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[1281] Artykuł:

Microstructure of alkali-silica reaction products in conventional standard and accelerated testing

Czasopismo: Ceramics-Silikaty   Tom: 47, Zeszyt: 3, Strony: 108-115
ISSN:  0862-5468
Wydawca:  INST CHEMICAL TECHNOLOGY, DEPT GLASS CERAMICS, TECHNICKA 5, PRAGUE 166 28, CZECH REPUBLIC
Opublikowano: 2003
 
  Autorzy / Redaktorzy / Twórcy
Imię i nazwisko Wydział Katedra Procent
udziału
Liczba
punktów
Zdzisława Owsiak orcid logoWBiAKatedra Technologii i Organizacji Budownictwa *****1006.00  

Grupa MNiSW:  Publikacja w czasopismach wymienionych w wykazie ministra MNiSzW (część A)
Punkty MNiSW: 6
Klasyfikacja Web of Science: Article


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Keywords:

alkali-silica reactions  mortar bar tests  SEM 



Abstract:

Mortar bars with granite or chalcedonite aggregate have been tested under conventional standard testing, based on storage of specimens at at 38 +/- 2degreesC, RH greater than or equal to 95%. Aggregate of granite or chalcedonite and silica sand containing opal were used in mortar bars for expansion measurement under accelerated testing, based on storage of specimens in 1 N NaOH solution at 80degreesC. Scanning electron microscopy (SEM) equipped with an energy-dispersive X-ray analysis (EDX) showed that specimens that expanded in the conventional standard mortar bar test (after 30 months) contained alkali-silicate products and secondary ettringite. Specimens that expanded in the accelerated test (after 16 days) showed the same morphological and compositional alkali-silica gel only. The reaction products in the both methods appear to be the same, indicating that reaction mechanisms are the same but differ only in rates. The results of the conducted test show that the alkali content (especially potassium) in cement plays an important role in the process of expansion in the accelerated method.