Influence of mesostasis in volcanic rocks on the alkali-aggregate reaction

Francieli Tiecher, Denise Carpena Coitinho Dal Molin, Márcia Elisa Boscato Gomes, Nicole Pagan Hasparyk, Paulo José Meleragno Monteiro

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Mesostasis material present in the interstices of volcanic rocks is the main cause of the alkali-aggregate reaction (AAR) in concretes made with these rock aggregates. Mesostasis often is referred to as volcanic glass, because it has amorphous features when analyzed by optical microscopy. However, this study demonstrates that mesostasis in the interstitials of volcanic rocks most often consists of micro to cryptocrystalline mineral phases of quartz, feldspars, and clays. Mesostasis has been identified as having different characteristics, and, thus, this new characterization calls for a re-evaluation of their influence on the reactivity of the volcanic rocks. The main purpose of this study is to correlate the characteristics of mesostasis with the AAR in mortar bars containing basalts and rhyolites. © 2012 Elsevier Ltd. All rights reserved.
Original languageEnglish (US)
Pages (from-to)1130-1140
Number of pages11
JournalCement and Concrete Composites
Volume34
Issue number10
DOIs
StatePublished - Nov 2012
Externally publishedYes

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