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Tricalcium aluminate Ca 3 Al 2 O 6, often formulated as 3CaO·Al 2 O 3 to highlight the proportions of the oxides from which it is made, is the most basic of the calcium aluminates. It does not occur in nature, but is an important mineral phase in Portland cement .
Monocalcium hexa-aluminate, CaO·6Al 2 O 3 (CA 6) (occurring in nature as hibonite, a representative of magnetoplumbite group [6]) In addition, other phases include: Dicalcium aluminate, 2CaO·Al 2 O 3 (C 2 A), which exists only at pressures above 2500 MPa. [7] The crystal is orthorhombic, with density 3480 kg·m −3. The natural dicalcium ...
Indeed, the tricalcium aluminate (C 3 A) is the most reactive phase of the four main mineral phases present in Portland cement (C 3 S, C 2 S, C 3 A, and C 4 AF). C 3 A hydration is very exothermic and also occurs very fast in the fresh concrete mix as the temperature quickly increases with the progress of the hydration reaction.
Tricalcium phosphate (sometimes abbreviated TCP), more commonly known as Calcium phosphate, is a calcium salt of phosphoric acid with the chemical formula Ca 3 (PO 4) 2. It is also known as tribasic calcium phosphate and bone phosphate of lime ( BPL ).
A number of aluminate oxyanions are known: The simplest is the approximately tetrahedral AlO 5− 4 found in the compound Na 5 AlO 4, [2] framework AlO − 2 ions in anhydrous sodium aluminate NaAlO 2 [3] and monocalcium aluminate, CaAl 2 O 4 made up of corner-sharing {AlO 4} tetrahedra. [4] A ring anion, the cyclic Al 6 O 18−
Calcium phosphate-based ceramics constitute, at present, the preferred bone substitute material in orthopaedic and maxillofacial applications, as they are similar to the main mineral phase of bone in structure and chemical composition. Such synthetic bone substitute or scaffold materials are typically porous, which provides an increased surface ...
In concrete chemistry, ettringite is a hexacalcium aluminate trisulfate hydrate, of general formula 6CaO·Al 2 O 3 ·3SO 3 ·32H 2 O, or 3CaO·Al 2 O 3 ·3CaSO 4 ·32H 2 O, also abbreviated as C 6 A S 3 H 32 in cement chemist notation. Ettringite is formed in the hydrated Portland cement system as a result of the reaction of tricalcium aluminate (C
Calcium phosphate stones account for approximately 15% of kidney stone disease. Calcium phosphate stones tend to grow in alkaline urine, especially when Proteus bacteria are present. It is the most common type in pregnant women. [6] Calcium phosphate is the usual constitution of microcalcifications of the breast, particularly dystrophic ...
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