ROADSTONE TESTS ON PRESENT DAY BLAST-FURNACE SLAG

A DESCRIPTION IS GIVEN OF THE METHODS USED IN THE PRODUCTION OF BLAST-FURNACE SLAG, TOGETHER WITH A DESCRIPTION OF THE METHODS WHICH WERE USED TO OBTAIN A COMPREHENSIVE SET OF SAMPLES OF SCREENED SLAG AGGREGATE FROM EACH OF THE WORKS STUDIED. THREE OF THESE WORKS WERE USING DIRECT-TO-PIT SLAG, A FURTHER THREE WERE PRODUCING BALL SLAG AND THE REMAINING FOUR WERE PRODUCING LADLE-TO-PIT SLAG. THE RESULTS OF THE LABORATORY TESTS ON THE SAMPLES TAKEN AT HOURLY, DAILY AND MONTHLY INTERVALS ARE GIVEN IN FULL, TOGETHER WITH SOME ANALYSIS AND DISCUSSION. THE MAIN FINDINGS WERE: (1) THE DIRECT-TO-PIT SLAG TENDED TO HAVE A LOWER BULK DENSITY, SPECIFIC GRAVITY AND RESISTANCE TO CRUSHING AND ABRASION, AND A HIGHER WATER ABSORPTION AND RESISTANCE TO POLISHING THAN EITHER THE BALL SLAG OR THE LADLE-TO-PIT SLAG. FACTORS OTHER THAN THE METHOD OF COOLING (E.G. SLAG-VOLUME) MAY ALSO AFFECT THE BULK DENSITY OF THE SLAG, (2) OF ALL THE PROPERTIES STUDIED, ONLY THE WATER ABSORPTION AND SPECIFIC GRAVITY SHOWED CORRELATION WITH BULK DENSITY. (3) THE BULK DENSITY OF THE LIGHTER-WEIGHT SLAGS INCREASED AS THE PARTICLE SIZE DECREASED, (4) VARIABILITY WAS INDEPENDENT OF METHOD OF COOLING AND WAS LEAST FOR THE HOURLY SAMPLES AND MOST FOR THE MONTHLY SAMPLES, AND (5) THE VARIABILITY IN RESISTANCE TO POLISHING OF THE TEN SLAGS WAS SIMILAR TO THAT OF THE THREE QUARRIED ROCKS EXAMINED IN AN EARLIER INVESTIGATION, BUT THE VARIABILITY IN RESISTANCE TO CRUSHING OF THE SLABS WAS LESS THAN THAT OF THE QUARRIED ROCKS FOR THE HOURLY AND DAILY SAMPLES, AND GREATER FOR THE MONTHLY SAMPLES. /RRL/A/

• Supplemental Notes:
  • 26 Pp, 2 FiG, 17 TAB, 4 REF
• Corporate Authors:

  MINISTRY OF TRANSPORT, LONDON (UK)

  ,    
• Authors:
  • Hosking, J R
• Publication Date: 1967

Subject/Index Terms

• TRT Terms: Absorption; Blast furnaces; Bulk density; Cooling; Crushing; Laboratory tests; Particles; Polished aggregates; Production methods; Samples; Shape; Slag; Specific gravity; Water
• Old TRIS Terms: Particle shapes; Resistance
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00217666
• Record Type: Publication
• Source Agency: Road Research Laboratory /UK
• Files: TRIS, ATRI
• Created Date: Aug 5 1994 12:00AM