A method is proposed for quantitatively predicting the volume of the major phases in hydrated cement pastes as a function of (1) the composition of the cement, (2) the degree of reaction, and (3) the initial water:cement ratio. This procedure is then used to develop a quantitative model for the surface area and volume of porosity that is accessible to nitrogen in C‐S‐H. Published values for surface areas and volume of pores are compared with the predictions made by the model. An implication of the model is that there are two types of C‐S‐H, or perhaps regions within the C‐S‐H: one that nitrogen can penetrate and one that it cannot.
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Jennings et al. (1994) studied this question.
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