724, Bériault, suite B,
Longueuil (Québec) J4G 1R8

1250, av. de la Station, casier 6
Shawinigan, Qc
G9N 8K9

François Hamel, Géo.



Pascal Fortin, Géo.

Chargé de Projet


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The issue, mostly known in the Mauricie region, is characterized by the excessive presence of sulphides (pyrrhotite, pyrite, chalcopyrite) in concrete, which can cause its sulphate expansion. As a result, this may bring about significant disturbances to the building’s foundations. The analysis mainly is an assessment of sulphide levels present within the large aggregates of the concrete in the foundation walls of the property. In relation to those levels, the risk of foundation disturbances is determined.

The first step of the expert assessment is to ascertain if the concrete is likely to contain problematic quantities of sulphides. If trials reveal such a possibility, it is recommended to proceed to the second stage of the assessment. This allows a more cost-efficient procedure, in case the levels in the concrete are not of problematic potential.

Expert assessment contents


Step 1

  • Property identification.
  • Sketch description of foundation disturbances.
  • Chemical analysis of the concrete samples.
  • Megascopic description of the concrete samples.
  • Syntheses and commentary concerning the results obtained.
  • Recommandation to pursue further analysis if necessary (Step 2).

Step 2

  • Analysis of the concrete sample’s  physical characteristics (compressibility, porosity, density). 
  • Detailed microscopic analysis in reflected light on puck section (identification of the sulphides present).
  • Trial results and laboratory observations.
  • Syntheses and commentary concerning the results obtained.

Benefits to our clients

  • Fast and efficient procedures.
  • Geologists are available to answer your questions directly.
  • Courteous and professional service .
  • Competitive pricing. 
  • Quality service to meet your needs.
  • A well-established laboratory.