安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
|
- Pyrrhotite - Wikipedia
Pyrrhotite (pyrrhos in Greek meaning "flame-coloured") is an iron sulfide mineral with the formula Fe (1−x) S (x = 0 to 0 125) It is a nonstoichiometric variant of FeS, the mineral known as troilite Pyrrhotite is also called magnetic pyrite, because the color is similar to pyrite and it is weakly magnetic
- Pyrrhotite and Crumbling Concrete - CT. gov
Pyrrhotite weathering in the presence of moisture and air produces secondary minerals that expand, causing concrete to crack This compromises the structural integrity and accelerates degradation with the increased infiltration of water and air
- USGS Publishes Map of Potential Pyrrhotite Occurrences
Pyrrhotite, a mineral of concern for the construction industry, consists of iron and sulfur, and when exposed to water and air, it can break down to form secondary minerals that expand and crack concrete, causing concrete structures, like home foundations, to fail
- Pyrrhotite: Physical properties, uses, composition - Geology. com
Pyrrhotite is an iron sulfide mineral found in igneous and metamorphic rocks Its chemical formula of Fe (1-x) S indicates that it is deficient in iron - which causes pyrrhotite to be slightly to strongly magnetic After magnetite, pyrrhotite is the second-most-common magnetic mineral What Is Pyrrhotite?
- How do pyrite and pyrrhotite damage building foundations?
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
- Pyrrhotite: Mineral information, data and localities. - mindat. org
Pyrrhotite is found with pentlandite in basic igneous rocks, veins, and metamorphic rocks It is also often found with pyrite, marcasite, and magnetite It has varying magnetic powers, depending on the number of Fe vacancies in the crystal structure
- Pyrrhotite | Magnetic Properties, Iron Sulfide, Crystal Structure . . .
pyrrhotite, iron sulfide mineral (Fe 1–x S) in the niccolite group; in it, the ratio of iron to sulfur atoms is variable but is usually slightly less than one
- UNDERSTANDING PYRRHOTITE IN CONCRETE
Pyrrhotite is the suspected cause of concrete durability issues found in the northeast U S (Conn ), primarily used for residential foundations The foundations of interest are experiencing a slow crack development, resulting in the eventual loss of concrete strength
|
|
|