Utilisation of X-Ray computed microtomography for evaluation of iron sulphide distribution in roofing slate

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68145535%3A_____%2F16%3A00460700" target="_blank" >RIV/68145535:_____/16:00460700 - isvavai.cz</a>

Výsledek na webu

<a href="http://meetingorganizer.copernicus.org/EGU2016/EGU2016-2779.pdf" target="_blank" >http://meetingorganizer.copernicus.org/EGU2016/EGU2016-2779.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Utilisation of X-Ray computed microtomography for evaluation of iron sulphide distribution in roofing slate

Popis výsledku v původním jazyce

Roofing slate represents a traditional natural stone used for centuries for roofing and other construction applicationsnin various types of buildings. Quality roofing slate must be primarily splittable into large, thin and waterproofntiles. In addition, it must be stable in colour and resistant against weathering. The abundance of mineral phases thatnweather easily or minerals that are long-term unstable has the effect of reducing the durability of slates in exteriornconditions. One of the most problematic rock components, which are in a larger or smaller extent present in almostnall slates, are iron sulphides, such as pyrite, marcasite or pyrrhotite. Under common atmospheric conditions,nthese minerals tend to oxidise, which leads to the formation of limonite and sulphuric acid. As a consequence ofnthe origin of red-brown Fe oxyhydroxides, the undesirable colour changes of the slate may occur. But the mostnserious problem which occurs during this process is the changes in volume. This can cause disintegration of slatendepending on the form of the iron sulphide occurrence.nThe content and size distribution of iron sulphides in roofing slate is normally determined using the microscopicnanalysis in transmitted light, combined with the observation in reflected light. For quantitative determination ofniron sulphides in slate, the X-Ray powder diffraction is also often used. The results of the microscopic and X-Raynanalyses need to be mutually compared and should not differ fundamentally.nThis paper is focused on the assessing the possibility of application of the X-Ray computed microtomographyn(CT) as a new complementary technique enabling the analysis of content and size (volume) distribution ofniron sulphides in roofing slate.

Název v anglickém jazyce

Utilisation of X-Ray computed microtomography for evaluation of iron sulphide distribution in roofing slate

Popis výsledku anglicky

Roofing slate represents a traditional natural stone used for centuries for roofing and other construction applicationsnin various types of buildings. Quality roofing slate must be primarily splittable into large, thin and waterproofntiles. In addition, it must be stable in colour and resistant against weathering. The abundance of mineral phases thatnweather easily or minerals that are long-term unstable has the effect of reducing the durability of slates in exteriornconditions. One of the most problematic rock components, which are in a larger or smaller extent present in almostnall slates, are iron sulphides, such as pyrite, marcasite or pyrrhotite. Under common atmospheric conditions,nthese minerals tend to oxidise, which leads to the formation of limonite and sulphuric acid. As a consequence ofnthe origin of red-brown Fe oxyhydroxides, the undesirable colour changes of the slate may occur. But the mostnserious problem which occurs during this process is the changes in volume. This can cause disintegration of slatendepending on the form of the iron sulphide occurrence.nThe content and size distribution of iron sulphides in roofing slate is normally determined using the microscopicnanalysis in transmitted light, combined with the observation in reflected light. For quantitative determination ofniron sulphides in slate, the X-Ray powder diffraction is also often used. The results of the microscopic and X-Raynanalyses need to be mutually compared and should not differ fundamentally.nThis paper is focused on the assessing the possibility of application of the X-Ray computed microtomographyn(CT) as a new complementary technique enabling the analysis of content and size (volume) distribution ofniron sulphides in roofing slate.

Druh

O - Ostatní výsledky

CEP obor

JQ - Strojní zařízení a nástroje

OECD FORD obor

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Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů