The Atterberg limits varied among the soils. Values for
plastic limit (PL) ranged from 29% - 41% with Piarco being undetermined due to lack of cohesiveness. For both
limits moisture contents increased with increasing content
of clay and expanding minerals (Table 1), particularly evident with the greater PI for Princes Town versus Talparo, although the latter has a greater clay content. Reference [23] showed that Princes Town had a much
greater proportion of montmorillonite and vermiculite
than Talparo, which was dominated by illite and kaolinite.
They additionally showed that the Cunupia series had a
similar clay distribution to Talparo. Table 1 shows that
the plastic limit for Talparo and Cunupia was similar, supporting
this conclusion. It can be inferred that clay mineralogy
imparts a strong influence on the Atterberg limits. Although Chagaramus had a clay content of 43.3% it showed
a low plastic limit and liquid limit (LL) of 11% and 28% respectively. During preparation of the sample, especially for
determination of liquid limit, the soil showed signs of aggregate
integrity, which could have resulted in reduced specific
surface for water absorption. Reference [3] showed increased aggregate strength under wetting for tropical
soils with higher levels of organic matter. Although the limit values
were low, Chagaramus still fell into the category of a
highly plastic soil [24]. This presents challenges for use
as this soil is mostly water saturated in its natural state.
Talparo and Princes Town showed the highest PI, which
implies that they are most prone to stress related deformation [2]. The moisture contents identified are typical
during the rainy season and slumping is a common phenomenon on these soils, where proper drainage has not
been implemented. The monitoring of soil moisture contents through simple devices like the TDR meter would
greatly improve decision making with respect to applied
stresses on these soils.
The Atterberg limits varied among the soils. Values for
plastic limit (PL) ranged from 29% - 41% with Piarco being undetermined due to lack of cohesiveness. For both
limits moisture contents increased with increasing content
of clay and expanding minerals (Table 1), particularly evident with the greater PI for Princes Town versus Talparo, although the latter has a greater clay content. Reference [23] showed that Princes Town had a much
greater proportion of montmorillonite and vermiculite
than Talparo, which was dominated by illite and kaolinite.
They additionally showed that the Cunupia series had a
similar clay distribution to Talparo. Table 1 shows that
the plastic limit for Talparo and Cunupia was similar, supporting
this conclusion. It can be inferred that clay mineralogy
imparts a strong influence on the Atterberg limits. Although Chagaramus had a clay content of 43.3% it showed
a low plastic limit and liquid limit (LL) of 11% and 28% respectively. During preparation of the sample, especially for
determination of liquid limit, the soil showed signs of aggregate
integrity, which could have resulted in reduced specific
surface for water absorption. Reference [3] showed increased aggregate strength under wetting for tropical
soils with higher levels of organic matter. Although the limit values
were low, Chagaramus still fell into the category of a
highly plastic soil [24]. This presents challenges for use
as this soil is mostly water saturated in its natural state.
Talparo and Princes Town showed the highest PI, which
implies that they are most prone to stress related deformation [2]. The moisture contents identified are typical
during the rainy season and slumping is a common phenomenon on these soils, where proper drainage has not
been implemented. The monitoring of soil moisture contents through simple devices like the TDR meter would
greatly improve decision making with respect to applied
stresses on these soils.
การแปล กรุณารอสักครู่..
![](//thimg.ilovetranslation.com/pic/loading_3.gif?v=b9814dd30c1d7c59_8619)