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Precipitation of Calcium Compounds on Rock Kept in Calcium Hydroxide SolutionNormal access

Authors: Y. Nara and Y. Hamada
Event name: Fourth Sustainable Earth Sciences Conference
Session: Cross-disciplinary Topics
Publication date: 03 September 2017
DOI: 10.3997/2214-4609.201702132
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 2.62Mb )
Price: € 20

Summary:
It is important to consider the closure of cracks and pores in rock for radioactive waste disposal and carbon capture and storage to maintain or decrease the permeability of rock. In this study, we investigated the precipitation of calcium compounds on the rock surface in calcium hydroxide solution to consider whether sealing of pores and cracks is possible and accelerated or not. It was found that the precipitation of calcium compounds occurred on rock surfaces. Additionally, we found that the closure of cracks and pores in rock occurred from the P-wave velocity measurement and observation by the scanning electron microscope. Since the closure of cracks and pores can decrease the permeability in rock, it is concluded that the precipitation of calcium compounds on rock is useful for the geological disposal of radioactive wastes and carbon capture and storage.


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