Metraipolis › archive › dc_bc72738cfb8a

AFm phases — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/AFm_phases
License (as archived): CC-BY-SA-4.0
Archived: 2026-11-07T00:00:39.031Z
SHA-256 of the archived text: ed917ba9a283ca7216a1f8253f05a06db81ebb5790b00cdd7e356beaaea5de2f
Stable URL of this page: https://metraipolis.com/documento/dc_bc72738cfb8a

How to cite

AFm phases — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/AFm_phases (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_bc72738cfb8a (Metraipolis archive dc_bc72738cfb8a, sha256 ed917ba9a283ca7216a1f8253f05a06db81ebb5790b00cdd7e356beaaea5de2f)

BibTeX

@misc{dcbc72738cfb8a,
  title = {AFm phases — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/AFm_phases},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_bc72738cfb8a; sha256 ed917ba9a283ca7216a1f8253f05a06db81ebb5790b00cdd7e356beaaea5de2f},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/AFm_phases. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

An AFm phase is an "alumina, ferric oxide, monosubstituted" phase, or aluminate ferrite monosubstituted, or Al2O3, Fe2O3 mono, in cement chemist notation (CCN). AFm phases are important hydration products in the hydration of Portland cements and hydraulic cements. They are crystalline hydrates with generic, simplified, formula 3CaO·(Al,Fe)2O3·CaXy·nH2O, where: CaO, Al2O3, Fe2O3 represent calcium oxide, aluminium oxide, and ferric oxide, respectively; CaX represents a calcium salt, where X replaces an oxide ion; X is the substituted anion in CaX: – divalent (SO2−4, CO2−3...) with y = 1, or;– monovalent (OH−, Cl−...) with y = 2. n represents the number of water molecules in the hydrate and may be comprised between 13 and 19. AFm form inter alia when tricalcium aluminate 3CaO·Al2O3, or C3A in CCN, reacts with dissolved calcium sulfate (CaSO4), or calcium carbonate (CaCO3). As the sulfate form is the dominant one in AFm phases in the hardened cement paste (HCP) in concrete, AFm is often simply referred to as Aluminate Ferrite monosulfate or calcium aluminate monosulfate. However, carbonate-AFm phases also exist (monocarbonate and hemicarbonate) and are thermodynamically more stable than the sulfate-AFm phase. During concrete carbonation by the atmospheric CO2, sulfate-AFm phase is also slowly transformed into carbonate-AFm phases.

Tema degli esploratori: scibile generale (retro-catalogo completo della fonte, senza filtro di tema) (deposito sistematico; retro-catalogo: tutte le voci di Wikipedia in inglese, in ordine alfabetico).
Fonte: Wikipedia in inglese, voce «AFm phases» — https://en.wikipedia.org/wiki/AFm_phases
Wikidata Q4651628: «calcium aluminate monosulfate» (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q4651628
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/AFm_phases?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1368620792, consultata il 2026-11-06T23:56:58.990Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 0befc77f56f4bcd92c53a212f3f6a59b490c2b66bf072c70bb95a9918459eb71