Precipitation of calcium compounds onto rock surfaces in water with cementitious material
| Autor: | Yoshitaka Nara, Akimasa Nakao, Kazutoshi Shibuya, Hiroto Uchida, Koki Kashiwaya, Yusaku Hamada |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010506 paleontology
Precipitation (chemistry) Scanning electron microscope Weight change Metallurgy Radioactive waste Precipitation 010502 geochemistry & geophysics Energy dispersion X-ray spectroscopy 01 natural sciences Purified water Geochemistry and Petrology Rock Calcium Compounds Calcium compound Cementitious Geology 0105 earth and related environmental sciences |
| Zdroj: | Carbonates and Evaporites. 34:1003-1020 |
| ISSN: | 1878-5212 0891-2556 |
| DOI: | 10.1007/s13146-018-0471-9 |
| Popis: | In this study, the precipitation of minerals onto rock surfaces was investigated to consider whether sealing of pores and cracks in rock can be accelerated. Cylindrical specimens were prepared and then kept in purified water with powders of high-strength and ultra-low-permeability concrete (HSULPC), which will be used to confine transuranic wastes in Japan. Then, the rock specimens were weighed and the surfaces of rock specimens were inspected under a microscope. It was recognized that precipitation occurred on the surface of the rock specimens. It was also shown that precipitation did not occur on rock specimens kept in water without HSULPC. The weight of all specimens stored in HSULPC increased, and the observed weight change was larger for rocks with higher porosities. It is concluded that precipitation of minerals occurs on the rock surface when the rock is kept in water with HSULPC powders. From the results obtained in this study, it is suggested that the sealing of pores and cracks in rock can be accelerated by the precipitation of calcium compounds using HSULPC. It is concluded that HSULPC is useful for underground radioactive waste disposal. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink