Heat and Moisture Transport and Storage Parameters of Bricks Affected by the Environment

  • Václav Kočí
  • Monika Čáchová
  • Dana Koňáková
  • Eva Vejmelková
  • Miloš Jerman
  • Martin Keppert
  • Jiří Maděra
  • Robert Černý
Article
  • 66 Downloads

Abstract

The effect of external environment on heat and moisture transport and storage properties of the traditional fired clay brick, sand–lime brick and highly perforated ceramic block commonly used in the Czech Republic and on their hygrothermal performance in building envelopes is analyzed by a combination of experimental and computational techniques. The experimental measurements of thermal, hygric and basic physical parameters are carried out in the reference state and after a 3-year exposure of the bricks to real climatic conditions of the city of Prague. The obtained results showed that after 3 years of weathering the porosity of the analyzed bricks increased up to five percentage points which led to an increase in liquid and gaseous moisture transport parameters and a decrease in thermal conductivity. Computational modeling of hygrothermal performance of building envelopes made of the studied bricks was done using both reference and weather-affected data. The simulated results indicated an improvement in the annual energy balances and a decrease in the time-of-wetness functions as a result of the use of data obtained after the 3-year exposure to the environment. The effects of weathering on both heat and moisture transport and storage parameters of the analyzed bricks and on their hygrothermal performance were found significant despite the occurrence of warm winters in the time period of 2012–2015 when the brick specimens were exposed to the environment.

Keywords

Bricks Hygric properties Hygrothermal performance Thermal properties Weathering 

Notes

Acknowledgment

This research has been supported by the Czech Science Foundation, under Project No. P105/12/G059.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Materials Engineering and Chemistry, Faculty of Civil EngineeringCzech Technical University in PraguePragueCzech Republic

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