caa a22 4500 605454388 CHVBK 20210128100206.0 cr unu---uuuuu 210128e20151101xx s 000 0 eng 10.1007/s10064-014-0716-3 doi (NATIONALLICENCE)springer-10.1007/s10064-014-0716-3 A study of the alterability of basaltic lithotypes from the Itaipu Dam site (southern Brazil) [Elektronische Daten] [Patricia de Oliveira, Josiele Patias, Lázaro Zuquette] The alteration of geological materials is a natural process and the measurement of these effects is of great importance in ensuring the safety of engineering works. This study presents results from a set of simple and low-cost tests using specimens lacking a specific geometry. The principal objective of this study was the geological-geotechnical characterization of various basaltic lithotypes, focusing on evaluating the alterability of the rock. Accordingly, this study included tests of point load strength, physical properties (apparent density, apparent porosity, and water absorption), natural alteration, pH, and electrical conductivity (dissolution of ions). Laboratory test results showed good correlation between these parameters, but the results should be interpreted with caution because they were strongly associated with the presence of secondary minerals, the size and distribution of vesicles and amygdules, and the state of alteration of the rock. The specimens subjected to natural alteration in the laboratory failed to develop a significant degree of alteration and, therefore, did not present large changes in point load strength parameters and physical rock properties throughout the alteration cycling tests. Nevertheless, the influence of plagioclase alteration on various laboratory parameters was clearly observed when specimens were analysed microscopically (200×). Springer-Verlag Berlin Heidelberg, 2015 Basalt nationallicence Alterability nationallicence Itaipu Dam nationallicence de Oliveira Patricia Technological Federal University of Paraná, UTFPR-TD, Toledo, PR, Brazil aut Patias Josiele Itaipu Dam, Foz do Iguaçu, PR, Brazil aut Zuquette Lázaro University of São Paulo, EESC/USP, São Carlos, SP, Brazil aut Bulletin of Engineering Geology and the Environment Springer Berlin Heidelberg 74/4(2015-11-01), 1331-1348 1435-9529 74:4<1331 2015 74 10064 https://doi.org/10.1007/s10064-014-0716-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10064-014-0716-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- de Oliveira Patricia Technological Federal University of Paraná, UTFPR-TD, Toledo, PR, Brazil aut NATIONALLICENCE 700 1- Patias Josiele Itaipu Dam, Foz do Iguaçu, PR, Brazil aut NATIONALLICENCE 700 1- Zuquette Lázaro University of São Paulo, EESC/USP, São Carlos, SP, Brazil aut NATIONALLICENCE 773 0- Bulletin of Engineering Geology and the Environment Springer Berlin Heidelberg 74/4(2015-11-01), 1331-1348 1435-9529 74:4<1331 2015 74 10064