Reliability Estimate of the Compaction Characteristics of Iron Ore Tailings Treated Tropical Black Clay as Road Pavement Sub-Base Material

A FORTRAN based first-order reliability program was employed to evaluate the suitability of tropical black clay (black cotton soil, BCS) - iron ore tailings (IOT) mixture compacted with British Standard light, BSL or standard Proctor (relative compaction = 100%) energy as road pavement sub-base material. Using regression models for compaction characteristics, and established distributions for the relevant soil parameters, reliability indices were computed. The results indicate that for the laboratory-based model, reliability index is sensitive to variability in all the soil parameters. Observed trends indicate that IOT content, silt content, sand content and specific gravity are greatly influenced by the coefficient of variation (COV) and therefore must be strictly controlled in IOT treated BCS for use as sub-base material. Clay content has little effect. Stochastically, the compactive effort used did not produce acceptable safety index value. Therefore, higher compaction energy and more potent additives such as cement or lime are recommended to model compaction characteristics of BCS-IOT mixtures for use as sub-base material in road pavement.

Language

  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 855-864
  • Monograph Title: Geo-Chicago 2016: Sustainable Geoenvironmental Systems

Subject/Index Terms

Filing Info

  • Accession Number: 01611001
  • Record Type: Publication
  • ISBN: 9780784480144
  • Files: TRIS, ASCE
  • Created Date: Aug 11 2016 3:10PM