1. Introduction. Ettringite Ca 6 Al 2 (SO 4) 3 (OH) 12 ⋅ 26H 2 O(C 6 A S ¯ 3 H 32 in cement chemistry notation) is one of the prominent compounds formed during cement hydration. Ettringite crystal structure has columns which run parallel to the c or needle axis [1].Its unit-cell is hexagonal, space group P31c, with a = 11.167 Å and c = 21.354 Å …
Ettringite occurs in xenoliths or metamorphosed limestone near igneous contacts. It also occurs as weathering crusts on larnite rocks. The minerals that are closely associated with ettringite include gypsum, mayenite, hydrocalumite, afwillite, hydrocalumite and portlandite. References. Ettringite – Mindat; Ettringite Mineral Data – Webmineral
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2. Formation of ettringite. Ettringite is a rare mineral phase in nature, while it exists commonly and largely in cement paste. Almost all alumina source, such as Al(OH) 3 gel, aluminium sulfate hydrate, C 3 A, can be reactive to form ettringite crystals [18], [27], [28]: with the addition of some calcium and sulfate source, the desired compound can be …
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To investigate the influence of ettringite on the hydration properties of CaO/fluorgypsum-activated granulated blast furnace slag binders, the ettringite content in hydrated pastes with different amounts of fluorgypsum added was measured by selective dissolution in an ethylene glycol/methanol solvent system. The effects of ettringite …