Chapter 4. Overview of the Trois-Rivières (Québec, Canada) Pyrrhotite Issues

$39.50

J. Duchesne, PhD, A. Rodrigues, PhD and B. Fournier, PhD
Department of Geology and Geological Engineering, Université Laval, Québec, Canada
CRIB – Research Center on Concrete Infrastructure

Part of the book: Pyrite and Pyrrhotite: Managing the Risks in Construction Materials and New Applications

Abstract

Cases of concrete degradation associated with iron sulfide–bearing aggregates were identified in the Trois-Rivières area, Canada. Approximately 1500 residential houses, in addition to commercial and industrial sites, were affected by the premature deterioration of their concrete foundations. Petrographic examination of the damaged concrete samples revealed the presence of oxidized pyrrhotite. Secondary minerals such as iron oxyhydroxide, gypsum, ettringite, and thaumasite were also observed. These minerals originated from the oxidation of iron sulfides followed by an internal sulfate attack and caused expansion and cracking of the concrete. In many cases, the damage was severe to the point that such foundations needed to be replaced, which involved considerable costs. The decision of a first class-action suit determined that pyrrhotite present in the coarse aggregates produced from two quarries in the St. Boniface area, north of Trois-Rivières, is the only culprit and concrete structures containing more than 0.23% pyrrhotite (vol) are considered defective. This important case of concrete deterioration triggered research efforts for developing a quality control protocol to evaluate the potential reactivity of sulfide-bearing aggregates prior to their use in concrete.

Keywords: pyrrhotite, sulfide minerals, oxidation, expansion, concrete durability


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