The synthesis and hydration of ternesite, Ca5 (SiO4 )2 SO4

Solon Skalamprinos*, Gabriel Jen, Isabel Galan, Mark Whittaker, Ammar Elhoweris, Frederik P. Glasser

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The hydration and strength evolution of two multi-phase ternesite-based cements with 15 and 29 wt% ternesite are reported. The synthesis and hydration properties of single phase ternesite, nominally Ca5(SiO4)2SO4, are also reported including both chemically-pure ternesite and preparations doped with sodium, potassium, phosphorous, magnesium, manganese, strontium, zinc and titanium oxides. Hydration of the samples at 25 °C was studied by calorimetry and quantitative X-ray diffraction. Unconfined compressive strength development was determined for up to 1 year. Single-phase chemically activated ternesite hydrated rapidly at 25 °C achieved compressive strengths of ≈30 and ≈65 MPa at 28 and 90 days respectively, with C-S-H and gypsum as hydration products. The multi-phase ternesite-based cements reached 7 day strengths of ≈30 MPa. It is concluded that ternesite reacts with water, exhibiting strength gain. The future of calcium sulfoaluminate and sulfosilicate cements is discussed and it is suggested that a considerable, and as yet unrealised scope exists for simultaneously optimising cementing properties while lowering production costs and reducing CO2 emissions.
Original languageEnglish
Pages (from-to)27-40
JournalCement and Concrete Research
Volume113
DOIs
Publication statusPublished - 2018

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