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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: Concrete Science and Engineering
Abreviated Serial title: Concr. Sc. Eng.
ISSN: 1295-2826
Publisher: RILEM Publications SARL
Volume: 4
Issue: 15
Issue date: 2002-09-01
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: 2002-06-20
Classification: Scientific Reports
Publication type : full_text
Public price (Euros): 0.00


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