Uraniferous bitumens found in black shales from the Permian rocks at Vrchlabí Krkonoše Piedmont Basin (Czech Republic) were described and characterized petrologically mineralogically. The sediments originated weathering products metasediments granitoids of Krkonoše–Jizera Orlice–Sněžník crystalline complexes. organic matter contained up to 4.8 wt.% uranium, as uraninite grains. Elements associa...

In the second direction, accompanying this outdoor ex­ posure, will be the standard laboratory tests on these same materials after they have been subjected to freezing and thaw­ ing, wetting and drying. Such laboratory work will, when compared to the outdoor experiment, tell us whether or not it is necessary to go through the actual construction of a test road in order to find out what may othe...

Roadway performance can be improved through utilizing modified bitumens and/or bituminous mixtures within the structure. Regarding this view, Kaolin-containing-Organic Additive Material (K-c-OAM) has been synthesized chemically in study. K-c-OAM is a new additive material obtained laboratory conditions with reaction of kaolin, kind clay, and ethylene glycol. 50/70 penetration grade neat bitumen...

High modulus bitumens modified by polystyrene-block-polybutadiene-block-polystyrene (SBS) with different molecular structure were investigated on dynamic shear rheometer and fluorescence microscopy to evaluate viscoelastic properties and morphology of binders. The results shows that storage modulus (G’) is obviously less than loss modulus (G”), which means viscous behaviour of bitumen is domina...