Influence of sample preparation on MX-80 bentonite microstructure

Michal Matusewicz, Veli-Matti Pulkkanen, Markus Olin

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

Compacted bentonite is to be used as a buffer material between waste canisters and the bedrock in the deep geological disposal of high-level nuclear waste in several countries. In spite of the fact that such large bentonite systems have long equilibration times, estimation of the material properties and performance in repository conditions is often based on short-term, laboratory-scale experiments. Sample-preparation procedures in these experiments may differ from the natural evolution of the bentonite in the repository, however, affecting the bentonite properties. The present study reports the influence on the structure of clay tactoids of four different preparation procedures of water-saturated, compacted MX-80 bentonite samples using four target dry bulk densities. Small-angle X-ray scattering was used to illustrate the differences between the samples. The different treatments of the bentonite samples may lead to different structural features. Clear differences between low-density samples prepared using different procedures were observed. The influence of the preparation methods was less, but still noticeable, for the high-density samples.
Original languageEnglish
Pages (from-to)189-195
JournalClay Minerals
Volume51
Issue number2
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

Fingerprint

Bentonite
sample preparation
bentonite
microstructure
Microstructure
repository
Radioactive Waste
dry density
X ray scattering
radioactive waste
bulk density
Materials properties
bedrock
Buffers
experiment
Experiments
scattering
clay
Water

Keywords

  • MX-80
  • bentonite
  • buffer
  • microstructure
  • repository conditions
  • small-angle X-ray scatterin

Cite this

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title = "Influence of sample preparation on MX-80 bentonite microstructure",
abstract = "Compacted bentonite is to be used as a buffer material between waste canisters and the bedrock in the deep geological disposal of high-level nuclear waste in several countries. In spite of the fact that such large bentonite systems have long equilibration times, estimation of the material properties and performance in repository conditions is often based on short-term, laboratory-scale experiments. Sample-preparation procedures in these experiments may differ from the natural evolution of the bentonite in the repository, however, affecting the bentonite properties. The present study reports the influence on the structure of clay tactoids of four different preparation procedures of water-saturated, compacted MX-80 bentonite samples using four target dry bulk densities. Small-angle X-ray scattering was used to illustrate the differences between the samples. The different treatments of the bentonite samples may lead to different structural features. Clear differences between low-density samples prepared using different procedures were observed. The influence of the preparation methods was less, but still noticeable, for the high-density samples.",
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author = "Michal Matusewicz and Veli-Matti Pulkkanen and Markus Olin",
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Influence of sample preparation on MX-80 bentonite microstructure. / Matusewicz, Michal; Pulkkanen, Veli-Matti; Olin, Markus.

In: Clay Minerals, Vol. 51, No. 2, 2016, p. 189-195.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Influence of sample preparation on MX-80 bentonite microstructure

AU - Matusewicz, Michal

AU - Pulkkanen, Veli-Matti

AU - Olin, Markus

N1 - Project code: 100411

PY - 2016

Y1 - 2016

N2 - Compacted bentonite is to be used as a buffer material between waste canisters and the bedrock in the deep geological disposal of high-level nuclear waste in several countries. In spite of the fact that such large bentonite systems have long equilibration times, estimation of the material properties and performance in repository conditions is often based on short-term, laboratory-scale experiments. Sample-preparation procedures in these experiments may differ from the natural evolution of the bentonite in the repository, however, affecting the bentonite properties. The present study reports the influence on the structure of clay tactoids of four different preparation procedures of water-saturated, compacted MX-80 bentonite samples using four target dry bulk densities. Small-angle X-ray scattering was used to illustrate the differences between the samples. The different treatments of the bentonite samples may lead to different structural features. Clear differences between low-density samples prepared using different procedures were observed. The influence of the preparation methods was less, but still noticeable, for the high-density samples.

AB - Compacted bentonite is to be used as a buffer material between waste canisters and the bedrock in the deep geological disposal of high-level nuclear waste in several countries. In spite of the fact that such large bentonite systems have long equilibration times, estimation of the material properties and performance in repository conditions is often based on short-term, laboratory-scale experiments. Sample-preparation procedures in these experiments may differ from the natural evolution of the bentonite in the repository, however, affecting the bentonite properties. The present study reports the influence on the structure of clay tactoids of four different preparation procedures of water-saturated, compacted MX-80 bentonite samples using four target dry bulk densities. Small-angle X-ray scattering was used to illustrate the differences between the samples. The different treatments of the bentonite samples may lead to different structural features. Clear differences between low-density samples prepared using different procedures were observed. The influence of the preparation methods was less, but still noticeable, for the high-density samples.

KW - MX-80

KW - bentonite

KW - buffer

KW - microstructure

KW - repository conditions

KW - small-angle X-ray scatterin

U2 - 10.1180/claymin.2015.051.2.06

DO - 10.1180/claymin.2015.051.2.06

M3 - Article

VL - 51

SP - 189

EP - 195

JO - Clay Minerals

JF - Clay Minerals

SN - 0009-8558

IS - 2

ER -