Volume changes can be calculated from the hydration stoichiometry of C3S if the composition of C-S-H is taken as C1.7SH4.0 with a density of 1.85 g/cm3. The results are in general agreement with the volume changes determined by Powers. However, the calculated evaporable water content is higher and the space-limiting water-cement ratio is calculated to be 0.42. The calculations can be applied also to the pozzolanic reaction and predict a marked increase in solid volume. In that case the composition of C-S-H is modified to C1.5SH3.8.
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Young, J.F., Hansen, W. Volume Relationships for C-S-H Formation Based on Hydration Stoichiometries. MRS Online Proceedings Library 85, 313 (1986). https://doi.org/10.1557/PROC-85-313