The Influence of nitrate on dissolution behavior of cement hydrates

Fujita, Hideki*; Negishi, Kumi*; Osawa, Tsutomu*; Honda, Akira

The influence of sodium nitrate on dissolution of cement hydrates was investigated by flow through experiment. Dissolution of portlandite was accelerated in NaNO $_{3}$ solution of 1 mol dm $^{-3}$ than in ion exchanged water. The acceleration of portlandite dissolution attributed to impact of ionic strength on the activities of aqueous species, because Ca concentration in 1 mol kg $^{-1}$ NaNO $_{3}$ solution equilibrated with portlandite was estimated to be 1.5 times as high as that in pure water. After flow through experiment, compressive strength fell down and porosity was higher than blank test using pure water. However low permeabilities were contradictory kept during NaNO $_{3}$ solution flowing. Dense existence of Na was possible to cause the low permeability during NaNO $_{3}$ solution flowing.

Language	:	Japanese
Journal	:	Semento, Konkurito Rombunshu
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Number	:	61
Pages	:	p.262 - 269
Publication Year/Month	:	2008/02
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Research Facility	:	ENTRY(地層処分基盤研究施設)
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Registration No. : AA20070282
JAEA Abstracts No. : 36000760
Paper Submission No. : 4042

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