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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Effects of Fly Ash on Carbonation of Concrete With Portland Blast-Furnace Slag Cement
Author(s): J. Bijen and R. Van SelstI
Publication: Special Publication
Appears on pages(s): 1001-1030
Keywords: blast furnace slag; carbonation; concretes; durability; fly ash; Materials Research
Abstract:An investigation has been carried out on the effects of cement replacement by fly ash on the carbonation rate of concrete. The research was mainly devoted to portland blast furnace slag cement because this cement has a major market share in the Netherlands. It has been concluded that in the case of portland blast furnace slag cement concrete, replacement up to 25 percent by mass results in a substantially higher carbonation rate, while for a similar portland-cement concrete, the difference between concrete with and without replacement is relatively small. This observation corresponds with the finding that the pH development of the pore water in concrete with portland blast furnace slag cement is too low to initiate a substantial fly ash dissolution. As a consequence, pozzolanic activity will be slight. However, in portland-cement concrete, pozzolanic action can develop more effectively and contribute to strength and densification of the matrix. A useful relation exists between the carbonation depth after 1 or 2 years and compressive strength after 28 days and, even better, after 7 days for each type of cement. This relation might cover all types of cements when the lime content of the binder is involved.
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