Kvartära leror som nyttiga råmaterial i industri och teknik

Abstract

The report given here is an attempt to present some knowledge, still somewhat heterogeneous, of the characteristics of Swedish glacial and postglacial clays when utilized as raw material.

After having discussed existing deposits, genetics and petrography principally with reference to the literature a report is made on the most essential applications of said clays particularly in construction engineering and the production of building material (bricks etc.).

Data from the State Road Institute of Sweden verify the comprehension obtained from agro-geological maps referring to the grain size of the clays in various districts of the country.

Deviations in the relation between the disintegration time and the plasticity expressed as the water content difference at two different strengths (V₁₀—V₁₀₀) would indicate still unknown differences in the composition.

After having examined the grain size analyses of the Brick Laboratory it has been proved that most Swedish brick clays have a low degree of sorting and mostly show a coarse grain size.

In this connection the problem of suitable clays for moulds used in the production of cast iron and brass etc. is of evident interest. It would be of great value if reliable standard qualities made of these Swedish clays were available in the market for applications referred to in this article.