STABILISATION OF ALLUVIAL SOIL WITH LIME AND FLY ASH

The paper reports the results of laboratory investigations and field research on the stabilization of alluvial soil with lime and fly ash and the use of such stabilized soil as base or subbase in the lower layers of the pavement system for both roads and airfields. The investigation using fly ashes from three thermal power stations of Delhi, Kanpur and Faridabad showed that alluvial soils could be staisfactorily stabilized with 15 percent of lime and fly ash in the proportion of 1:4. These proportions enabled an increase in the CBR value from 8-14 to 52-110 without any additive. With the addition of 1 percent gypsum by weight of soil, lime and fly ash, the CBR value increased to 73-190. Improvement was also noticed in the unconfined compressive strength of the lime-fly ash stabilized soil when 1 percent gypsum was added. Higher concentration of lime improved neither the CBR value nor the compressive strength of the stabilized soil. Other additives such as sodium carbonate (0.1 percent) and calcium chloride (0.25 percent) improved the CBR value of the stabilized soil significantly but the compressive strength only marginally. The results show that lime-fly ash stabilized soil base/subbase course would be about 50 percent cheaper than conventional stone soling or granular layer with oversized stone metal, which it can replace, in areas, where fly ash is locally available and good quality stones are either costly or have to be transported from a long distance. /Author/

• Corporate Authors:

  Central Road Research Institute

  Delhi-Mathura Road
  New Delhi,   India  110020
• Authors:
  • Ghosh, R K
  • Chadda, L R
  • Pant, C S
  • Sharma, R K
• Publication Date: 1973-11

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: 23 p.

Subject/Index Terms

• TRT Terms: Alluvium; Base course (Pavements); Calcium chloride; Calcium oxide; California bearing ratio; Compressive strength; Costs; Field studies; Fly ash; Gypsum; Laboratory studies; Sodium carbonate; Soil stabilization; Subbase (Pavements)
• Uncontrolled Terms: Subbase
• Old TRIS Terms: Unconfined compression tests
• Subject Areas: Finance; Geotechnology; Highways;

Filing Info

• Accession Number: 00263841
• Record Type: Publication
• Report/Paper Numbers: RRP 130 RR Papers
• Files: TRIS
• Created Date: Dec 13 1974 12:00AM