Moisture and heat transport with particular reference to concrete

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Journal titleHighway Research Record
Pages516; # of pages: 12
Subjectair moisture transfer; heat transfer; porous concrete; phase transformation; hydration; porous media; moisture movement; diffusion; capillary flow; evaporation - condensation; capillary - funicular states; convective transport; pendular state; pore structure complexity; fresh concretes; hydration reactions; Moisture performance; Concrete
AbstractOver the years three theories have gained general acceptance in explaining the movement of moisture in porous media: the diffusion theory, the capillary flow theory, and the evaporation-condensation theory. Because a wet porous solid actually consists of at least three phases, the mechanism of simultaneous moisture and heat transport is very complex. During the capillary and funicular states of the system, moisture moves primarily by a convective transport mechanism, and the rate of moisture movement is relatively insensitive to the properties of the solid matrix. In the pendular state, the evaporation-condensation mechanism is predominant, and the rate of moisture migration depends on the complexity of the pore structure. For fresh concretes the related problems are augmented by the hydration reactions.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number12143
NPARC number20373912
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Record identifieraef31f4b-c1ae-4288-8d39-956736898233
Record created2012-07-23
Record modified2016-05-09
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