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>Effect of Volcanic Ash Utilization as Substitution Material for Soil Stabilization in View Point of Geo-Environment
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Effect of Volcanic Ash Utilization as Substitution Material for Soil Stabilization in View Point of Geo-Environment
Mount Merapi is one of the most active volcanoes in the world with eruption every two to five years. Frequent eruptions have resulted volcanic ash and become important environmental issues when it is not effectively reduced. In engineering practice, utilization of volcanic ash as substitution material is limited. Indonesia has a large road on soft soil and volcanic ash can be used as alternative in soil improvement. The objectives are focused on effect of volcanic ash content as substitution material for soil stabilization and also as new approach in view of environmental aspect for soft-soil improvement. Engineering properties of soil mixture, effect of volcanic ash content and its fines level are discussed. The fineness of volcanic ash is primary factor as pozzolan in stabilization process. Utilization of volcanic ash has grain size passing sieve number 270 is more effective. The effect of volcanic ash content on soil stabilization can improve the engineering properties of soft soil, change grain size distribution curve by decreasing of fine fraction, decrease consistency limits become non-plastic soil, increase bearing capacity, and decreases swelling potential. Addition of 35% of volcanic ash and 9% lime gives the most significant effect on soil improvement.
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