Details

Autor(en) / Beteiligte

• Rubert, S.
• Angulski da Luz, C.
• F. Varela, M. V.
• Pereira Filho, J. I.
• Hooton, R. D.

Titel

Hydration mechanisms of supersulfated cement: The role of alkali activator and calcium sulfate content

Ist Teil von

• Journal of thermal analysis and calorimetry, 2018-11, Vol.134 (2), p.971-980

Ort / Verlag

Cham: Springer International Publishing

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Considerable attention has been given to special cements, capable of reducing CO 2 emissions, energy and limestone consumption. Supersulfated cements are made of blast furnace slag (GBFS), calcium sulfate (CS), and small quantities of activator, but achieving their optimal proportions is complex. In this paper, the effects of the both CS and alkali activator (KOH) contents were studied. The main results showed that the compressive strength, heat of hydration, and consumption of anhydrite phase were strongly influenced by the alkaline content, while low calcium sulfate or alkaline content increased the formation of CSH. The instability of ettringite was verified: with low CS, the probable hypothesis was its conversion into monosulfate due to the scarcity of sulfate; with high CS, it was associated with intense, rapid consumption of anhydrite with high KOH content, followed by the precipitation of ettringite on the surface of slag grains and its conversion into monosulfate.