Ettringite and calcium sulfoaluminate cement: investigation of water content by near-infrared spectroscopy |
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Authors: | Daniela Gastaldi Fulvio Canonico Enrico Boccaleri |
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Affiliation: | 1.Buzzi Unicem S.p.A,Casale Monferrato (AL),Italy;2.Department of Science and Advanced Technologies,Università del Piemonte Orientale,Alessandria,Italy |
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Abstract: | Calcium sulfoaluminate (CSA) cement is a sulfate-based binder whose high-performance hydraulic behavior depends on the rapid
formation of ettringite, when grinded clinker is hydrated in presence of gypsum. Ettringite is a calcium aluminum sulfate
mineral characterized by high water content, estimated as 32 water molecules per formula unit. Three examples of utilization
of near-infrared (NIR) spectroscopy are here shown. First of all, information on water distribution in pure ettringite was
deduced and compared with infrared analyses. Then its thermal behavior has been followed up to 400 °C, allowing to improve
the knowledge about water loss and thermal decomposition of this hydrated phase. Finally, the obtained results have been employed
in order to follow hydration of CSA cement sample, demonstrating thus that NIR spectroscopy, being highly sensitive to water
amount and distribution, can be an extremely useful tool for hydration studies. |
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