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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: Degree of Fly Ash Reaction in Internally Alkali-Activated Cement Paste
Author(s): Phuong Trinh Bui, Yuko Ogawa, Kenichiro Nakarai and Kenji Kawai
Publication: Special Publication
Appears on pages(s): 31.1-31.14
Keywords: cement paste, fly ash, internal activation, mercury intrusion porosimetry, NaOH solution, porosity, pozzolanic reaction, selective dissolution method
Abstract:The present study aimed at investigating the degree of fly ash reaction and porosity up to 12 months of aging for cement paste specimens internally activated by natural injection of NaOH solution and those internally cured by injection of deionized water 1 month after casting, to assess the positive effect of internal alkali activation. In addition, reference specimens were fabricated with no solution injection. Two replacements of cement by fly ash were 0% (Fa0) and 40% (Fa40) by mass. Degree of fly ash reaction in Fa40 internally
activated by NaOH solution was higher than that in Fa40 internally cured by water or no solution. Injection of
solution decreased the volume proportion of pores ranging 0.02–0.33 μm (7.87 × 10-7–1.29 × 10-6 in.) to total pores and increased that of pores ranging 0.003–0.02 μm (1.18 × 10-7–7.87 × 10-7 in.) in Fa40, more than that of wno solution up to 12 months. Meanwhile, those volume proportions in Fa0 were only affected significantly by injection of solution at 12 months. Consequently, it can be concluded that pozzolanic reaction of fly ash was accelerated in cement paste internally activated by NaOH solution.
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