Alteration of Bentonite Reacted with Cementitious Materials for 5 and 10 Years in the Mont Terri Rock Laboratory (CI Experiment)
| Autor: | Yasutaka Watanabe, Shingo Yokoyama, Andreas Jenni, Urs Mäder, Daisuke Minato, Misato Shimbashi |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
lcsh:QE351-399.2
Materials science 010504 meteorology & atmospheric sciences Mineralogy alteration engineering.material 010502 geochemistry & geophysics 01 natural sciences law.invention chemistry.chemical_compound law 550 Earth sciences & geology 0105 earth and related environmental sciences alkaline conditions Calcite lcsh:Mineralogy Mineral bentonite Geology Geotechnical Engineering and Engineering Geology Cristobalite cementitious materials Portland cement cement–clay interaction Montmorillonite chemistry Bentonite Illite engineering Cementitious |
| Zdroj: | Minerals Volume 11 Issue 3 Minerals, Vol 11, Iss 251, p 251 (2021) Yokoyama, Shingo; Shimbashi, Misato; Minato, Daisuke; Watanabe, Yasutaka; Jenni, Andreas; Mäder, Urs (2021). Alteration of Bentonite Reacted with Cementitious Materials for 5 and 10 Years in the Mont Terri Rock Laboratory (CI Experiment). Minerals, 11(3), p. 251. MDPI 10.3390/min11030251 |
| ISSN: | 2075-163X |
| DOI: | 10.3390/min11030251 |
| Popis: | The cement–clay interaction (CI) experiment was carried out at the Mont Terri rock laboratory to complement the current knowledge on the influence that cementitious materials have on Opalinus Clay (OPA) and bentonite (MX). Drill cores including the interface of OPA, concrete (LAC = low-alkali binder, and OPC = ordinary Portland cement), and MX, which interacted for 4.9 and 10 years, were successfully retrieved after drilling, and detailed analyses were performed to evaluate potential mineralogical changes. The saturated compacted bentonites in core samples were divided into ten slices, profiling bentonite in the direction towards the interface, to evaluate the extent and spatial variation of the mineralogical alteration of bentonite. Regarding the mineral compositions of bentonite, cristobalite was dissolved within a range of 10 mm from the interface in both LAC-MX and OPC-MX, while calcite precipitated near the interface for OPC-MX. In LAC-MX and OPC-MX, secondary products containing Mg (e.g., M-S-H) also precipitated within 20 mm of the interface. These alterations of bentonite developed during the first 4.9 years, with very limited progress observed for the subsequent 5 years. Detectable changes in the mineralogical nature of montmorillonite (i.e., the formation of illite or beidellite, increase in layer charge) did not occur during the 10 years of interaction. |
| Databáze: | OpenAIRE |
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