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Publikācija: Impact of Biodeterioration on Structure and Composition of Waterlogged Foundation Piles from Riga Cathedral (1211 CE)

Publication Type Scientific article indexed in SCOPUS or WOS database
Funding for basic activity State funding for education
Defending: ,
Publication language English (en)
Title in original language Impact of Biodeterioration on Structure and Composition of Waterlogged Foundation Piles from Riga Cathedral (1211 CE), Latvia
Field of research 2. Engineering and technology
Sub-field of research 2.5 Materials engineering
Research platform None
Authors Ilze Irbe
Oskars Bikovens
Velta Fridrihsone
Mārcis Dzenis
Keywords Biodeterioration Heritage Archaeological wood Microorganisms Foundation piles
Abstract In this paper, a diagnostic evaluation of the state of the art of archaeological waterlogged foundation piles in Riga Cathedral (1211 CE) was carried out. Microscopic, chemical and instrumental methods were applied to study the impact of deterioration of piles leading to the deformations of the Cathedral building. Severe biodeterioration by microorganisms in the majority of pile samples was determined. Chemical analyses showed an extensive depletion of hemicellulose and cellulose sugars while lignin seemed to be unaffected. Restricted degradation of hemicellulose sugars –arabinose and galactose – was characteristic of bacterial degradation of wood. FTIR spectroscopy proved itself as a quick and efficient method for determination of changes in wood components in foundation piles in comparison with chemical method. The increased ash content (up to 70%) in waterlogged wood consisted of deposited salts, oxides and other inorganic compounds. The X-ray diffraction method determined the main inorganic impurities, including calcite, quartz, sodium magnesium silicate and muscovite.
DOI: 10.1016/j.jasrep.2018.11.002
Hyperlink: https://www.sciencedirect.com/science/article/pii/S2352409X18304279?via%3Dihub 
Reference Irbe, I., Bikovens, O., Fridrihsone, V., Dzenis, M. Impact of Biodeterioration on Structure and Composition of Waterlogged Foundation Piles from Riga Cathedral (1211 CE), Latvia. Journal of Archaeological Science: Reports, 2019, Vol. 23, No. 1, pp.196-202. ISSN 2352-409X. Available from: doi:10.1016/j.jasrep.2018.11.002
Additional information Citation count:
ID 28269