Exjobbsförslag från företag

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Förslaget inkom 2008-05-30

Comparison between the mineralogical compositions of the fines (clay to sand fractions) of till and crushed bedrock

The project is associated with a larger project, financed by Formas.

The aim is to study the physical composition of the till and see if and how there is a couple to bedrock properties. The project studies till from all different aspects. Two test areas associated with rock quarries have been studied in detail, one at Olunda near Uppsala, and one at Bäckseda near Vetlanda. Several geophysical tests have been made over a test area of till at each site. This includes georadar, resistivity, magnetic susceptibility, VLF and seismic. The total size distribution and lithological composition of the clasts has been studied at each site, from either sections or sample pits. The size distribution and the composition of the clasts are determined.
The project aim is associated with our ability to predict whether or not the rock mass at a given site will yield good quality aggregate. We are studying till in areas around existing rock quarries to see if and how the till can give us knowledge of the rock mass quality. By studying the fines of both the till and the fines produced by crushing the rock we can evaluate if they are similar and if the till can be used to predict the crushed rock properties.
The aim of this master’s project is to compare the mineralogical composition of the fine fraction in till and the fine material produced in a rock quarry. There are several criteria for aggregates quality for cement. This includes that the particles have a good “rounded” form to insure good fluid characteristics. Minerals such as mica with a very platy form will deter the flow ability of the concrete paste. The rocks must be non-reactive in the concrete. There are several minerals that react in concrete causing Alkali-Silica reactions. The result is that a gel is formed which has a larger volume than the mineral. Thus the concrete cracks. Sulphate reactions are also unwanted. They cause cracking and discolouring of the concrete.

The student requires good knowledge in petrography and mineralogy as well as some knowledge of thin section analysis.
The advisor of the project is Docent Joanne Fernlund.


Informationen om uppsatsförslag är hämtad från Nationella Exjobb-poolen.