Field Permeability Test

The Field Density Test is conducted to determine the in-situ density and compaction quality of soil. It ensures that soil or fill layers meet the required compaction standards for safe construction of foundations, roads, and embankments.

By measuring the soil’s dry density, engineers can verify that the compaction meets design requirements, ensuring the stability and longevity of foundations, roads, and embankments. This test provides quick, reliable, and practical data for field quality control.

Methods

  • Sand Replacement  Method (ASTM D1556 / IS 2720 Part 28) – The method calculates soil density by measuring the volume of a hole excavated in the soil and the weight of soil removed, using standard sand to fill the hole.
  • Core Cutter Method (IS 2720 Part 29) – The method involves directly measuring the volume of a soil sample collected in a cylindrical core cutter and weighing it to calculate bulk density, then determining the dry density using moisture content

Advantages:

  • Simple, rapid, and reliable for clayey soils.
  • Requires minimal equipment and field setup.
  • Provides direct measurement of field density.
  • Equipment is portable and easy to use.

Limitations:

  • Not suitable for very coarse or gravelly soils.
  • Accuracy depends on careful handling of the cutter and soil sample.