ABSTRACT
Swell Index Vijayvergiya and Gazzaly (1973) suggested a simple way of identifying the swell potential of clays, based on the concept of the swell index. They defined the swell index, Is, as follows
wI =_n s wI (18.10)
= natural moisture content in percent wI = liquid limit in percent
The relationship between Is and swell potential for a wide range of liquid limit is shown in Fig 18.16. Swell index is widely used for the design of post-tensioned slabs on expansive soils.
