Investigação
Influence of exchange cations on the catalytic conversion of limonene over Serra de Dentro (SD) and SAz-1 clays: Correlations between acidity and catalytic activity/selectivity
A bentonite collected at Serra de Dentro (SD), Porto Santo Island, Portugal, and the source clay SAz-1 (Cheto, Arizona) were ion-exchanged with different cations (Al3+, Ni2+, Cr3+ and Na+). Variable temperature diffuse reflectance (...)
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Contribution To Geotechnical Characterization Of Basaltic Pyroclasts
A.M. Malheiro; J.F. Vieira de Sousa;F.M. Marques;D. M. Sousa
Both the Azores and Madeira islands, located in North Atlantic Ocean, are of volcanic nature.
The present work focuses on the geotechnical characterisation of basaltic pyroclasts from the Azores and Madeira, in order to get some comparison among them. In order to characterize, evaluate the geomechanical properties and get some more geotechnical data about basaltic pyroclasts, some samples were collected in both archipelagos, to do some laboratory tests. In situ tests were also made with these materials.
Results include data on SPT tests, plate load tests, Los Angeles tests, in situ dry density and specific weight tests, determination of particle size distribution, compaction and CBR tests and consolidated drained (CD) direct shear tests.
Some correlations between several properties are presented, namely between the strength and the deformability of volcanic materials. Finally, some considerations are made about the potentially utilizations and problems related to engineering applications.
Rock Mechanics and Geo-Engineering in Volcanic Environments. Paper from the 3rd International Workshop, Puerto de La Cruz, Tenerife, 2010
CRC Press Taylor and Francis Group
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