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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 ...
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
C-S-H is the phase playing the role of the glue in the cement hardened paste and responsible of its cohesion. Cement also contains two aluminate phases: C 3 A and C 4 AF, respectively the tricalcium aluminate and the tetracalcium aluminoferrite.
AFm form inter alia when tricalcium aluminate 3CaO·Al 2 O 3, or C 3 A in CCN, reacts with dissolved calcium sulfate (CaSO 4), or calcium carbonate (CaCO 3). 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 ...
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4 AF) (white) and tricalcium aluminate (C 3 A) (grey) occupying interstitial space between alite (C 3 S) (blue) and belite (C 2 S) (orange) crystals. These are false (interference) colors. Calcium aluminoferrite (Ca 2 (Al,Fe) 2 O 5) is a dark brown crystalline phase commonly found in cements. In the cement industry it is termed tetra-calcium ...