Effect of grain shape and petrographic composition of railway ballast on the Impact Test, by Elisabeth Uhlig.

For those interested in the properties of railway ballast and durability – and the use of PETROSCOPE 4D – and if you are near to Graz in Steiermark, Austria! 

Then you should go to Graz University of Technology / Technische Universität Graz on Wednesday 2nd April 2014 for the defence of the master thesis, “Effect of grain shape and petrographic composition of railway ballast on the Impact Test”, by Elisabeth Uhlig.


The presentation of Elisabeth’s master thesis will be held up 
on 
Wednesday 2nd April 2014
13.00- 13.45 hours
Seminarraum Betonbau Lessingstraße 25/I (room 108).
(presentation and examination in German)
Elisabeth investigated the impact of varieties in grain shape, angularity and petrographic composition on the result deviation of the Dynamic impact Test acc. to EN 1097-2. For a precise and efficient analysis of grain shape and angularity,PETROSCOPE 4D was used. The samples were scanned using the Petroscope device, the impact test was carried out after that and afterwards, the samples were scanned again in order to determine changes in particle size distribution, shape and augularity. She could illustrate that particle angularity does not affect test results, but shape does. The comparison of pre-test and post-test particle size distribution showed that the test result SZ_RB reflects the true degree of fragmentation.
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