Influence of mesostasis in volcanic rocks on the alkali-aggregate reaction |
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Authors: | Francieli Tiecher Denise Carpena Coitinho Dal Molin Márcia Elisa Boscato Gomes Nicole Pagan Hasparyk Paulo José Meleragno Monteiro |
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Affiliation: | 1. Université de Lorraine, GeoRessources laboratory, CNRS, CREGU, 2 rue du Doyen Marcel Roubault TSA 70605, F-54518 Vandoeuvre-lès-Nancy Cedex, France;2. National University of Science and Technology MISIS, Leninskiy prospekt 4, 119049 Moscow, Russia |
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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. |
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