ISSN: 1945-7545
CODEN: GTJODJ
Page Count: 6

Modified Free Swell Index for Clays

Sivapullaiah, PV
Scientific officer, research scholar, and professor, Indian Institute of Science, Bangalore,

Sitharam, TG
Scientific officer, research scholar, and professor, Indian Institute of Science, Bangalore,

Subba Rao, KS
Scientific officer, research scholar, and professor, Indian Institute of Science, Bangalore,

Abstract

Free swell tests are commonly used for identifying expansive clays and to predict the swelling potential. The method as proposed by Holtz and Gibbs suffers from inaccuracies in volume measurement of dry powder in air. In this paper, a nondimensional modified free swell index is proposed, which removes the uncertainties present in the Holtz and Gibbs method. The modified free swell index is shown to bear unique correlations with liquid limit (volume basis) and percent swell of oedometer specimens compacted to proctor optimum conditions.

Keywords:
soil tests, swelling index, expansive solids, free swell tests, pore fluids, laboratory tests, swell potential

Paper ID: GTJ10936J
DOI: 10.1520/GTJ10936J
ASTM International is a member of CrossRef.