Abstract
Aggregate tests are used worldwide to assess the durability of crushed stone. These standardized test methods aim to determine the resistance to wear by using given rotations as it is described in the European Norm of Micro-Deval test (EN 1097-1:2012). It recommends 12,000 rotations to determine the Micro-Deval coefficient of a rock. The present paper goes a step further since it aims to describe the long-term wear resistance of tested volcanic rocks (Nógrádkövesd, Hungary). Micro-Deval coefficients were determined after gradual increase of rotations from the suggested 12,000–780,000. The material loss was recorded in 65 steps, i.e., after each increment of 12,000 rotations. Not only the material loss but also grain shapes were documented. As it was expected the grains became smaller and more subspherical with the increasing number of rotations. Regression analyses were used to describe the material loss. Correlation between the number of rotations and the Micro-Deval coefficients were also outlined. Pearson coefficient of correlation was also calculated. Our test results suggest that during the long-term Micro-Deval tests the aggregate durability properties change due to long-term wear. The regression analyses of the results give a strong indication that polynomial and exponential curves are suitable to describe the changes in Micro-Deval coefficients on a long-term wear. These tests also demonstrate that it is possible to predict the long-term behaviour/wear of andesite under investigation by using the applied equations.
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Acknowledgements
The authors are indebted to László Ézsiás and COLAS Északkő Ltd. for providing andesite aggregate for the laboratory tests. Gyula Emszt and Bálint Pálinkás helped in laboratory analyses. The financial support of the Hungarian National Research, Development and Innovation (NKFI) Fund (K 116532) is appreciated.
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Czinder, B., Török, Á. (2019). Long-Term Wear of Aggregates Assessed by Micro-Deval Tests. In: Shakoor, A., Cato, K. (eds) IAEG/AEG Annual Meeting Proceedings, San Francisco, California, 2018 - Volume 3. Springer, Cham. https://doi.org/10.1007/978-3-319-93130-2_14
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