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Evolution of C-S-H phase in ordinary Portland cement studied by Raman spectroscopy

After examining dry clinker with optical and atomic force microscopy and Raman spectroscopy, a wet cement paste was prepared from Portland cement powder and water with the water/cement mass ratio of ½. In a series of chemical reactions which followed, new chemical species were produced and the cement paste’s composition monitored every day during the first week and after four weeks (28th day) using both 532 nm and 1064 nm lasers as an excitation sources. The observed bands were interpreted using an ab initio phonon calculation for starting alite C3S and belite C2S crystal phases [1-3]. [1] W. G. Mumme, Neues Yahrb. Mineral. H 4 (1995) 145. [2] C. K. H. Jost, B. Ziemer, R. Seydel Acta Crystal. B33 (1977) 1696. [3] R. Dovesi, R. Orlando, B. Civalleri, C. Roetti, V. R. Saunders, C. M. Zicovich-Wilson, CRYSTAL: a Computational Tool for the AbInitio Study of the Electronic Properties of Crystals. Z. Kristallogr. Cryst. Mater. 220 (2005) 571

cement hydration ; C-S-H gel ; Raman spectroscopy ; alite ; belite ; phonon calculation

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