struction of stiffened slabs-on-grade in expansive soils.
potential soil heave devaluation of swell behavior and
The PTI structural design procedure is described in
predictions of total and differential heave are deter-
paragraph 6-3b.
mined from the results of tests on undisturbed speci-
mens. Strength tests may be performed to estimate
4-2. Testing procedures
the bearing capacity of the foundation soil at the final
Quantitative characterization of the expansive soil
or equilibrium water content. A measure of shear
--
from swell tests is necessary to predict the anticipated
strength with depth is also needed to evaluate soil sup-
4-3
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