SYNTHETIC AGGREGATES FOR HIGHWAY CONSTRUCTION

A STUDY WAS MADE TO IDENTIFY EXISTING AND POTENTIAL MATERIALS SUITABLE FOR PRODUCING SYNTHETIC AGGREGATES, TO CONCEIVE NEW METHODS OF PRODUCING SUCH AGGREGATES, AND TO EVALUATE THE PRESENT AND FUTURE PROSPECTS FOR THEIR USE IN HIGHWAY CONSTRUCTION. A LARGE NUMBER OF EXISTING AND POTENTIAL SYNTHETIC AGGREGATES WERE IDENTIFIED. SEVERAL MANUFACTURED OR BY-PRODUCT MATERIALS, SUCH AS LIGHTWEIGHT AGGREGATES AND BLAST-FURNACE SLAG, CURRENTLY ARE USED AS AGGREGATES. OTHER BY-PRODUCT OR WASTE MATERIALS THAT MIGHT BE USED AFTER MINOR MECHANICAL PROCESSING INCLUDE A NUMBER OF CERAMIC WASTES, VARIOUS INDUSTRIAL SLAGS AND CLINKERS DEMOLITION WASTES, AND SCRAP IRON OR STEEL. POTENTIAL METHODS WERE CONSIDERED FOR PRODUCING NEW SYNTHETIC AGGREGATES- BY SINTERING OR FUSING SUCH FINE-GRAINED NATURAL MATERIAL AS SAND, CLAY, OR SOIL, OR SUCH WASTE MATERIALS AS STEEL-FURNACE DUSTS OR MINING WASTES, OR BY CHEMICAL OR THERMOCHEMICAL PROCESSING OF MIXTURES SUCH AS THOSE OF SAND AND LIME OR FLY ASH AND LIME. THE ANNUAL TOTAL CONSUMPTION OF AGGREGATES HAS NOW REACHED 1.5 BILLION TONS AND IS EXPECTED TO INCREASE AS MUCH AS 50 PERCENT IN THE NEXT TEN YEARS. THE MOST SIGNIFICANT FUTURE DEVELOPMENT MAY BE THE USE OF JOB-SITE MATERIALS FOR MAKING SYNTHETIC AGGREGATES IN VERSATILE AND PORTABLE PROCESSING EQUIPMENT OR THE ESTABLISHMENT OF A WIDESPREAD SYNTHETIC AGGREGATE INDUSTRY WHICH PROCESSES WIDELY AVAILABLE MATERIALS SUCH AS CLAYS AND SHALES.

Media Info

  • Pagination: 11p
  • Serial:
    • NCHRP Report
    • Issue Number: 8
    • Publisher: Transportation Research Board
    • ISSN: 0077-5614
  • Publication flags:

    Open Access (libre)

Subject/Index Terms

Filing Info

  • Accession Number: 00217434
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Nov 18 1994 12:00AM