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 consoli-dated 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.

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