Ah. Delgado et al., COMPARISON OF IR TECHNIQUES FOR THE CHARACTERIZATION OF CONSTRUCTION CEMENT MINERALS AND HYDRATED PRODUCTS, Applied spectroscopy, 50(8), 1996, pp. 970-976
The influence of FT-IR sampling techniques on the characterization of
cement systems was investigated. Three FT-IR techniques were used to s
tudy tricalcium silicate (C3S), hydrated C3S, calcium hydroxide, and c
alcium silicate hydrate (C-S-H). They include transmission spectroscop
y (TS), photoacoustic spectroscopy (PAS), and diffuse reflectance infr
ared Fourier transform spectroscopy (DRIFTS). The TS technique (using
KBr pellets) was the most labor-intensive but was found to give the si
mplest spectra with well-defined bands. The PAS technique was found to
be the simplest technique but yielded bands at lower wavenumber than
TS. DRIFTS was determined to be a good alternative for cement powders
since it provided spectra similar to those for the TS technique. DRIFT
S required more sample preparation than PAS but less sample preparatio
n than the KBr pellet technique.