SCHOOL OF GRADUATE STUDIES FACULTY OF TECHNOLOGY ...
SCHOOL OF GRADUATE STUDIES FACULTY OF TECHNOLOGY ...
SCHOOL OF GRADUATE STUDIES FACULTY OF TECHNOLOGY ...
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2.2.3 Stress Condition<br />
Over consolidation, magnitude of surcharge load, thickness and location of potentially<br />
expansive layers influence shrink-swell phenomenon occurring in the system. These<br />
include the following<br />
Stress history<br />
Loading<br />
Soil profile<br />
2.3 Identification of Expansive Soils<br />
One of the most important measures to be taken prior to any design is to investigate<br />
whether a soil is potentially expansive or not. This can be done through a number of ways<br />
namely:<br />
Mineralogical Method<br />
Direct Measurement<br />
Indirect Method<br />
2.3.1 Mineralogical Methods<br />
Type of clay mineral is a fundamental factor, which determines the expansive behavior of<br />
a soil. Mineralogical test is used to identify this mineral. There are different types of<br />
techniques, which are used to identify the clay mineralogy. The common types of these<br />
techniques are:<br />
X –ray diffraction<br />
Differential thermal analysis and<br />
Electron microscopy<br />
Others also include infrared spectroscopy, dye adsorption and radio frequency electrical<br />
dispersion [14].<br />
10