Abstract:
This research presents the study on the strength characterization of cement-treated Bangkok clay at
high water content by performing series of Unconsolidated Undrain Triaxial Tests ( UU tests)
varying cement content, water content, curing age and confining pressure. The purposes of this
research are as follows;
1) To study the strength behavior of cement-treated Bangkok clay at high water content
which is more realistic in the actual construction condition.
2) To study the suitability of characterizing triaxial behavior of cement-treated Bangkok
clay at high water content by UU tests.
3) To prepare the primary information for development of a constitutive model for
cement-treated Bangkok clay at high water content
4) To get insight into the strength behavior of cement-treated Bangkok clay at high water
content for improvement of mix design.
Totally 81 cases of UU tests ( 3 samples for each case) with different 3 cases for cement content, 3
cases for water content, 3 cases for curing age and 3 cases for confining pressure were conducted.
The experimental results show that all varying parameters affect the strength characteristics of
cement-treated Bangkok clay. Increases in cement content, curing age and confining pressure lead
to increasing strength, whereas, the strength decreases with increasing water content. Consequently,
the strength parameters, c and 0' are also affected by those parameters. Moreover, the strength of
cement-treated clay can be characterized with clay water-cement content ratio.
The results indicate that the cement-treated clay at high water content and low cement content with
short curing age exhibits undrain-clay-like behavior, that is the frictional angle approaches zero.
However, its behavior at high water content with long curing age and high cement content becomes
cohesive frictional material.