Volume instability of porous solids: Part I/ Instabilite en volume de solides poreux

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ConferenceInternational Congress on the Chemistry of Cement. 7th./ 7ieme Congress International Chimie du ciment: 1980, Paris, France
Subjectporosity; adsorption; silica glass; hydrated cement; deterioration; adsorption; verre de silice; ciment hydrate; deterioration
AbstractA 27 X 10[-5] fractional length change occurred in a water- saturated porous silica glass on adsorption of NaNO[3] from aqueous solution. The specimen suffered a 50 X 10[-5] Deltal/l irreversible length change after determination of the extension adsorption isotherm. The isotherm greatly resembles that obtained on water vapour adsorption by dry glass, and exhibits marked hysteresis in all concentration regions. An expansion of 325 X 10[-5] Deltal/l was found while porous glass was under attack from 0.2 N NaOH; and 125 X 10[-5] Deltal/l length change occurred during the dissolution in 1.0 N HCl of a 0.5 W/C hydrated cement specimen. On leaching lime from 0.6 W/C cement paste with ethylene glycol, 120 X 10[-5] Deltal/l was observed. These results introduce an additional factor that may explain the deterioration process of porous solids exposed to some chemicals, for example, in alkali aggregate reaction, sulfate attack and seawater attack.
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AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number19449
NPARC number20331334
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Record identifiera65fb0c3-60e7-4f1c-a06c-5b1847da0cef
Record created2012-07-18
Record modified2016-05-09
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