5-year chemico-physical evolution of concrete–claystone interfaces, Mont Terri rock laboratory (Switzerland)
| Autor: | Urs Mäder, Babara Lothenbach, Masahito Shibata, Veerle Cloet, Stéphane Gaboreau, Catherine Lerouge, Andreas Jenni, Francis Claret, Tsubasa Otake, Yukinobu Kimura, Masaaki Fukaya, Satoru Miyoshi |
|---|---|
| Přispěvatelé: | Université de Bern (INSTITUT DE GéOLOGIE), Université de Bern, Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), NAGRA (NAGRA), NAGRA, Institute of Geological Sciences [Bern], University of Bern |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Cement
Aggregate (composite) 010504 meteorology & atmospheric sciences 0211 other engineering and technologies Mineralogy Radioactive waste [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Geology 02 engineering and technology 010501 environmental sciences 01 natural sciences Matrix (geology) Types of concrete chemistry.chemical_compound chemistry 021105 building & construction 550 Earth sciences & geology [SDE]Environmental Sciences Carbonate Cementitious Porosity ComputingMilieux_MISCELLANEOUS 0105 earth and related environmental sciences |
| Zdroj: | Swiss Journal of Geosciences Swiss Journal of Geosciences, Springer, 2017, 110 (1), pp.307-327. ⟨10.1007/s00015-016-0240-5⟩ Mäder, Urs; Jenni, Andreas; Lerouge, Cathérine; Gaboreau, Stephane; Miyoshi, Satoru; Kimura, Yukinobu; Cloet, Veerle; Fukaya, Masaaki; Claret, Francis; Otake, Tsubasa; Shibata, Masahito; Lothenbach, Babara (2017). 5-year chemico-physical evolution of concrete–claystone interfaces, Mont Terri rock laboratory (Switzerland). Swiss journal of geosciences, 110(1), pp. 307-327. Springer 10.1007/s00015-016-0240-5 Mont Terri Rock Laboratory, 20 Years ISBN: 9783319704579 |
| ISSN: | 1661-8726 1661-8734 |
| DOI: | 10.1007/s00015-016-0240-5⟩ |
| Popis: | The Cement–Opalinus Clay Interaction (CI) Experiment at the Mont Terri rock laboratory is a long-term passive diffusion–reaction experiment between contrasting materials of relevance to engineered barrier systems/near-field for deep disposal of radioactive waste in claystone (Opalinus Clay). Reaction zones at interfaces of Opalinus Clay with two different types of concrete (OPC and “low-pH”/ESDRED) were examined by sampling after 2.2 and 4.9 years. Analytical methods included element mapping (SEM, EPMA), select spot analysis (EDAX), 14C-MMA impregnation for radiography, and powder methods (IR, XRD, clay-exchanger characterisation) on carefully extracted miniature samples (mm). The presence of aggregate grains in concrete made the application of all methods difficult. Common features are a very limited extent of reaction within claystone, and a distinct and regularly zoned reaction zone within the cement matrix that is more extensive in the low-alkali cement (ESDRED). Both interfaces feature a de-calcification zone and overprinted a carbonate alteration zone thought to be mainly responsible for the observed porosity reduction. While OPC shows a distinct sulphate enrichment zone (indicative of ingress from Opalinus Clay), ESDRED displays a wide Mg-enriched zone, also with claystone pore-water as a source. A conclusion is that substitution of OPC by low-alkali cementitious products is not advantageous or necessary solely for the purpose of minimizing the extent of reaction between claystone and cementitious materials. Implications for reactive transport modelling are discussed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink