Physical changes in setting gypsum plaster

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Journal titleASTM Bulletin
Pages5562; # of pages: 8
Subjectgypsum plaster; water absorption; physical changes; hardening; absorption d'eau; alteration physique; durcissement (phenomene)
AbstractThe object of the reported work was the study of physical changes in a setting plaster mass including exchanges and equilibria between the solid and liquid phases. Studied were: (a) variations in the suction of the mass to free water; (b) water sorption; (c) variations in apparent volume. Water sorption studies showed the initial presence of water in excess of saturation requirements and that water sorbed closely approximated the amount required to fill emptied pores. As a result of these considerations it is suggested that plaster hardening involves only mechanical interaction of growing gypsum crystals. How the consolidation mechanism results in apparent volume changes and suction development is shown. Development of a logical concept of the sequence of physical changes in the setting mass is attempted.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number5134
NPARC number20375452
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Record identifierf3c689bf-8b29-4b68-a7cc-8f59265ce0fd
Record created2012-07-23
Record modified2016-05-09
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