The deterioration of concrete in houses and other buildings in Québec due to reaction of iron sulphides (the mineral pyrrhotite) in the concrete aggregate is a significant and well-documented issue. The CSA Technical Committee on Concrete Materials and Construction (CSA A23.1/A23.2) is developing new provisions and information on this issue to be included in the next edition of CSA A23.1/A23.2 in 2019, including a test method intended to measure the sulphide sulphur content of aggregates.

The objective of the research project was to conduct a multi-laboratory study of the proposed test method in order to develop a precision statement and to determine if the test is sufficiently precise to be implemented in the next edition of CSA A23.1/A23.2.

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