Table 4.
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.