| Summary: | Clay soil is a fine-grained soil types, which have the nature and
development of high shrinkage, high consistency index, and strong support is low.
In this study tried utilizing merapi ash (volcanic ash), combined with lime as an
ingredient stability to resolve the issue.
The research was carried out by mixing the original soil stabilization
materials into six variations. Ash mixtures respectively variation of 5%, 10%,
15%, 20%, 25%, and 30%, of the dry weight of the soil. For all variations of the
same limestone at 5%, of the dry weight of the soil. Tests were conducted that test
the physical properties and mechanical properties test.
Results of original research in soil that has been mixed with ash and lime
merapi showed that the greater the ash content is given, the value of the plasticity
index tends to be small, and the sliding angle increases however, the value of
cohesion, and decreased permeability values. Based on these results, changes in
the properties of the physical and mechanical properties after the original soil
stabilized, then the optimal mixture that can be used for stability soil is mixed with
a variety of merapi ash mixture of 15% + 5% lime or ash merapi variation of 20%
+ 5% lime. Dissolved heavy metal content is still safe for the environment,
because the amount is very small and does not exceed the specified threshold
standard in the indonesian government regulation no.. 20 of 1990.
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