Experimental and computational analysis of interface resistances in multi-layered systems of building materials

Title: Experimental and computational analysis of interface resistances in multi-layered systems of building materials
Author(s): Z. Pavlík, J. Žumár, J. Kočí, L. Fiala, J. Maděra and R. Černý
Paper category : conference
Book title: International RILEM Conference on Advances in Construction Materials Through Science and Engineering
Editor(s): Christopher Leung and K.T. WAN
ISBN: 978-2-35158-116-2
e-ISBN: 978-2-35158-117-9
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 923 - 930
Total Pages: 8
Nb references: 11
Language: English

Abstract: Heat and water vapor transport across interfaces in brick masonry is analyzed in the paper. Because of the imperfect hydraulic and thermal contact, semi-scale experiment is designed in order to evaluate the effect of interface resistances between the ceramic bricks and mortar. Within the experimental testing, the water vapor transport in fragment of a brick wall is simulated at constant temperature conditions. The dimensions of the investigated structure are close to a real wall but the accuracy and resolution of applied measuring techniques is the same as in laboratory experiments. Combined relative humidity and temperature mini-sensors are used to measure temperature and relative humidity profiles which provide information on the properties of the interface between the walling material and mortar. This data makes possible to identify the interface transfer coefficients. For that purpose, computational analysis of measured data is performed using computer code HEMOT based on finite element method. The GRADE algorithm is used for optimization of surface and interface water vapour transfer coefficients.
The results of computational simulations can be then used in hygrothermal analysis of masonry structures using HAM (Heat, Air, Moisture) transport models, adding significantly to the accuracy of models’ predictions.

Online publication: 2011-10-31
Publication type : full_text
Public price (Euros): 0.00