Estimation of the linseed oil content in historic lime mortar

Bauerová, Pavla; Kracík-Štorkánová, Magdalena; Mácová, Petra; Reiterman, Pavel; Vejmelková, Eva; Keppert, Martin

doi:10.1007/s10973-022-11792-9

Cited by 3 publications

(4 citation statements)

References 42 publications

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“…6). It has been experimentally proved substantial portion of thermally induced oil disintegration resulting in CO2 and water release takes place in this region as well [165], overlapping portlandite decomposition peak. Thus, the intensity of "portlandite" peak is "amplified" by the contribution of oil decomposition.…”

Section: Thermal Analysis (Tg/dtg-ega)mentioning

confidence: 92%

“…Thermal decomposition of the oil therefore accounts for 27.9 % of the mass change in the temperature range studied. At the same time, it was found that at higher temperatures there is no significant mass change due to oil decomposition anymore (see Section 7 or [165]). Thus, the figure of 27.9% represents the total contribution of oil to the mass loss of the sample.…”

Section: Thermal Analysis (Tg/dtg-ega)mentioning

confidence: 93%

“…23), which show that even in the case of the Bittner mortar, there is a significant release of the main mass fractions attributed to oil decomposition (m/z 55 and 95) at 450 °C (i.e. at the same temperature as the potential release of CO2 from portlandite if it were present in the sample) [165].…”

Section: Thermal Analysis (Tg/dtg-ega)mentioning

confidence: 96%

“…This leads to the inhibition of calcium carbonate growth [188]. Thus, linseed oil slows down the carbonation process [165], [188], [192]- [194] and the mortar remains plastic for a longer time. This also explains the detection of non-carbonated portlandite in the Peluněk, Beneš and Sladkovský bedding mortars (Tab.…”

Section: Gas Chromatographymentioning

confidence: 99%

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Characterisation of Czech Modern Mosaic Mortars

Bauerová

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The main goal of this thesis was to characterise mosaic fixing mortars of 27 mosaics from the late 19th century to the late 20th century. The mortars were examined by SEM—EDS, XRD, light and light polarising microscopy, thermal analysis coupled with EGA-MS, FTIR and gas chromatography. The mosaics studied come from different mosaic workshops and periods but all of them relate to the present-day Czech Republic. Although the analysed set is small, some trends and preferences in the use of materials can be traced in the works of different workshops. Portable sepulchral mosaics designed by Neuhauser/ Tiroler Glasmalerei workshop, the first mosaic studio operating in the Czech Lands, follow a traditional 16th century technology – bedding mortars based on lime binder + marble aggregates + high amount of linseed oil (up to almost 40%) as a plasticizer. In order to fix façade mosaics, the company applied hydraulic mortars made of lime, marble dust, random waste glass splinters and reactive ceramic aggregates (bricks, chamotte) or Portland cement based materials with carbonate aggregates. A mixture of lime and Portland cement appears to be a common binder of Josef Pfefferle´s mosaics. The works by the first Czech local mosaicist Viktor Foerster consist of sand, early Portland cement or mixtures of Portland cement and lime and crushed bricks or gypsum. Foerster´s wife Marie used blended Portland cement with blast furnace slag grains to fix the vault mosaic of the Slavín crypt. The analysed bedding mortars from mosaics produced by other early 20th century mosaic workshops also document the on-going transition from traditional calcium carbonate aggregates and cocciopesto technique to the application of sand and Portland cement based mortars. Portland cement was the main compound in the binders of the studied “socialistic” mosaics of the latter half of the 20th century. This work brought evidence of a common use of blended cements containing granulated blast furnace slag. Linseed oil turned out to be an important compound of some late 19th/ early 20th century mortars. Therefore, a methodology of linseed oil content estimation in the historic mortars was proposed based of the three methods (TG coupled with EGA-MS and TOC). The approach based on EGA-MS (identification and analysis of m/z 95 signal corresponding to “oil-specific” [C7H11]+ ion), developed on a set of model mortars and tested on authentic mosaic mortars´ samples, provided the most satisfactory results.

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Section: Thermal Analysis (Tg/dtg-ega)mentioning

confidence: 92%

Section: Thermal Analysis (Tg/dtg-ega)mentioning

confidence: 93%

Section: Thermal Analysis (Tg/dtg-ega)mentioning

confidence: 96%