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Ettringite

A calcium sulphoaluminate hydrate (6CaO . Al2O3 . 3SO3 . 32H2O) forming acicular crystals in early cement hydration; inhibits the flash set of C3A.

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ClinkerPortland cementPortlanditeAlite (C3S)Aluminate (C3A)ASTM C150Belite (C2S)C-S-H gelCalcium sulphate hemihydrateENFSI ENG-FG1FTIR (Fourier transform infrared spectroscopy)Pozzolan

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