Brunauer-Emmett-Teller (BET) surface areas of hydrated portland cement have been calculated from water-vapor and nitrogen-adsorption data. The adsorption and desorption of wat~r vapor caused. measurable decreases in specific surface areas by both water-vapor and mtrogen adsorptIOn. Changes were !tlso produced by wetting and drying. The adsorption and desorption of nitrogen at the boiling point of liquid nitrogen did not produce similar effects.
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Tomes et al. (1957) studied this question.