Geocomp > Soil > Standard Test Method for Expansion Index of Soils

Standard Test Method for Expansion Index of Soils

Test Method Title

Standard Test Method for Expansion Index of Soils

Reference Number

ASTM D4829

Material

Soil

Test Property

Expansion Index

Description of Test

A specimen is prepared by compacting a test soil into a metal ring at a degree of saturation of 50 6 2 %. The specimen and the ring are then placed in a consolidometer. A vertical confining pressure of 6.9 kPa (1 lbf/in.2) is applied to the specimen and the specimen is then inundated with distilled water. The deformation of the specimen is recorded for 24 h or until the rate of deformation becomes less than 0.005 mm/h (0.0002 in./h), whichever occurs first. A minimum recording time of 3 h is required.

Number of Test Specimens

1

Test Specimen Size

4" diameter x 1" high (starts 2" high)

Keywords

clays; expansive soils; index tests; laboratory tests; soil