Exjobbsförslag från företag

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Förslaget inkom 2008-05-30

A comparison between the mineral composition of till matrix and the fines produced by the Los Angeles Drum test of till clasts

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 size distribution and lithological composition of the clasts >2cm has been studied at each site.
The aim of this x-job is to study the difference in the composition between the fines produced from LA drum test of different sizes of particles from till and the fines in the till.
In the project described above the till has been sieved into differ fractions: < 2cm; 1-1,4; 1,4-2; 2-6; 6-20 cm. There have been detailed studies on these fractions. The lithology of all the particles has been determined and the size and distribution has also determined.
The first fraction, < 2m, is a bulk sample of the till. It needs to be sieved and the size distribution determined. The fines, < sand, is to be analyzed with respect to mineral content. Each of the other 4 fractions is to be subjected to the Los Angeles Drum test, LA. The particles are placed in a drum with steel balls and rotated 2000 times. After drumming the material is sieved. The fines are to be retained and analyzed with respect to mineral content (similar to the fines in the till). The study can give us insight into how till matrix is related to the larger particles in transport.
In association to this project, another masters student project will image all the particles prior to and after the LA test. The aim of this is to study how particles change in size and shape due to impact.
The results of these two studies can be integrated and a discussion can be made as to how particles are broken down due to glacial transport.

The project is suitable for either an engineering or a geology student.
The advisor of the project is Docent Joanne Fernlund. You will also work in close cooperation with other master students working on associated projects and well as doctorate student Mimmi Arvidsson.


Informationen om uppsatsförslag är hämtad från Nationella Exjobb-poolen.