A range of portland cement pastes were examined by X‐ray diffraction, analytical electron microscopy, thermogravimetry, and CO 2 analyses. Quantitative estimates of the phase compositions of the pastes and of the chemical compositions of the individual phases within them were obtained, and mass balance calculations were done for each oxide component to test the mutual consistency of the results. As a further test, thermo‐gravimetric curves were calculated from the phase compositions and compared with those found experimentally. Volume percents of phases, porosities, and related quantities were also calculated. For a typical cement cured for 28 d in a sealed container at a water, cement ratio of 0.5 and equilibrated at 11% rh, the calculated volume percents are as follows: unreacted clinker phases, 11; C‐S‐H, 29; Ca(OH) 2 , 11; AFm phase, 9; CaCO 3 , 1; pores, 39.
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Taylor et al. (1985) studied this question.