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XRD patterns of cement composites at 28 day. (a) S1 sample; (b) S2 sample; (c) S3 sample; (d) S4 sample; (e) S5 sample. a: C3S, Ca2SiO5, Monoclinic; b: C2S, Ca2SiO4, Monoclinic; (c) SiO2, Tetragonal; d: CH, Ca(OH)2, Hexagonal; € CaCO3,Hexagonal; f: AFt, Ca6Al2(SO4)3(OH)12·26H2O, tetragonal; g: AFm,Ca4Al2O6(SO4)·14H2O, orthorhombic; h: C–S–H,Ca3Si2O7·xH2O, Amorphous; i: C–S–H, Ca3Si2O7·xH2O, Monoclinic; j: CaAl2Si6O16·6H2O, Tetragonal; k: CaHSi2O7, Orthorhombic.
