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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Air Entrainment in the Presence of Superplasticizers
Author(s): G.G. Litvan
Publication: Journal Proceedings
Appears on pages(s): 326-331
Keywords: air-entraining agents; air entrainment; freeze-thaw durability;mortars (material); plasticizers; porosity;voids;water-reducing agents.
Abstract:Air-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 (N 0.3 to 2 pm) 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.
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