Air entrainment in the presence of superplasticizers

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AuthorSearch for:
Journal titleJournal of the American Concrete Institute
Pages326331; # of pages: 6
Subjectair entraining cement; mortar; plasticizers; porosity; frost resistance; air-entraining agents; freeze-thaw durability; mortars; plasticizers; porosity; voids; water-reducing agents; Admixtures
AbstractAir-entrained and plain mortar specimens (cement-sand ratio = 1:3, water-cement ratio = 0.65) were prepared using a modified sulfonated polymer, a naphthalene-formaldehyde condensate, or a sulfonated melamine formaldehyde admixture at two levels of concentration. The air-void system determined by the linear traverse method, the pore size distribution obtained by mercury intrusion porosimetry, and frost resistance assessed by alternate freezing and thawing were compared with those of control mixes containing no superplasticizer. A large pore volume (approximately equal to 0.3 to 2 mu m) in the presence of an air-entraining admixture is assumed to be responsible for the improved frost resistance of cement paste. Superplasticizers eliminate large air voids visible under the microscope but do not significantly interfere with the action of air- entraining admixtures in the formation of small pores.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number22702
NPARC number20374911
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Record identifierfee92c28-c060-4c17-a748-7e84c0472f67
Record created2012-07-23
Record modified2016-05-09
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