Effect of moisture on fractal dimension and specific surface of hardened cement paste by small-angle X-ray scattering

Finely divided fumed silica (Aerosil) has been used as a model substance to interpret the change in fractal dimension and specific surface of hardened cement paste (hcp) with relative humidity. Hcp is essentially a surface fractal at relative humidities below ca. 40% where the specific surface dimin...

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Bibliographic Details
Published inCement and concrete research Vol. 24; no. 4; pp. 605 - 612
Main Authors Beddoe, R.E., Lang, K.
Format Journal Article
LanguageEnglish
Published New York, NY Elsevier Ltd 1994
Elsevier Science
Subjects
Applied sciences
Buildings. Public works
Cement concrete constituents
Cements
Exact sciences and technology
Materials
Properties and test methods
Properties of anhydrous and hydrated cement, test methods
Mass surface
Hardened cement paste
Fractal dimension
Small angle X ray scattering
Cement
Humidity
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Summary:Finely divided fumed silica (Aerosil) has been used as a model substance to interpret the change in fractal dimension and specific surface of hardened cement paste (hcp) with relative humidity. Hcp is essentially a surface fractal at relative humidities below ca. 40% where the specific surface diminishes diminishes as surface area is lost around the gel particle contact points during adsorption. A “smoother” surface of lower fractal dimension results. Above ca. 40%rh the disjoining pressure opens up the entangled hcp gel structure to produce a more mass fractal structure of higher internal surface area.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0008-8846
1873-3948
DOI:10.1016/0008-8846(94)90184-8