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

Inge Rörig-Dalgaard; A. Elena Charola

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

Inge Rörig-Dalgaard
, A. Elena Charola

Smithsonian Institution

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-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 CaCO₃will 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 CO₂is 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 language	English
Title of host publication	Monument future: decay and conservation of stone : Proceedings of the 14th international congress on the deterioration and conservation of stone
Publisher	Mitteldeutscher Verlag
Publication date	2020
Pages	49-54
Publication status	Published - 2020
Event	14th International congress on the deterioration and conservation of stone - Göttingen, Germany Duration: 7 Sept 2020 → 12 Sept 2020 Conference number: 14

Conference

Conference	14th International congress on the deterioration and conservation of stone
Number	14
Country/Territory	Germany
City	Göttingen
Period	07/09/2020 → 12/09/2020

Keywords

Fired clay bricks
pH
Lime

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@inproceedings{d49bdaf764b5472daa85d65f80f16335,

title = "A new method for evaluating the condition of fired clay bricks: preliminary results",

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 CaCO3 will 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 CO2 is 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.",

keywords = "Fired clay bricks, pH, Lime",

author = "Inge R{\"o}rig-Dalgaard and Charola, \{A. Elena\}",

year = "2020",

language = "English",

pages = "49--54",

booktitle = "Monument future: decay and conservation of stone",

publisher = "Mitteldeutscher Verlag",

note = "14th International congress on the deterioration and conservation of stone ; Conference date: 07-09-2020 Through 12-09-2020",

}

Rörig-Dalgaard, I & Charola, AE 2020, A new method for evaluating the condition of fired clay bricks: preliminary results. in Monument future: decay and conservation of stone : Proceedings of the 14th international congress on the deterioration and conservation of stone. Mitteldeutscher Verlag, pp. 49-54, 14th International congress on the deterioration and conservation of stone, Göttingen, Germany, 07/09/2020.

A new method for evaluating the condition of fired clay bricks: preliminary results. / Rörig-Dalgaard, Inge; Charola, A. Elena.
Monument future: decay and conservation of stone : Proceedings of the 14th international congress on the deterioration and conservation of stone. Mitteldeutscher Verlag, 2020. p. 49-54.

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

TY - GEN

T1 - A new method for evaluating the condition of fired clay bricks: preliminary results

AU - Rörig-Dalgaard, Inge

AU - Charola, A. Elena

N1 - Conference code: 14

PY - 2020

Y1 - 2020

N2 - 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 CaCO3 will 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 CO2 is 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.

AB - 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 CaCO3 will 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 CO2 is 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.

KW - Fired clay bricks

KW - pH

KW - Lime

M3 - Article in proceedings

SP - 49

EP - 54

BT - Monument future: decay and conservation of stone

PB - Mitteldeutscher Verlag

T2 - 14th International congress on the deterioration and conservation of stone

Y2 - 7 September 2020 through 12 September 2020

ER -

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

Abstract

Conference

Keywords

OpenUrl availability

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