Pengaruh Abu Terbang Batubara Terhadap Sifat-Sifat Geoteknik Tanah Lempung Timbunan Badan Jalan

Recently, powdered coal is adopted as fuel for power station and cement industry. On the basis drawbacks of its use is the large quantity of produced fly ashes. It is becoming necessary to use them as beneficial material. In engineering practice, as road embankment material, clay posses disadvantage properties, include high plasticity and low shear strength. These properties can be increased by stabilization method using additive material such as fly ash. In view of this application, aim of the research is to explore the effect of fly ash on geotechnical engineering properties of clay. Fly ash used was from Paiton Power Stationand clay was from Kasihan, Bantul. Laboratory tests were conducted on pure clay and clay fly ash mixtures, in connection with the usage for road embankment material, these include specific gravity, index properties, particle size distribution, compaction characteristic, and unconsolidated- undrained shear strength characteristics. Variations of fly ash content used were 10%, 15%, 20%, and 25% of weight of dry clay. The research results showed the change of clay properties in line with the increment of fly ash added in clay. The change of particle composition and gradation in the clay fly ash admixtures may be the answer of the change of the properties. Katakunci: abu terbang batu bara - sifat-sifat geoteknik tanah lempun