Hygric Resistance in Multilayer Building Materials – A Prevision New Methodology

• Type: Article in International Conference Proceedings Book
• Date: 2019

Authors

Ana Sofia Guimarães (Author) FEUP; João M. P. Q. Delgado (Author) FEUP; António Azevedo (Author) Other; Isabel Martins Ribeiro (Author) FEUP; Vasco Peixoto de Freitas (Author) FEUP

Conference proceedings International

Title: 4TH CENTRAL EUROPEAN SYMPOSIUM ON BUILDING PHYSICS (CESBP 2019)

Pages: 1-6

4th Central European Symposium on Building Physics (CESBP)

Czech Tech Univ Prague, Fac Civil Engn, Prague, CZECH REPUBLIC, SEP 02-05, 2019

Other information

DOI: 10.1051/matecconf/201928202017

Abstract (EN): This work presents the results of an experimental campaign in order to determine the hygric resistance in multilayered building components, with different interface types. The results show a slowing of the wetting process due to the interfaces hygric resistance. The samples with hydraulic contact interface (cement mortar) present lower absorption rate than the samples with lime mortar. The influence of air space between layers was also demonstrated, i.e., the air space interfaces increase the coefficients of capillary significantly, as the distances from the contact with water increase. The hygric resistance was calculated by three different methods: gravimetric and gamma-ray methods, and the new methodology proposed, an automatic calculation method without human opinion/criteria. The “knee point” was detected, numerically, in water absorption curves and the moisturedependent interface resistance was quantified and validated for transient conditions. The methodology proposed to detect the “knee point” can be also used in the future for different multilayer materials with an interface, in order to obtain more correct hygric resistance values to be used in future numerical simulations.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6