CONSTRUCTION PROCEDURES USING SELF-HARDENING FLY ASH

Fly ash produced in Arkansas from burning Wyoming low sulfur coal is self-hardening and can be effective as a soil stabilizing agent for clays and sands. The strength of soil-self hardening fly ash develops rapidly when compacted immediately after mixing. Seven day unconfined compressive stengths up to 1800 psi were obtained from 20% fly ash and 80% san mixtures. A time delay between mixing the fly ash with the soil and compaction of the mixture reduced the strength. With two hours delay, over a third of the strength was lost and with four hours delay, the loss was over half. Gypsum and some commercial concrete retarders were effective in reducing the detrimental effect of delayed compaction. Adequate mixing of the soil and fly ash and rapid compaction of the mixtures were found to be important parameters in field construction off stabilized bases. (FHWA)

• Record URL:
  https://www.ardot.gov/wp-content/uploads/2020/11/HRC52_Construction_Procedures_Using_Self-Hardening_Fly_Ash.pdf
• 
• Corporate Authors:

  University of Arkansas, Fayetteville

  Department of Civil Engineering, 4190 Bell Engineering Center
  Fayetteville, AR  United States  72701

  Arkansas State Highway and Transportation Department

  9500 New Benton Highway, P.O. BOX 2261
  Little Rock, AR  United States  72203
• Authors:
  • Thornton, S I
  • Parker, D G
• Publication Date: 1980-9

Media Info

• Pagination: n.p.

Subject/Index Terms

• TRT Terms: Clay soils; Compressive strength; Fly ash; Gypsum; Sand; Soil compaction; Soil stabilization; Traffic delays
• Uncontrolled Terms: Unconfined compression
• Subject Areas: Construction; Geotechnology; Highways; Materials; I51: Earthworks and Soil Drainage;

Filing Info

• Accession Number: 00325947
• Record Type: Publication
• Source Agency: Federal Highway Administration
• Report/Paper Numbers: FHWA-AR-80-004 Final Rpt., FCP 44C2-144
• Files: TRIS, USDOT, STATEDOT
• Created Date: Mar 12 1981 12:00AM