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

Title: Changes in pore structure and mercury contact angle of hardened cement paste depending on relative humidity
Author(s): J. Adolphs, M. J. Setzer, P. Heine
Paper category : journal
Serial title: Materials and Structures
Abreviated Serial title: Mater. Struct.
ISSN: 1359-5997
Publisher: RILEM Publications SARL
Volume: 35
Issue: 252
Issue date: 2002-10-01
Publication year: 2002
Pages: 477 - 486
Total Pages: 10
Nb references: 30
Language: English

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 disjoining 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.

Online publication: 2002-08-17
Classification: Scientific Reports
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/12685