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dc.contributor.authorJacobsen, Stefan
dc.contributor.authorOllendorff, Margrethe
dc.contributor.authorGeiker, Mette Rica
dc.contributor.authorTunstall, Lori
dc.contributor.authorScherer, George W.
dc.date.accessioned2013-01-08T20:25:40Z
dc.date.accessioned2016-07-06T11:33:55Z
dc.date.available2013-01-08T20:25:40Z
dc.date.available2016-07-06T11:33:55Z
dc.date.issued2012
dc.identifier.citationPedersen, Bård; Larsen, Claus Kenneth; Bager, Dirch H. [Eds.] Durability Aspects of Fly Ash and Slag in ConcreteWorkshop Proceedings from a Nordic Miniseminar Oslo - Norway, 15.-16. february 2012 p. 103-120nb_NO
dc.identifier.urihttp://hdl.handle.net/11250/2395838
dc.description.abstractAbstract: The unpredictable air entrainment in fly ash concrete caused by carbon in fly ash was studied by measuring adsorption of Air Entraining Agents (AEA) on the fly ash and by Foam Index (FI) testing. The FI test measures the mass ratio of AEA/binder required to obtain stable foam when shaking a mixture of water, binder powder and AEA, while increasing AEA-dosage stepwise. A review of concrete air entrainment and new studies combining adsorption (TGA, NMR) of AEA on fly ash with various FI test procedures, including time dependent effects on foam stability, are presented. Inter-laboratory correlation between FI and concrete air void content verifies that FI is reliable for assessing compatible binder-admixture combinations. Our adsorption- and FI measurements showed that AEA with detectable adsorption required more AEA to foam than AEA that did not adsorb on the fly ash. Foam stability was more time dependent for adsorbing AEA. NMR showed signs of chemical changes of the AEA-FA mix after adsorption. Key words: AEA, fly ash, carbon, air entrainment, adsorption, foam indexnb_NO
dc.language.isoengnb_NO
dc.publisherNordic Concrete Federation Oslonb_NO
dc.titlePredicting AEA dosage by Foam Index and adsorption on Fly Ashnb_NO
dc.typeChapternb_NO
dc.typeConference objectnb_NO
dc.typePreprintnb_NO
dc.date.updated2013-01-08T20:25:41Z
dc.identifier.cristin984072
dc.description.localcodePresentations from a Nordic workshop: http://www.vegvesen.no/Fag/Publikasjoner/Publikasjoner as Report No. 149nb_NO


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