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- Today, in certain situations, pyrite can be considered a contaminant, notably when it is present in the backfill used for building construction.
www.envirourgence.com/en/blog/soil-contamination-pyrite/
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Is pyrite a contaminant?
What happens if you put pyrite in concrete?
Does pyrite oxidation cause ettringite corrosion?
Can pyrite damage your home?
- Chemistry
- Formation
- Construction
- Introduction
Pyrite and pyrrhotite are minerals known as iron sulfides. When iron sulfides are exposed to water and oxygen, a series of chemical reactions breaks down the iron sulfides and forms new minerals called sulfates. These sulfates take up more space than the original iron sulfides. As they grow, the new sulfate minerals push against the surrounding roc...
Pyrite is a common mineral in shale, coalbeds, and adjacent rocks. However, rocks containing pyrite generally dont cause swelling problems unless they are disturbed by human activity. Excavations and other ground disturbance during construction projects can break up the underlying rock, allowing water and air (and therefore oxygen) to get into the ...
Aggregates, such as sand, gravel, crushed stone, or other rocky material, are used as fill material in construction and are added to cement and water to make concrete. Aggregates come from a wide variety of sources, and sometimes the source rocks may contain pyrite or pyrrhotite. Problems can arise if these aggregates are used to make concrete or a...
Pyrite/pyrrhotite breakdown is just one of many ways in which buildings can be affected by physical or chemical processes in construction materials or underlying rock. Geotechnical engineers and engineering geologists identify potential problem areas and devise solutions to reduce the incidence of these and other damages.
Feb 1, 2021 · Pyrite contamination induced low corrosion potential and high current density. SEM images confirmed the presence of ettringite due to pyrite oxidation. XRD test indicated a portlandite consumption of up to 80% in contaminated samples.
- Ana Paula Brandão Capraro, Gustavo Macioski, Marcelo Henrique Farias de Medeiros
- 2021
Jun 1, 2024 · In the mitigating pyrite as a contaminant, ·OH assumes a central role. We thoroughly summarized the specific pathways by which reactive oxygen species originate from pyrite. This encompasses water oxidation on the sulfur-deficient regions of the pyrite surface, leading to the generation of ·OH.
Is pyrite a health hazard ? Yes, but not directly. The amount of sulphuric acid produced by pyrite during the chemical reaction is negligible, according to the Public Health Department of the Montérégie. The adverse effects of pyrite could however increase the level of humidity in basements as a result of the cracks that appeared in the slab.
In the United States, in Canada, [53] and more recently in Ireland, [54] [55] [56] where it was used as underfloor infill, pyrite contamination has caused major structural damage.
Mar 16, 2018 · This article presents information surrounding the expansive reaction related to an iron-sulfide-containing aggregate called pyrrhotite. Pyrrhotite is the suspected cause of concrete durability issues found in the northeast U.S. (Conn.), primarily used for residential foundations.
