Wpływ składu mineralnego na rozmakanie i pęcznienie niektórych iłów trzeciorzędowych

Abstract

INFLUENCE OF MINERAL COMPOSITION ON DRENCHING AND SWELLING OF SOME TERTIARY CLAYSThe author discusses in his paper the mineral composition and its influence on drenching and swelling, of 60 clay samples, stratigraphically belonging partly to the Miocene, but mostly to the Pliocene variegated clays. These clay samples were collected from the region of Konin (Central Poland), Turów (Lower, Silesia) and Żary (Western Poland).The investigation of the mineral composition bas been carried out on an apparatus for differential thermal analyses (D. T. A.), utilizing a temperature progression of 11°C./min., 0 ± 1°C. On the basis of the compiled differential curves there may be distinguished, among. the investigated clays, three main mineralogical types, i.e.: a kaolinit type, an illite type, with admixture of minerals of the montmorillonite group, and an illite type, with an equivalent content of minerals of this group (Fig. 1).Besides determination of the mineral composition by means of the D. T. A. method, this composition has additionally been determined, for three of the samples, by the X-ray method. The X-ray pictures of these samples are presented in Fig. 2, 3 and 4.