Lime and Slag Admixture Improvement of Tropical Black Clay Road Foundation

An expansive tropical black clay (also known as black cotton soil because cotton plant thrives well on it) was treated with up to 8% lime and admixed with up to 10% blast furnace slag, BFS (a by-product of the smelting of ore metals) by dry weight of soil, respectively. Specimens of treated soil compacted at the energy of the standard Proctor (relative compaction = 100%) were subjected to index, compaction, unconfined compressive strength (UCS), California bearing ratio (CBR) and durability tests. The results of laboratory tests show that properties of the soil improved when treated with lime – slag blends. Free swell and linear shrinkage decreased from 70 and 13% for the natural soil to 19 and 5%, respectively, for soil treated with 6% lime/7.5% slag content. The UCS and CBR values increased from 490 kN/m2 and 8 % for the natural soil to 825 kN/m2 and 58%, respectively, at 8% lime /5% slag treatment. Optimum properties of the tropical black clay – lime - slag mixture were obtained at 8% lime/ 7.5% slag content based on strength and durability assessments The mixture can be used as sub-base and base courses of lightly trafficked roads.


  • English

Media Info

  • Media Type: DVD
  • Features: Figures; References; Tables;
  • Pagination: 18p
  • Monograph Title: TRB 89th Annual Meeting Compendium of Papers DVD

Subject/Index Terms

Filing Info

  • Accession Number: 01153535
  • Record Type: Publication
  • Report/Paper Numbers: 10-0585
  • Files: BTRIS, TRIS, TRB
  • Created Date: Jan 25 2010 10:18AM