Guirguis and Shehata CBM 2017.pdf (1012.3 kB)
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A new screening test to evaluate the presence of oxidizable sulphide minerals in coarse aggregates

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journal contribution
posted on 13.10.2021, 17:01 by Bassili Guirguis, Medhat ShehataMedhat Shehata
A simple screening test was proposed in order to test coarse aggregates for their potential to cause damage when used in concrete due to the oxidation of sulphide phases. The test involves submerging an aggregate sample in an oxidizing agent and measuring the mass loss. Samples with no known oxidizable sulphides showed a mass loss of <1.0% after one week of testing at room temperature. Samples of oxidizable sulphides showed a mass loss higher than 3.5% and changes in the colour of the test solution. It is proposed that aggregates which achieve a mass loss of less than 0.50% and no colour change in the test solution be accepted.

Funding

The funding for this research was provided by a grant from the Ministry of Transportation, Ontario (MTO) Highway Infrastructure Innovation Fund. The opinions expressed in this paper are those of the authors and may not necessarily reflect the views and policies of MTO. The authors would like to acknowledge the support of Ms. Carole Anne McDonald of MTO for her help in describing the aggregate samples. This research was also supported by the Ryerson University Faculty of Engineering and Architectural Science Dean’s Research Fund. The authors acknowledge the support of both organizations.

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