![]() ![]() ![]() ![]() Iron sulfide mineral (pyrrhotite) cracking may appear as variegated, "random pattern" cracking in concrete slabs, walls, and foundations whose concrete contains high levels of pyrrhotite. Foundation or Wall Cracking or Spalling Due to Foundation Materials or Contents Iron sulfide mineral (pyrrhotite) cracking We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. Click to enlarged this image and you'll also observe some spalling of the concrete surface.Įxperts may refer to random pattern concrete cracks as damage caused by inclusions, iron, Other foundation damage such as rust heaving or staining, frost damage, or spalling may also be due to the specific component mix of the foundation material or for masonry or stone foundations damage may be due to composition, inclusions, or placement of reinforcement in the mortar joints. This article includes contact information for the CCAB as well as ctiations of authoritative research on the effects of iron sulfide in concrete. Page top photo of foundation cracks attributed to concrete that included iron sulfide (pyrrhotite), provided courtesy of CCACB - Connecticut Coalition Against Crumbling Basements. We have no relationship with advertisers, products, or services discussed at this website.įoundation cracks or spalling due to choice of materials, contents, or inclusions:ĭefects in concrete mix (too much water, for example), or defects in placement of steel or iron reinforcement (too close to surface, for example), as well as use of problem materials in concrete such as excessive levels of coal ash, cinders, or pyrrhotite an cause horizontal, vertical, or varied-pattern or "wandering" cracks in masonry or masonry block foundations.Īndrson & Cobb (2008) have reported similar serious structural damage occurring in structures built on top of shale containing pyrite and sulfates, producing severly-cracked foundation walls and floor slabs. InspectAPedia tolerates no conflicts of interest. ![]()
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