Results of basic geotechnical properties of ash-slag mixture and friction characteristics between ash-slag mixture and two types of needle punched geotextiles 400 and 1200 GSM are presented in the paper. Ash-slag mixture was originated from sedimentation tank of Arcelor Mittal Poland S.A. Steel Mill. Angle of internal friction and friction coefficient tests were carried out in the direct shear box apparatus with dimensions 12 × 12 cm. Test results revealed that ash-slag mixture has a relatively high strength parameters. It was also stated that friction coefficients between ash-slag mixture and geotextiles are slightly lower than internal friction of ash-slag.

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