ESTIMATING SUBGRADE MOISTURE FOR PAVEMENT DESIGN - A SIMPLE METHOD

Determination of the subgrade strength under soaked condition in terms of soaked CBR value, as is mostly being practised in India results in grossly underestimating the subgrade strength and consequently the design pavement thickness works out to be highly uneconomical. For A realistic evaluation of subgrade strength, it is essential to determine it under equilibrium moisture conditions anticipated in the subgrade during the design life of the pavement. A mathematical moisture, involving only simple parameters like particle size distribution, plasticity index, dry density, ground water table depth and rainfall, was evolved and is presented in this paper. The developmentof this expression was based on an analysis of field and laboratory data obtained from 206 road sections spread over eight states of the country, covering a wide spectrum of variables which influence the critical subgrade soil types, ground water conditions, rainfall and other climatic conditions. (Author/TRRL)

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• Corporate Authors:

  Indian Roads Congress

  Jamnagar House, Shahjahan Road
  New Delhi,   India  110 011
• Authors:
  • Bindra, S R
  • Lal, N B
• Publication Date: 1980-9

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 97-116
• Serial:
  • Journal of the Indian Roads Congress
  • Volume: 41
  • Issue Number: 1
  • Publisher: Indian Roads Congress
  • ISSN: 0258-0500

Subject/Index Terms

• TRT Terms: Calculation; California bearing ratio; Density; Depth; Dry density; Estimating; Field tests; Laboratories; Mathematical models; Methodology; Moisture content; Pavement design; Pavements; Plasticity; Plasticity index; Rainfall; Soil water; Strength of materials; Subgrade (Pavements); Tests; Thickness; Water table
• Uncontrolled Terms: Particle size distribution; Pavement thickness
• Old TRIS Terms: Dry density (Soils); Subgrade moisture
• ITRD Terms: 6464: Calculation; 3087: California bearing ratio; 5908: Density; 6226: In situ; 6237: Laboratory (not an organization); 6473: Mathematical model; 9102: Method; 5920: Moisture content; 6200: Particle size distribution; 3055: Pavement design; 5922: Plasticity; 2950: Subgrade; 6255: Test; 4394: Water table
• Subject Areas: Design; Geotechnology; Highways; Hydraulics and Hydrology; Pavements; I22: Design of Pavements, Railways and Guideways;

Filing Info

• Accession Number: 00341120
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Oct 28 1981 12:00AM