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5063617 
Journal Article 
The synthesis and hydration of ternesite, Ca-5(SiO4)(2)SO4 
Skalamprinos, S; Jen, G; Galan, I; Whittaker, M; Elhoweris, A; Glasser, F 
2018 
Yes 
Cement and Concrete Research
ISSN: 0008-8846 
113 
27-40 
WOS:000447116700003 
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 temesite, nominally Ca-5(SiO4)(2)SO4, are also reported including both chemically-pure temesite and preparations doped with sodium, potassium, phosphorous, magnesium, manganese, strontium, zinc and titanium oxides. Hydration of the samples at 25 degrees 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 degrees C achieved compressive strengths of approximate to 30 and approximate to 65 MPa at 28 and 90 days respectively, with C-S-H and gypsum as hydration products. The multi-phase temesite-based cements reached 7 day strengths of approximate to 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. 
Temesite; Synthesis; Hydration; Calcium sulfosilicate