The flow of helium into the microspaces of magnesium oxysulfate cement paste

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DOIResolve DOI: http://doi.org/10.1016/0008-8846(77)90120-X
AuthorSearch for: ; Search for:
TypeArticle
Journal titleCement and Concrete Research
ISSN0008-8846
Volume7
IssueSeptember 5
Pages58596; # of pages: 490
Subjecthelium; cement; collapse; chemical decomposition; drying; Concrete; helium; ciment; ecroulement; decomposition chimique; sechage
AbstractHelium flow measurements were made on samples of magnesium oxysulfate cement paste initially conditioned at 11% R.H. and dried in stages by combinations of pumping and heating. Physical changes in the microstructure of the cement paste due to chemical decomposition and water removal were monitored. It was concluded that helium can penetrate the microspaces of magnesium oxysulfate cement paste which form during removal of structural water. It appears that helium also enters discrete pores (unfilled with water) that become accessible when the cement paste is heated to 200 degrees C. Mercury (at 407 MPa) can intrude into those microspaces not initially accessible to helium. Collapse of structure occurs when water is removed from this system. An estimate of the density of the water removed up to 15% weight change was 1.21 + or - 0.07 g/cc.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierDBR-P-729
NRC number16187
3312
NPARC number20375655
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Record identifier29965045-fc37-41ad-9bbd-5ddbc0f3b36d
Record created2012-07-23
Record modified2016-05-09
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