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Specific surface area determinations on intact drillcores and evaluation of extrapolation methods for rock matrix surfaces
KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk apparatteknik.
KTH, Skolan för industriell teknik och management (ITM), Industriell ekologi.ORCID-id: 0000-0002-4530-3414
KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk apparatteknik.
2009 (engelsk)Inngår i: Journal of Contaminant Hydrology, ISSN 0169-7722, E-ISSN 1873-6009, Vol. 110, nr 1-2, s. 1-8Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Permanent storage of spent nuclear fuel in crystalline bedrock is investigated in several countries. For this storage scenario, the host rock is the third and final barrier for radionuclide migration. Sorption reactions in the crystalline rock matrix have strong retardative effects on the transport of radionuclides. To assess the barrier properties of the host rock it is important to have sorption data representative of the undisturbed host rock conditions. Sorption data is in the majority of reported cases determined using crushed rock. Crushing has been shown to increase a rock samples sorption capacity by creating additional surfaces. There are several problems with such an extrapolation. In studies where this problem is addressed, simple models relating the specific surface area to the particle size are used to extrapolate experimental data to a value representative of the host rock conditions. In this article, we report and compare surface area data of five size fractions of crushed granite and of 100 mm long drillcores as determined by the Brunauer Emmet Teller (BET)-method using N-2-gas. Special sample holders that could hold large specimen were developed for the BET measurements. Surface area data on rock samples as large as the drillcore has not previously been published. An analysis of this data show that the extrapolated value for intact rock obtained from measurements on crushed material was larger than the determined specific surface area of the drillcores, in some cases with more than 1000%. Our results show that the use of data from crushed material and current models to extrapolate specific surface areas for host rock conditions can lead to over estimation interpretations of sorption ability. The shortcomings of the extrapolation model are discussed and possible explanations for the deviation from experimental data are proposed.

sted, utgiver, år, opplag, sider
2009. Vol. 110, nr 1-2, s. 1-8
Emneord [en]
BET, Specific surface area, Crystalline rock, Disturbed zone, Rock matrix, MINERALS, SORPTION, SAMPLES, DIFFUSIVITY, STRONTIUM, POROSITY, GRANITE, CESIUM, ZONE
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-13629DOI: 10.1016/j.jconhyd.2009.05.003ISI: 000271836600001PubMedID: 19781807Scopus ID: 2-s2.0-71749092641OAI: oai:DiVA.org:kth-13629DiVA, id: diva2:326246
Merknad
QC 20100622Tilgjengelig fra: 2010-06-22 Laget: 2010-06-22 Sist oppdatert: 2020-03-09bibliografisk kontrollert
Inngår i avhandling
1. New Methods for the Determination of Sorption Capacities and Sorption-Related Properties of Intact Rock
Åpne denne publikasjonen i ny fane eller vindu >>New Methods for the Determination of Sorption Capacities and Sorption-Related Properties of Intact Rock
2009 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
Stockholm: KTH, 2009. s. viii, 77
Serie
Trita-CHE-Report, ISSN 1654-1081 ; 2009:19
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-10636 (URN)978-91-7415-332-3 (ISBN)
Disputas
2009-06-12, K1, KTH, Teknikringen, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad
QC 20100622Tilgjengelig fra: 2009-06-08 Laget: 2009-06-08 Sist oppdatert: 2011-10-10bibliografisk kontrollert

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