STABLIZATION OF CRUSHED SLAG WITH IRON OXIDE FOR TOP COURSE PAVEMENT CONSTRUCTION

OWING TO THE ACUTE DEFICIENCY IN THE SHORT TERM COHESIVE PROPERTY IN THE FINE FRACTIONS OF CRUSHED SLAG, THE MATERIAL HAS NOT BEEN USED AS TOP COURSE CRUSHED ROCK PAVEMENT MATERIAL. WITH A VIEW TO REDUCING HAULAGE AND PRODUCTION COSTS, IRON OXIDE DUST WAS SUBSTITUTED FOR CRUSHED BASALT TO STABILIZE CRUSHED SLAG AS A TOP COURSE MATERIAL. THE DUST IS COLLECTED FROM ELECTROSTATIC PRECIPITATORS INSERTED IN THE STACKS OF OPEN HEARTH FURNACES AT THE STEEL WORKS. A SUITABLE COMBINATION WAS FOUND TO BE THAT OF 100 PARTS OF CRUSHED SLAG AND FIVE PARTS OF IRON OXIDE DUST BY WEIGHT. BESIDES SATISFYING THE DEPARTMENT'S SPECIFICATION IN EVERY RESPECT, THE MATERIAL HAS A HIGHER MAXIMUM DRY COMPRESSIVE STRENGTH AND ALSO HIGHER CBR VALUE THAN THOSE OF THE SLAG-BASALT MIXTURE USED PREVIOUSLY. A TEST SECTION LAID IN 1967 HAS PERFORMED WELL TO DATE. ONE MINOR DISADVANTAGE OF IRON OXIDE STABILIZED CRUSHED SLAG, DISCOVERED DURING SUBSEQUENT FULL SCALE APPLICATION, WAS THAT THE RED IRON OXIDE DUST TENDED TO STAIN THE CONCRETE KERB AND GUTTER. IN ADDITION, IF TRAFFIC WAS ALLOWED TO RUN OVER THE MATERIAL BEFORE IT WAS SEALED, OCCASIONAL OCCURRENCE OF DUST NUISANCE COULD BE ENCOUNTERED. THIS DISADVANTAGE MAY BE OVERCOME BY PREWETTING THE MIXTURE DURING PRODUCTION.

Media Info

  • Serial:
    • Volume: 5
    • Issue Number: Pt5

Subject/Index Terms

Filing Info

  • Accession Number: 00233239
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 2 1972 12:00AM