In concrete chemistry, ettringite is a hexacalcium aluminate trisulfate hydrate, of general formula when noted as oxides: 6CaO·Al 2 O 3 ·3SO 3 ·32H 2 O. or 3CaO·Al 2 O 3 ·3CaSO 4 ·32H 2 O. Ettringite is formed in the hydrated Portland cement system as a result of the reaction of tricalcium aluminate (C 3 A) with calcium sulfate, both ...

Ettringite is a primary constituent of hydration of Portland cement concrete. Its formation plays an important role in the control of setting. Minor amounts of secondary ettringite are often encountered in air voids of hardened concretes, regardless of the type of cement used.

Ettringite Group. Although it is generally assumed that a solid solution series between ettringite and thaumasite exists, both species have different space groups and a possible discontinuity was identified, characterised by a gap in the a-dimension of the solid-solution phases (Barnett et al., 2000). Further work showed a miscibility gap in ...

2024年1月22日 · Ettringite is a rare gemstone sometimes formed naturally but more often found as a byproduct of hydrated cement. This guide covers ettringite properties, uses, benefits, history, and prices.

2024年7月19日 · What Does Ettringite Mean? Ettringite has a high mineral content of sulfate calcium sulfoaluminate. The former name for ettringite is “cement bacillus.” It occurs naturally or is formed by sulfate attack on mortar and concrete.

Ettringite is a mineral with formula of Ca 6 Al 2 (S 6+ O 4) 3 (OH) 12 ·27H 2 O or Ca 6 Al 2 (SO 4) 3 (OH) 12 ·27H 2 O. The corresponding IMA (International Mineralogical Association) number is IMA1962 s.p.. The IMA symbol is Ett.

Ettringite, Ca6Al2(SO4)3(OH)12.26H2O, or C6A¯S3H32 as it is known in cement chemistry notation, is a major phase of interest in cement science as a hydration product and in polluted soil treatment since its structure can accommodate with many hazardous cations.

Ettringite. Comments: Doubly-terminated crystals of glassy yellow ettringite on matrix. Location: N'Chwaning Mine, near Kuruman, South Africa. Scale: Crystal size 4 cm. © Rob Lavinsky

Ettringite is a hydrous calcium aluminum sulfate mineral first described in 1874 from Ettringer Bellerberg, Ettringen, Mayen, Eifel, Rheinland-Pfalz, Germany. The mineral was named for its place of discovery.

Spray of ettringite prisms on "antozonite" ("Stinkspat"). The ettringite was identified by EDS-analyses which revealed also trace amounts of Cu, Si and As. At very high magnifications the hexagonal cross-section and the basal pinacoid can be recognised.