Simplified Method for the Determination of Apparent Surface Area of Concrete Products

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Title: Simplified Method for the Determination of Apparent Surface Area of Concrete Products

Author(s): L. F. Gleysteen and G. L. Kalousek

Publication: Journal Proceedings

Volume: 51

Issue: 1

Appears on pages(s): 437-446

Keywords: no keywords

Date: 1/1/1955

Abstract:
The hypothesis that the cementitious solid of autoclaved concrete products is crystalline and that of moist-air or atmospheric-steam cured units is gel-like in form served as the basis for this study. Estimate of degree of crystallinity was based on surface areas computed from BET nitrogen adsorption data. The results contradicted the hypothesis, the autoclaved products manifesting surface areas nearly twice as large as those of normally cured products. Water adsorption data obtained by a simple gravimetric adsorption method developed in this study indicated apparent areas of about equal magnitude for both types of curing, but these computed areas were much larger than those shown by nitrogen adsorption.