A new method for evaluating the condition of fired clay bricks: preliminary results

Inge Rörig-Dalgaard, A. Elena Charola

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

The present study proposes a new method to evaluate the condition of used fired clay bricks, which may prove useful for determining their future lifespan. Prior to firing, the unfired clay bricks may contain a significant amount of calcite (CaCO3). A major part of the CaCOwill turn into CaO during
firing, then in presence of water (H2O) to Ca(OH)2, and finally, into CaCO3 by reaction with carbon dioxide (CO2) in the air. Therefore, the presence and amount of the diverse compounds mentioned in the brick may change significantly the pH value of the matrix. Thus, pH is proposed as a tracer to determine to what depth sufficient access of H2O and CO2
is possible to allow these various reactions.
Access of H2O and COis promoted by cracks or increased porosity in the outer layers and therefore can serve to reveal these areas. This new method was implemented on two different bricks types, both new and naturally exposed fired clay bricks (1 year and 11 years in construction respectively)
and was found to be reliable.
Original languageEnglish
Title of host publicationMonument future: decay and conservation of stone : Proceedings of the 14th international congress on the deterioration and conservation of stone
PublisherMitteldeutscher Verlag
Publication date2020
Pages49-54
Publication statusPublished - 2020
Event14th International congress on the deterioration and conservation of stone - Göttingen, Germany
Duration: 7 Sep 202012 Sep 2020
Conference number: 14

Conference

Conference14th International congress on the deterioration and conservation of stone
Number14
Country/TerritoryGermany
CityGöttingen
Period07/09/202012/09/2020

Keywords

  • Fired clay bricks
  • pH
  • Lime

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