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Materials and Structures

, 33:194 | Cite as

Portable probe gas permeability: a non-destructive test for the in-situ characterisation of historic masonry

  • J. Válek
  • J. J. Hughes
  • P. J. M. Bartos
Technical Reports

Abstract

Architecturally appropriate and technically effective conservation and maintenance of historic masonry requires meaningful characterisation of existing materials. Sampling from important historic monuments is often not allowed, so there is a need for non-destructive in-situ test. Portable probe gas permeability, developed for use in petroleum reservoir studies, has the clear potential for application in practical conservation. In particular the application of gas permeametry in-situ may help in the study of weathering and decay of historic masonry materials. A pilot experiment was carried out to evaluate the applicability of steady state portable probe permeametry for the in-situ characterisation of historic natural sandstone masonry. The in-situ surface gas permeability of recently cleaned and original un-cleaned ashlar sandstone masonry was compared and the repeatability and variability of the measurements was evaluated. The method was found to be capable of assessing the permeability contrast of the cleaned and un-cleaned sandstone, though some limitations of the test method were identified.

Keywords

Sandstone Moisture Transport Seal Ring Stone Block Masonry Material 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Résumé

La préservation architecturale et technique appropriées ainsi que l’entretien des maçonneries de monuments historiques exigent la caractérisation pertinente des matériaux existants. Cependant, l’échantillonnage des monuments historiques n’étant pas souvent autorisé, un besoin urgent d’essais non-destructifs in-situ s’est fait sentir. La sonde portable à perméabilité de gaz, développée pour son utilisation dans des études de réservoirs de pétrole, possède un potentiel adéquat quant à l’application pratique de la conservation. L’application in-situ de la perméabilité de gaz permet d’étudier plus particulièrement l’effet du climat et de la détérioration des matériaux de ces maçonneries anciennes. Une expérience pilote a été effectué pour évaluer l’application de la sonde portable à perméabilité afin de caractériser une maçonnerie à base de grès. Cet essai a permis de comparer la perméabilité de gaz in-situ d’une surface récemment nettoyée à celle d’une surface originale non-nettoyée de la maçonnerie en grès. La répétabilité et la variabilité de ces mesures ont été évaluées. Ainsi, même, si l’étude a mis en évidence certaines limites de la méthode, celle-ci a cependant montré la capacité d’évaluer le contraste de la perméabilité du grès nettoyé et non-nettoyé.

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Copyright information

© RILEM 2000

Authors and Affiliations

  • J. Válek
    • 1
  • J. J. Hughes
    • 1
  • P. J. M. Bartos
    • 1
  1. 1.Advanced Concrete and Masonry CentreUniversity of PaisleyPaisleyScotland

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