Damage functions for the cold regions and their applications in hygrothermal simulations of different types of building structures

Kočí, Jan; Maděra, Jiří; Keppert, Martin; Černý, Robert

doi:10.1016/j.coldregions.2016.12.004

Cited by 29 publications

(14 citation statements)

References 26 publications

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“…On the other hand, exposure-based damage indicators are available, e.g. Time-of-Frost, Amount-of-Frozen-Water and Number of Freeze-Thaw Cycles [43], which though only relate to the exposure while the properties of the materials involved are not accounted for. Neither of these two approaches would allow assessing the impact of internal insulation on the potential frost damage, for example, implying that there is still much room for improvement with respect to potential frost damage estimation.…”

Section: Frost Damage Estimation Via Isoplethsmentioning

confidence: 99%

Towards a more representative assessment of frost damage to porous building materials

Feng

Roels

Janssen

2019

Building and Environment

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Current frost resistance tests rely on freeze-thaw cycling at very low frost temperatures and very high moisture contents, conditions that not readily reflect the spectrum of milder frost conditions met at actual exposure. This analysis performs freeze-thaw testing on four types of ceramic brick at frost temperatures from -2 °C to -20 °C and moisture saturation degrees from 0.1 to 1.0. The outcomes prove that both the frost temperature and the moisture content affect the extent of frost damage. The extension of frost test conditions proves to be more representative, and the application of frost damage isopleths is therefore suggested.

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Section: Frost Damage Estimation Via Isoplethsmentioning

confidence: 99%

Towards a more representative assessment of frost damage to porous building materials

Feng

Roels

Janssen

2019

Building and Environment

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“…Frost damage to building materials has been a central topic in the arena of building physics for decades, and resultantly there currently are multiple damage indicators quantifying existing or future frost damage. Examples are the Modified Winter Index, the Time-of-Frost function, the Amount-of-Frozen-Water or the Number of indicative Freeze-Thaw Cycles [8]. None of these however correctly represent the complex damage relations of Fig.…”

Section: Discussionmentioning

confidence: 99%

Impact of frost temperature and moisture content on frost damage to ceramic bricks

2019

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Reliable knowledge on how frost deteriorates building materials is necessary when assessing the hygrothermal performances of building facades. Unfortunately, the current frost-thaw testing methods do not offer dependable knowledge, as they only test at very low temperatures and very high moisture contents, contrary to the spectrum of milder conditions usually met in reality. This paper therefore studies frost damage to four ceramic bricks, with accele-rated frost-thaw tests at frost temperatures from -2 °C to -20 °C and moisture saturation degrees from 0.1 to 1.0. The ultrasonic method is used to quantify the resulting frost damage, with the Young’s modulus reduction as index. The actual frost temperature and moisture content affect the level of frost damage, an effect which is not recognised however in current frost-thaw test protocols.

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“…is the water content by volume, n (−) the porosity of the porous body, M (kg•mol −1 ) the molar mass of water vapor, R (J•K −1 •mol −1 ) is the universal gas constant, t (s) denotes time, and D g (s) is the global moisture transport function. e exact sources of hygric, thermal, and basic physical properties of building materials [24][25][26][27][28][29][30][31][32], which were used in the simulations as input parameters, are summarized in Table 3 in detail.…”

Section: Computational Simulationmentioning

confidence: 99%

“…e hygrothermal performance of studied building envelopes listed in Table 2 was evaluated using several damage functions, which were introduced recently [32].…”

Section: Applied Damage Functionsmentioning

confidence: 99%

Analysis of the Frost‐Induced Damage of Building Enclosures on the Territory of the Czech Republic

Kočí

Maděra

Pommer

et al. 2018

Advances in Materials Science and Engineering

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A comprehensive analysis of environmental loads across the Czech Republic in terms of frost-induced damage is presented. Computational simulation of hygrothermal performance of eleven characteristic types of building envelopes, composed of both contemporary and historical materials, is performed at first. The exterior boundary conditions of the computational model are defined by a set of weather data characterizing the environmental conditions in the Czech Republic, which are acquired from 64 weather stations. The results of hygrothermal simulations are assessed using several specific damage functions. In this way, the basic datasets for the frost damage analysis are obtained. Their application as input parameters of a specially developed correction procedure based on elevation makes them possible to obtain a continuous coverage of the geographic area of the Czech Republic. Finally, isopleths of the supposed frost damage are drawn, depending on the envelope type, and damage maps are produced which may help the engineers to enhance the building envelope design process. The presented results indicate the necessity of paying attention to local environmental loads in the building enclosure design process and reveal both critical and favorable locations from the point of view of frost-induced damage to buildings.

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Damage functions for the cold regions and their applications in hygrothermal simulations of different types of building structures

Cited by 29 publications

References 26 publications

Towards a more representative assessment of frost damage to porous building materials

Towards a more representative assessment of frost damage to porous building materials

Impact of frost temperature and moisture content on frost damage to ceramic bricks

Analysis of the Frost‐Induced Damage of Building Enclosures on the Territory of the Czech Republic

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