Strätlingite and calcium hemicarboaluminate hydrate in belite-calcium sulphoaluminate cement

Fei Song, Zhenglei Yu, Fengling Yang, Yunfei Liu, Yinong Lu

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Belite-calcium sulphoaluminate (BCSA) cement is a promising low-CO2 alternative to ordinary Portland cement. With high water cement ratio, phase compositions of the BCSA pastes at different curing ages were investigated via X-ray diffraction (XRD) and differential scanning calorimetry (DSC). Large amounts of water accelerated the hydration reaction significantly and substantial ettringite (C63 · H32, AFt) was generated in the early stages. With the carbonation of AFt in the later stages, lots of strätlingite (C2ASH8) and calcium hemicarboaluminate hydrate (C40.5H12, Hc) formed after curing age of 28 days. The microstructure of C2ASH8 and Hc in the BCSA pastes were observed and confirmed via a scanning electron microscope (SEM) and an energy dispersive X-ray spectrometer (EDS). The results indicated that C2ASH8 was thick hexagonal plate product and Hc was thin sheet-like product. C2ASH8 and Hc would stack together respectively in the later stages of hydration. In addition, spherical aluminum hydroxide (AH3) and rod-like AFt were also observed.

Original languageEnglish
Pages (from-to)269-274
Number of pages6
JournalCeramics - Silikaty
Volume58
Issue number4
StatePublished - 2014

Keywords

  • Belite-calcium sulphoaluminate
  • Calcium hemicarboaluminate hydrate
  • Hydration
  • Strätlingite

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