ENGINEERING PROPERTIES OF COMPACTED FLY ASH

THE LOWER COMPACTED DENSITY OF FLY ASH RELATIVE TO CONVENTIONAL EARTH FILL RECOMMENDS ITS USE WHEN A FILL OR EMBANKMENT MUST BE CONSTRUCTED OVER SOFT, COMPRESSIBLE GROUND. FIELD EVIDENCE TO DATE INDICATES THAT COMPRESSIBILITY OR SETTLEMENT OF COMPACTED FLY ASH FILLS IS NOT SIGNIFICANT. LONG TERM FIELD SETTLEMENTS CANNOT BE PREDICTED SATISFACTORILY ON THE BASIS OF SHORT TERM LABORATORY TESTS BECAUSE FLY ASH EXHIBITS AGE-HARDENING OR POZZOLANIC PROPERTIES. LOW LEVEL ADDITIONS OF LIME TO THE FLY ASH BEFORE COMPACTION ACCENTUATE THIS BEHAVIOR. FROST SUSCEPTIBILITY LIKEWISE IS NOT AS SERIOUS A PROBLEM IN COMPACTED FLY ASH AS MIGHT BE PRESUMED FROM ITS GRAIN SIZE DISTRIBUTION. GRADATION ALONE DOES NOT SUFFICE AS A CRITERION OF FROST SUSCEPTIBILITY; POZZOLANIC PROPERTIES ALSO PLAY AN IMPORTANT ROLE. UNDESIRABLE FROST HEAVE IN COMPACTED FLY ASH CAN BE REDUCED TO TOLERABLE LEVELS BY ADDITION OF LIME OR CEMENT. /AUTHOR/

• Supplemental Notes:
  • PROC PAPER 8840
• Authors:
  • GRAY, D H
  • Lin, Y K
• Publication Date: 1972-4

Media Info

• Pagination: p. 361-80
• Serial:
  • Journal of Soil Mechanics & Foundations Div
  • Volume: 98
  • Issue Number: sm4

Subject/Index Terms

• TRT Terms: Compaction; Compressibility; Fly ash; Frost susceptibility; Lime fly ash; Pozzolanic action; Properties of materials
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00214131
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 5 1972 12:00AM