Thermal loading of smectite-rich rocks: Natural processes vs. laboratory experiments

Autor:	E. Jelínek, Irena Kolaříková, Radek Hanus, Richard Přikryl
Rok vydání:	2005
Předmět:	Mineralogy Geology Weathering Silicate chemistry.chemical_compound Montmorillonite chemistry Geochemistry and Petrology Differential thermal analysis Bentonite Cation-exchange capacity Sedimentary rock Clay minerals
Zdroj:	Applied Clay Science. 29:215-223
ISSN:	0169-1317
DOI:	10.1016/j.clay.2005.01.002
Popis:	Changes of physico-chemical properties of smectite-rich rocks (used as an engineered barrier in the nuclear waste repository) are studied. Two different genetic types of clays are evaluated—bentonite representing the residual weathering type and sedimentary montmorillonite-rich clay. Cation exchange capacity and specific surface area were determined for bulk samples (after heating experiments) and results were compared to a natural analogue (Ishirini deposit, Libya). Structural changes of clay minerals were studied using XRD, TG and DTA. Two main transformation processes (illitization and kaolinization) of smectite-rich rocks followed by deterioration of physico-chemical properties were observed after heat treatment. Cation exchange capacity drops significantly with increasing temperature and so does Smicro. However, SBET values increased when heat treatment was applied.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b2f10f5be80a209e6e9f1707ba139c87 https://doi.org/10.1016/j.clay.2005.01.002 Zobrazit plný text záznamu Full Text from ScienceDirect