATED; ALL THE PLANTS PORDUCTION PASSES THROUGH IT, (2) THE SILO RECEIVES MIXES CONVEYED FROM THE PLANT AND STORED FOR LONG PERIODS DEPENDING ON THE INDIVIDUAL APPLICATION, AND (3) A SATELLITE PLANT IS A SILO LOCATED REMOTELY FROM THE PLANT AND RECEIVING TRUCKED-IN MIX. THIS UNIT HAS AN APPLICATION IN METROPOLITAN AREAS, WHERE ZONING REGULATIONS AND AIR POLLUTION PROBLEMS WILL NOT ALLOW THE LOCATION OF A HOT MIX PLANT. THE PROBLEMS ENCOUNTERED IN HOT MIX STORAGE ARE: HEATING, SEGREGATION, OXIDATION AND CONVEYING THE MIX. EACH IS ENCOUNTERED WHEN THE MIX IS STORED FOR EXTENDED PERIODS. ONLY SEGREGATION AND CONVEYING NEED BE CONSIDERED IN A SURGE BIN, SINCE THE MIX WILL BE STORED FOR ONLY A FEW HOURS. SINCE SEGREGATION DURING LOADING IS USUALLY UNAVOIDABLE, THE BIN MUST BE DESIGNED TO REMIX THE SOLIDS IF THEY ARE REMOVED. WITH PROPER BIN DESIGN MIX CAN BE STORED WITHOUT SEGREGATION, AND IF THE BIN IS PROPERLY JACKETED WITHOUT LOSS IN TEMPERATURE. MIX CAN BE STORED SAFELY FOR 10 DAYS UNDER AN INERT GAS ATMOSPHERE AND FOR 14 DAYS WITH THE ADDITION OF SILICONE AND UNDER AN INERT GAS ATMOSPHERE. FIELD TESTS ON SILOS WHICH HAVE BEEN OPERATING FOR 12 TO 24 MONTHS HAVE SHOWN THAT, BY USE OF HEATED CONVEYORS, OPERATING AND MAINTENANCE COSTS ARE NOT A SIGNIFICANT FACTOR WHEN COMPARED TO THE SAVINGS AVAILABLE BY THE USE OF A SILO. SINCE THE MECHANICAL PROBLEMS OF HOT MIX STORAGE ARE OVERCOME, THE FEASIBILITY OF STORING HOT MIX IS PURELY ECONOMICAL.

  • Supplemental Notes:
    • Vol 112, No 4, PP 132, 134, 136, 145, 6 FIG, 1 TAB
  • Authors:
    • Brock, J D
    • Mize, E G
  • Publication Date: 1969-8

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Filing Info

  • Accession Number: 00211556
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 13 1970 12:00AM