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Modelling time-to-cracking in brick masonry with corroding bed joint reinforcement

Larsson, Oskar LU and Molnar, Miklos LU (2014) 9th International Masonry Conference In 9th International Masonry Conference
Abstract
Clay brick facades often include bed joint reinforcement, especially over windows and other openings in the façade, which may corrode due to degradation from climatic exposure. Removal of corroded bed joint reinforcement from such facades is an invasive and costly measure. Heavily
damaged reinforcement must be removed for either structural, durability or aesthetic reasons. Parts of the bed joint reinforcement can however be left in the façade, if it can be shown that the risk for future damage is acceptably low. This will significantly reduce the amount of work needed and the retrofitting
costs. A dose-response model for prediction of corrosion induced cracking in reinforced brick masonry is presented, with relative humidity,... (More)
Clay brick facades often include bed joint reinforcement, especially over windows and other openings in the façade, which may corrode due to degradation from climatic exposure. Removal of corroded bed joint reinforcement from such facades is an invasive and costly measure. Heavily
damaged reinforcement must be removed for either structural, durability or aesthetic reasons. Parts of the bed joint reinforcement can however be left in the façade, if it can be shown that the risk for future damage is acceptably low. This will significantly reduce the amount of work needed and the retrofitting
costs. A dose-response model for prediction of corrosion induced cracking in reinforced brick masonry is presented, with relative humidity, temperature and oxygen supply in the vicinity of the reinforcement as influencing parameters. Corrosion depth, constituting the dose, is modelled by integration of the
effect of corrosion rate with respect to time. To describe the dependence of corrosion rate on the influencing parameters, models from the field of concrete research are used. The response, which can be seen as a limit state, is the corrosion depth required to create a crack due to tensile stresses generated by corrosion products. Due to scarcity of experimental data from the field of reinforced brick masonry, the critical corrosion depth is established using empirical data from the field of concrete research. To address this lack of a well-defined limit state, tests will be performed on clay brick specimens in a later part of the research project. The model’s ability to predict time-to-cracking
is demonstrated by comparison with data from field observations. (Less)
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organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Brick masonry, reinforcement corrosion, dose-response model, corrosion rate, carbonation, time-to-cracking, KstrMasonry, KstrReliability
in
9th International Masonry Conference
pages
12 pages
conference name
9th International Masonry Conference
language
English
LU publication?
yes
id
66916192-53c2-4502-9aaa-5530b2048eeb (old id 4587034)
date added to LUP
2014-08-15 09:35:36
date last changed
2016-10-31 11:32:40
@misc{66916192-53c2-4502-9aaa-5530b2048eeb,
  abstract     = {Clay brick facades often include bed joint reinforcement, especially over windows and other openings in the façade, which may corrode due to degradation from climatic exposure. Removal of corroded bed joint reinforcement from such facades is an invasive and costly measure. Heavily <br/>damaged reinforcement must be removed for either structural, durability or aesthetic reasons. Parts of the bed joint reinforcement can however be left in the façade, if it can be shown that the risk for future damage is acceptably low. This will significantly reduce the amount of work needed and the retrofitting <br/>costs. A dose-response model for prediction of corrosion induced cracking in reinforced brick masonry is presented, with relative humidity, temperature and oxygen supply in the vicinity of the reinforcement as influencing parameters. Corrosion depth, constituting the dose, is modelled by integration of the <br/>effect of corrosion rate with respect to time. To describe the dependence of corrosion rate on the influencing parameters, models from the field of concrete research are used. The response, which can be seen as a limit state, is the corrosion depth required to create a crack due to tensile stresses generated by corrosion products. Due to scarcity of experimental data from the field of reinforced brick masonry, the critical corrosion depth is established using empirical data from the field of concrete research. To address this lack of a well-defined limit state, tests will be performed on clay brick specimens in a later part of the research project. The model’s ability to predict time-to-cracking <br/>is demonstrated by comparison with data from field observations.},
  author       = {Larsson, Oskar and Molnar, Miklos},
  keyword      = {Brick masonry,reinforcement corrosion,dose-response model,corrosion rate,carbonation,time-to-cracking,KstrMasonry,KstrReliability},
  language     = {eng},
  pages        = {12},
  series       = {9th International Masonry Conference},
  title        = {Modelling time-to-cracking in brick masonry with corroding bed joint reinforcement},
  year         = {2014},
}