| Summary: | Subgrade is the base ground surface or ground excavation or compacted
filled surface soil and form a base surface for placement the section of other
pavement. The strength and durability of pavement construction depends on the
characteristic of soil bearing capacity. The better spec for the subgrade soil, the
value of soil bearing capacity increasingly great.
This study aims to evaluate how much influence the use of stabilization
material (volcanic ash) with varying levels and constant mixture of lime on the
soil samples to the value of consistency limits, dry volume weight- moisture
content relation and review of the CBR value. The research was carried out by
mixing native soil with lime stabilization material constantly weight percentage of
5% and volcanic ash that varied by 5%, 10%, 15%, 20%, 25% and 30% of the
soil dry weight. To determine the maximum density and the value of CBR,
researcher use standard proctor device and CBR testing laboratory and Atterberg
limit testing to determine the limits of consistency.
These tests concluded that the soil samples in the category of poor clay
soil as subgrade material. After stabilized using volcanic ash and lime is seen that
there is an increase in the carrying capacity of the power, that�s increasing the
volume of dry weight, decreasing of soil swelling and increasing in the value of
CBR. However, the CBR value that less than 5% of the soil mixture experiment
results are categorized into the soil criteria with a low CBR value.
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