NDLI: Changes in pore structure and mercury contact angle of hardened cement paste depending on relative humidity

Content Provider	Springer Nature Link
Author	Adolphs, J. Setzer, M. J. Heine, P.
Copyright Year	2002
Abstract	Hardened cement paste (hcp) is a porous heterogeneous material consisting of dispersed particles like Calcium Silicate Hydrates (C-S-H). These are of micron to nanometer size forming pores on a nanometer scale. Thus, hcp can be regarded as a colloidal system. Surface forces play a dominant role. Adsorbed water molecules interact with the surface. Capillary condensation occurs in the pores below bulk conditions acting in form of capillary and disjoning forces. All these forces are able to alter the structure and properties of the hardened cement paste depending on the moisture content. Pore size distributions were measured with mercury intrusion porosimetry on hcp specimens, which had been prestored over the entire range of relative humidity. Swelling and shrinkage of hcp tubes were also determined. The pore size distribution is corrected for each humidity step regarding the particular porosity, contact angle and volume change. The pore size distribution as a function of relative humidity is nonlinear and characterized by an extreme value in the medium range of humidity.La pâte de ciment durcie est un matériau poreux hétérogène consistant de particules dispersées comme les silicates de calcium hydratés (CSH). Ce sont des pores formés à l'échelle nanométrique allant de la taille du micron à celle du nanomètre. La pâte de ciment durcie peut être considérée comme un système colloïdal. Les forces de surface y jouent un rôle dominant. Les molécules d'eau adsorbées interagissent avec la surface. La condensation capillaire se produit, sous conditions macroscopiques, dans les mésopores. Elle est dominée par les forces capillaires et de disjonction. Toutes ces forces sont capables d'altérer la structure et les propriétés de la pâte de ciment durcie en fonction de sa teneur en humidité. La distribution de la taille des pores a été mesurée à l'aide de la porosimétrie par intrusion de mercure sur des spécimens de pâte de ciment durcie, entreposés à différent degrés d'humidité relative.Le retrait et le gonflement de tubes de pâte de ciment durcie ont aussi été déterminés. La distribution de la taille des pores pour chaque degré d'humidité a été corrigée en fonction de la porositè particulière, de l'angle de contact et des changements de volume. La distribution de la taille des pores en fonction de l'humidité relative n'est pas linéaire et est caractérisée par une valeur extrême pour une humidité moyenne.
Starting Page	477
Ending Page	486
Page Count	10
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	35
Issue Number	8
e-ISSN	18716873
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2002-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Theoretical and Applied Mechanics Structural Mechanics Mechanical Engineering Operating Procedures, Materials Treatment Civil Engineering Building Materials
Content Type	Text
Resource Type	Article
Subject	Building and Construction Mechanics of Materials Materials Science Civil and Structural Engineering

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