In 1975 the cone penetrometer test was introduced by British Standards Institution as the preferred method for determining the liquid limit of soils. This paper presents the results of examining 600 liquid limit (ll) cone penetrometer test results and the calculation of correction factors similar to those for the one point cassagrande test method. It is shown that a reliable estimate of the liquid limit can be obtained by determining the cone penetration at one moisture content, instead of at several as presently required by B S procedure, and adjusting this moisture content by means of the correction factor to that required to give a soil penetration of 20 mm, ie, the liquid limit. The conversion factors vary with soil plasticity, hence soils are grouped into those with low, intermediate, and high plasticity (ll 20-35, ll 35-50 and ll >50), thereby ensuring that 95 per cent of the one point results will be within 3.5 per cent of the actual 11 value. (TRRL)

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 469-471
  • Serial:
    • Volume: 28
    • Issue Number: 4
    • Publisher: Thomas Telford Limited
    • ISSN: 0016-8505

Subject/Index Terms

Filing Info

  • Accession Number: 00330292
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: May 21 1981 12:00AM