NDLI: Investigations on the influence of fly ash on the formation and stability of artificially entrained air voids in concrete

Content Provider	Springer Nature Link
Author	Spörel, F. Uebachs, S. Brameshuber, W.
Copyright Year	2008
Abstract	In concrete, fly ash is applied to a task-oriented improvement of different properties. Besides the advantages, e.g. the improvement of the rheology of the fresh concrete or the density of the hardened concrete, some investigations and the experience from practice indicate that some fly ashes probably influence the formation and stability of artificially entrained air voids. The reason lies presumably in the fraction of unburned carbon, a minor component of the fly ash. To identify the causes, seven fly ashes from European power plants were investigated. The fly ashes were characterized and mortar and concrete tests were conducted to identify specific fly ash parameters which might be responsible for the impaired formation and stability of the air voids. Furthermore, it was examined whether the foam index test is applicable for the assessment of the air entraining agent demand and whether an adequate accuracy of the results is given. On the basis of the results it was also examined whether the mortar tests or a fly ash specific parameter can be applied as an alternative prediction tool to assess the air entraining agent demand for an air entrained concrete.Des cendres volantes sont parfois ajoutées aux bétons afin d´améliorer certaines propriétés comme l´ouvrabilité du béton frais ou l´imperméabilité du béton durci. Par ailleurs quelques travaux scientifiques et expériences pratiques montrent que quelques unes des cendres volantes altèrent probablement la formation et la stabilité des pores d´air artificiellement entraînées dans le béton. Le phénomène est probablement lié à la présence du carbone non brûlé, subsistant à taux faible dans les cendres volantes. Pour verifier cette hypothèse, sept cendres volantes des centrales thermiques européennes ont été étudiées. Les cendres choisies ont été caractérisées et des essais sur mortier ainsi que sur béton ont été faits afin d´identifier les paramètres éventuellement responsables de l´altération de la formation et stabilité des pores d´air entraînées dans le béton frais. En outre l´expérience foam index test a été appliquée pour évaluer la teneur d´entraîneur d´air nécessaire et pour vérifier la fiabilité des résultats. A partir des résultats obtenus, on a examiné si les essais sur mortiers d´un côté et les proprietés spècifiques des cendres volantes de l´autre côté peuvent servir comme critères alternatives de précision pour évaluer le dosage d´adjuvant entraîneur d´air dont un béton à air a besoin.
Starting Page	227
Ending Page	240
Page Count	14
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	42
Issue Number	2
e-ISSN	18716873
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-06-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fly ash Specific surface Air entraining agents Mortar Air entrained concrete Building Materials Civil Engineering Operating Procedures, Materials Treatment Mechanical Engineering Theoretical and Applied Mechanics Structural Mechanics
Content Type	Text
Resource Type	Article
Subject	Building and Construction Mechanics of Materials Materials Science Civil and Structural Engineering

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