(Received 29 November 2007; accepted 18 May 2008)
Published Online: 2008
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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.
Harris, Nathan J.
Engineer, Exponent Failure Analysis Associates, Menlo Park, CA
Hover, Kenneth C.
Professor, Cornell University, Ithaca, NY
Folliard, Kevin J.
Associate Professor, University of Texas, Austin, TX
Ley, M. Tyler
Assistant Professor, Civil and Environmental Engineering, Oklahoma State University, Stillwater, OK
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