The study presents the results of research on the compressibility of two kinds of mixtures containing soda wastes from Inowrocławskie Zakłady Chemiczne „Soda Mątwy” S.A. and fly ashes from the heat-and-power station of the same plant. The tests were carried out in a prototype medium-size oedometer with the aim of determining the influence of compaction and saturation on the course of the consolidation process of the materials and the values of their compressibility moduli. The initial moisture content of wastes (close to optimal) was a constant, whereas the compaction index (from 0.80 to ca. 0.95) was a variable; the water conditions changed as well. An analysis of the test results made it possible to characterise the compressibility of the materials as dependent on the specified initial conditions, and to define the possibility of their utilisation in earth structures.

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