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Bulletin of the International Association of Engineering Geology - Bulletin de l'Association Internationale de Géologie de l'Ingénieur : Volume 63, Issue 4, December 2004

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Salt damage to brick kiln walls in Japan: spatial and seasonal variation of efflorescence and moisture content

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Salt damage to brick kiln walls in Japan: spatial and seasonal variation of efflorescence and moisture content

Content Provider	Springer Nature Link
Author	Matsukura, Yukiri Oguchi, Chiaki T. Kuchitsu, buaki
Copyright Year	2004
Abstract	To clarify the mechanism of salt fretting of a brick building, monthly observations were made over one year at a two-storey brick kiln in central Japan. Products of weathering that had fallen were collected and weighed; salts were identified using XRD and the moisture content of the brick was measured at its surface using a portable infrared optical moisture meter. Gypsum (CaSO4·2H2O) was found at the bottom of the first floor wall in the warm and humid season. Thenardite (Na2SO4) is dominant on the first floor wall; it is abundant in the cold and dry season but sparse in the warm and humid season. Magnesium sulphate is dominant on the second floor wall; epsomite (MgSO4·7H2O) was observed in the dry-to-wet season and hexahydrite (MgSO4·6H2O) in the wet-to-dry season. Seasonal changes in salt abundance result from the temperature dependence of the solubilities and equilibrium relative humidities (ERH) of each salt. The amount of brick decay material due to salt weathering is much greater from the second floor wall than from the first floor wall and is greater from spring to the end of summer. These seasonal and spatial variations of the rate of brick decay can be explained by a combination of factors: (1) the types of salt, (2) efflorescence or sub-florescence and (3) salt deliquescence.Afin de comprendre les processus d’endommagement des monuments en briques par le sel, des observations mensuelles ont été faites durant une année sur un four en brique comportant deux niveaux, au Japon. Les produits d’altération qui étaient tombés ont été ramassés et pesés. Les sels ont été identifiés par diffractométrie RX et l’humidité des briques a été mesurée en surface à l’aide d’un appareil optique à infrarouge. Du Gypse (CaSO4, 2H2O) a été trouvé à la base du premier niveau durant la saison chaude et humide. De la Thénardite (Na2SO4) est présente de façon importante sur le mur du premier niveau. Elle est abondante pendant la saison froide et sèche mais éparse durant la saison chaude et humide. Des sulfates de magnésium sont abondants sur le mur du deuxième niveau. De l’Epsomite (MgSO4, 7H2O) a été observée durant l’intersaison sèche à humide et de l’Hexahydrite (MgSO4, 6H2O) durant l’intersaison humide à sèche. Les variations saisonnières des teneurs en sels proviennent des solubilités et des humidités relatives imposées par chaque type de sel, qui sont fonctions de la température. La quantité de produits d’altération des briques dus à l’action des sels est beaucoup plus importante pour le deuxième niveau que pour le premier. Elle est par ailleurs plus importante du printemps à la fin de l’été. Ces variations saisonnières et spatiales du taux d’altération des briques peuvent être expliquées par une combinaison de facteurs : (1) le type de sel en présence, (2) la nature des efflorescences et sub-florescences, (3) la déliquescence des sels.
Starting Page	167
Ending Page	176
Page Count	10
File Format	PDF
ISSN	14359529
Journal	Bulletin of the International Association of Engineering Geology - Bulletin de l'Association Internationale de Géologie de l'Ingénieur
Volume Number	63
Issue Number	2
e-ISSN	14359537
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-05-25
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Altération par les sels Efflorescences salines Monuments en brique Humidité Japon
Content Type	Text
Resource Type	Article
Subject	Geology Geotechnical Engineering and Engineering Geology

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