Alkali-Aggregate Reaction: A study of the influence of the petrographic characteristics of volcanic rocks

  • F. Tiecher Polytechnic School of Civil Engineering, IMED Passo Fundo, Brazil
  • M. B. Gomes Department of Geology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
  • D. C. C. Dal Molin Department of Civil Engineering, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
Keywords: alkali-aggregate reaction, volcanic rocks, basalt, rhyolite


When the rock involved in the alkali-aggregate reaction (AAR) is volcanic, the matter present in the interstices of the grains, called mesostasis is considered responsible for the expansions. Mesostasis is a residue which consists of mineral phases rich in silica and alkalis (K and Na) and in optical microscopy looks like amorphous matter. By means of scanning electron microscopy (SEM) and with the aid of energy dispersive spectroscopy (EDS), the presence of well-crystallized mineral phases in mesostasis can be observed. The objective of this study was to evaluate the amount, the chemical composition and the degree of crystallinity of mesostasis on the reactive potentiality of volcanic rocks.


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