  The standard cement paste (C-43-St) was studied previously by static heating,
SH, immediately after 1 month hydration at w/c = 0.4 [J. Therm. Anal. Calorim.
69 (2002) 187]. This paste after 5-year ageing (unprotected from contact with
air) was subject to thermal analysis in air and in argon (DTA, DTG and TG), to
XRD at various temperatures, T, in a high temperature chamber, to mass
spectroscopy (MS) and to IR spectroscopy. The aim of this study was to compare
the results of SH (fresh paste) and of TG (the aged one), to verify the
assumptions made on SH interpretation and to check the change in hydration
products with ageing as measured by phase transformation on heating (deltaM
versus the final mass).
