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A worker works under 4 William Circle in Rutland as it is raised above its foundation due to the content of pyrrhotite, a mineral that causes foundation crumbling.
The contaminant is pyrrhotite, a naturally occurring sulfur-based mineral that degrades or “rusts” when exposed to air and water.
In poured concrete foundations, cracks and pipe penetrations are the most common entry points for seepage. These openings can be sealed from the interior. Epoxies, which are strong adhesives, or urethanes can be pressure injected into the openings, thus penetrating the foundation through to the exterior and cutting off the path of the seepage.
An unreinforced masonry building (or UMB, URM building) is a type of building where load bearing walls, non-load bearing walls or other structures, such as chimneys, are made of brick, cinderblock, tiles, adobe or other masonry material that is not braced by reinforcing material, such as rebar in a concrete or cinderblock. [1]
Repair principles which do not improve the strength or performance of concrete beyond its original (undamaged) condition include replacement and restoration of concrete after spalling and delamination; strengthening to restore structural load-bearing capacity; and increasing resistance to physical or mechanical attack.
A cluster of homes run by a condo association in Westminster, Massachusetts, has had at least 10 of 96 units, all built in the 1990s, test positive for pyrrhotite — racking up repair fees of ...