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Hardened slag–cement pastes of various porosities. II. Water and nitrogen adsorption

1975; Wiley; Volume: 25; Issue: 11 Linguagem: Inglês

10.1002/jctb.5020251106

0375-9210

Raouf Sh. Mikhail, S.A. Abo-El-Enein, M. Abdel-Khalik,

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Abstract Specific surface areas and pore structure studies were carried out on hardened slag‐cement pastes. Water and nitrogen adsorption isotherms were measured, and the derived parameters were critically compared. Nitrogen areas and total pore volumes were found to be much smaller than water values. For water vapour adsorption, the specific surface areas derived from the adsorption branches are found to be lower than those derived from the resorption isotherms. Some evidence is presented in this paper that the surface area values derived along the adsorption branches are underestimated values, and that the resorption values might be considered to be nearer to the actual areas of the various pastes. Calculations of the hydraulic radii refute the hypothesis that the areas inaccessible to nitrogen are interlayer areas.