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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 Void System and Frost Resistance of Concrete Containing Superplasticizers
Author(s): L. R. Roberts and P. Scheiner
Publication: Special Publication
Appears on pages(s): 189-214
Keywords: admixtures; air-entrained concretes; air entrainment;
bubbles; compressive strength; concrete durability; freeze-thaw
durability; mix proportioning; naphthalene compounds; plasticizers;
Abstract:Previous workers have shown that the air-void system in air-entrained concrete containing a superplasticizer tends toward larger bubbles. This effect leads to spacing factors larger than the 0.2 mm normally accepted as a requirement for durability. Nevertheless, concretes containing such admixtures generally have been found to be frost-resistant. The present work is an attempt to understand the reasons for durability when the accepted 0.2 mm spacing factor requirement is not met. The distribution of air-void sizes in air-en-trained concretes made with and without a naphthalene sulfonate type superplasticizer were examined, using a new microprocessor-based Rosiwal linear traverse apparatus. The individual chord intercepts available with this system were fitted to a zeroth-order logarithmic distribution function, and the parameters of the fitted function were related to frost resistance as tested for by ASTM: C 666, procedure A. Concretes containing the superplasticizer were frost-resistant, despite spacing factors in excess of 0.2 mm. The most frequently encountered chord lengths in superplasticizer-con-taining concrete did not change relative to equal slump refer-ence concrete.
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