| Summary: | Clay soils have a high plasticity with a high degree of high shrinkage and low
strenght. Many examples of damage arising from the nature of the expansive clay
soils, such as a decrease in building foundations, crackes and waves on the
highway structures, bridge abutments tilt, and others. Many things were done to
improve the properties of expansive soils, like soil stabilization. Soil stabilization
is a soil mixing with certain materials in order to improve the properties of the
original soil. In this study, is used lime modified with Merapi volcano ash to
improve the physical and mechanical properties as add material.
Clay used in this study from Dusun Krebet, Kulon Progo Yogyakarta with a
mixture of volcano ash trim variations of as much as 15%, 20% and 25% and 5%
addition of lime for every variation of the dry weight of the soil mixture with
curing time for 1, 3, 7 and 14 days. The tests were a test of physical and
mechanical properties.
The results show that for each variation of the mixture, the curing mixture of
soil + volcano ash + limestone is influenced by the time. Shrinkage Limit,
Plasticity Index (PI), and the permeability coefficient tends to decrease during
14th day. Meanwhile cohesion values decreased on 3rd day and then rise again
with increasing curing aging time, so that the value of increased soil parameters
was increased. Based on these results, it can be concluded that the longer the
curing aging time on a mixture of clay, the better results will be obtained to
improve soil properties.
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