Durability Characterization of Marls from the Region of Dalmatia,Croatia |
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Authors: | Predrag Mi??evi? Goran Vlastelica |
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Institution: | (1) Faculty of Civil Engineering and Architecture, University of Split, Matice hrvatske 15, 21000 Split, Croatia; |
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Abstract: | Durability is one of the most important engineering properties of weak and clay-bearing rocks. Weathering can induce a rapid
change in rock material from initial properties to soil-like properties. The sensitivity of a rock type against weatherability
is usually described by a durability parameter, such as the slake durability index. However, marl resistance is not detected
satisfactorily by the durability indices by using slake durability test as suggested by ISRM for two wetting–drying cycles.
The results of this study are obtained from samples of compact or laminated eocene marls from region of Dalmatia, Croatia.
The samples were subjected to 4 cycles of slake durability, point load tests, determination of dry density, determination
of carbonate content and absorption of water. The scatter of data suggests that strength probably has no influence on the
durability of marls. On the other hand a separate group of marl samples have a second-cycle slake durability index higher
than approximately 85%, and the durability of these samples is classified as “medium-high” to “high”, although the visual
inspection of samples after testing, suggests that they should have “medium” to “low” durability classification. According
to obtained results these samples of marl fulfil the criterions for the durability classification: a carbonate content lower
than approximately 65%, a dry density lower than 2.4 Mg/m3, and values of water absorption higher than 5%. |
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