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. 2017 Dec 18;7(12):457. doi: 10.3390/nano7120457

Table 4.

Crystal phases of cement composites.

Hydration Products Crystal System Cement Composites *
S1 S2 S3 S4
C3S, Ca2SiO5 Monoclinic + + + +
C2S, Ca2SiO4 Monoclinic + + + +
C3A, Ca3Al2O6 Orthorhombic + +
C4AF,Ca4Al2Fe2O10 Tetrahedral +
CaSO4·2H2O Monoclinic +
Al2O3 Hexagonal
SiO2 Tetragonal + + + +
CaO Cubic
Ca(OH)2 Hexagonal + + + +
CaCO3 Hexagonal + + + +
AFt,Ca6Al2(SO4)3(OH)12·26H2O Hexagonal + + + +
AFm,Ca4Al2O6(SO4)·14H2O) Hexagonal + + + +
C–S–H,Ca3Si2O7·xH2O) Amorphous + + + +
C–S–H(Ca3Si2O7·xH2O) Monoclinic + + +
CaAl2Si6O16·6H2O Tetragonal + + + +
Ca2H2Si2O7 Orthorhombic + + +
Ca6(AlSiO4)12·30H2O Cubic + + + +
Ca4Si4O4(OH)24·3H2O Monoclinic + + +
Ca3Si(OH)6(CO3)(SO4) 12H2O Hexagonal + + +
K2Ca5(SO4)6·H2O Monoclinic + +
CaFe5AlO10 Tetragonal + + +
Ca2Al2Fe2O8 Orthorhombic + +

* +: The crystal phases exist in cement composites.