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Potential reactivity of granitic rocks. Petrographic characterization vs accelerated expansion tests
| IBRACON Structures and Materials Journal
Potential reactivity of granitic rocks. Petrographic characterization vs accelerated expansion tests
Violeta Ramos
Institute of Earth Sciences (ICT)
I. Fernandes
ICT, Institute of Earth Sciences, University of Porto, Porto, Portugal
S. Sousa Silva
LNEC, National Laboratory for Civil Engineering, Lisbon, Portugal
D. Soares
LNEC, National Laboratory for Civil Engineering, Lisbon, Portugal
F. Noronha
ICT, Institute of Earth Sciences, University of Porto, Porto, Portugal
Abstract
Several cases of alkali-silica reaction involving granitic aggregates have been diagnosed in damaged concrete structures in Portugal. Nonetheless, this kind of rock is usually regarded as slow/late reactive or even non-reactive to alkalis. Granitic rocks are widely exploited in Northern and Central Portugal, representing almost half of the produced aggregates in this country. Project IMPROVE rose from the need to accurately diagnose the potential reactivity of granites to alkalis. The study involved about forty granites collected from different regions in Portugal, from which the results of eight samples are being presented in this paper. The tests carried out include the petrographic analyses of the aggregates and mortar and concrete expansion tests. It was concluded that the content of microcrystalline quartz correlates better with the results of AAR-4.1 than with the other expansion tests.
Author Biography
Violeta Ramos, Institute of Earth Sciences (ICT)
ICT, Institute of Earth Sciences, University of Porto, Porto, Portugal