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The reaction of fly ash in concrete a critical examination

✍ Scribed by A.L.A. Fraay; J.M. Bijen; Y.M. de Haan

Publisher: Elsevier Science
Year: 1989
Tongue: English
Weight: 930 KB
Volume: 19
Category: Article
ISSN: 0008-8846
DOI: 10.1016/0008-8846(89)90088-4

No coin nor oath required. For personal study only.

✦ Synopsis

It is a well known fact that the reaction of fly ash in concrete, only starts significantly after one or more weeks. Until this period the fly ash behaves more or less as an inert material, which only serves as a precipitation nucleus for Ca(OH) 2 and C-S-H gel originating from the cement hydration. After the initiation of the pozzolanie reaction of the fly ash, the cement paste will beeome increasingly denser. This paper gives a critical examination of the "why" of this "incubation period", it presents a model for the formation of pozzolanie reaction products and discusses the development of the pore structure.

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