Moisture transport across interfaces between autoclaved aerated concrete and mortar

  1. (PDF, 543 KB)
  2. Get@NRC: Moisture transport across interfaces between autoclaved aerated concrete and mortar (Opens in a new window)
DOIResolve DOI:
AuthorSearch for: ; Search for: ; Search for:
Journal titleJournal of Thermal Envelope & Building Science
IssueJanuary 3
Pages213236; # of pages: 24
Subjectmoisture, transport, interface, bonded contact, natural contact; Mortar; Concrete
AbstractExperiments were carried out to study the moisture transport across bonded or natural contact interface between AAC and mortar. Bonded contact, in the present study, refers to the contact between two building materials involving penetration of pore structure with a bonding agent, while natural contact refers to the good physical contact between two building material without penetration of pore structure. The moisture content profiles were measured using gamma ray spectrometer. The experimental results showed that, for both types of contact, the assumption of imperfect hydraulic contact is more appropriate than the widely used assumption, perfect hydraulic contact. Furthermore, the latter assumption may result in significant error in predicting moisture transport. The mismatching resistance was assumed in the study to explain the impact of imperfect hydraulic contact on the moisture transport. In addition, a numerical model was developed to calculate the moisture transport in multi-layered materials and was applied to estimate either the mismatching resistance of the interface or the resistance of air films. For a specimen without an interface the agreement between model prediction and experimental results was good. It was found that mismatching resistance of the interface varied with moisture content, the type of source material and the interface with the sink material. This study indicates that the bonded interface can be approximately treated as the natural contact interface, while the presence of an air gap between AAC and AAC could significantly increase the resistance to moisture transport from one material to another.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number46411
NPARC number20378927
Export citationExport as RIS
Report a correctionReport a correction
Record identifier39100fe7-0a03-4f34-9d68-3ca5668c4dd2
Record created2012-07-24
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)