ISSN: 1546-962X
Published Online: 17 July 2008
Page Count: 15

The Use of the Foam Index Test to Predict Air-Entraining Admixture Dosage in Concrete Containing Fly Ash: Part II—Development of a Standard Test Method: Apparatus and Procedure
Harris, Nathan J.
Engineer, Exponent Failure Analysis Associates, CA

Hover, Kenneth C.
Professor, Cornell University, NY

Folliard, Kevin J.
Associate Professor, University of Texas, TX

Ley, M. Tyler
Assistant Professor, Civil and Environmental Engineering, Oklahoma State University, OK

(Received 29 November 2007; accepted 18 May 2008)

Abstract

The foam index test can be useful for predicting air-entraining admixture (AEA) dosage in concrete or for evaluating AEA interaction with other mixture ingredients. The test is sensitive to several factors including container type and fullness, volume of materials, agitation, pipette precision, and others. This study isolates several key factors such as container dimensions and fullness, mixing procedure, time permitted for AEA-cm-water interaction, and time permitted for drainage of unstable foam; and examines their influence on foam index test results. Recommendations for a standard test are proposed.

Keywords:
air-entrained concrete, air-entraining admixtures, fly ash, foam index, quality control

Paper ID: JAI101602
DOI: 10.1520/JAI101602
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