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[58250] Artykuł: Determining k-Value with Regard to Freeze-Thaw Resistance of Concretes Containing GGBSCzasopismo: Materials Tom: 11(12), Zeszyt: 12, Strony: 1-10ISSN: 1996-1944 Wydawca: MDPI, ST ALBAN-ANLAGE 66, CH-4052 BASEL, SWITZERLAND Opublikowano: 2018 Autorzy / Redaktorzy / Twórcy Grupa MNiSW: Publikacja w czasopismach wymienionych w wykazie ministra MNiSzW (część A) Punkty MNiSW: 35 Klasyfikacja Web of Science: Article DOI Web of Science Keywords: GGBS  k-value  freeze-thaw resistance  non-air-entrained concrete   |
The European concrete standard EN 206 introduces the k-value concept as one of the three methods allowing the use of granulated blast furnace slag in the design of the freeze-thaw-resistant concrete mix. It is assumed that the freeze-thaw durability of the concrete, whose composition (w/c ratio) has been corrected by adopting a certain k-value, is the same as the freeze-thaw resistance of the reference concrete made with the cement containing no addition (CEM I). This article presents the results of freeze-thaw resistance analysis (modified with the ASTMC666A standard Class XF3) of 24 series of concretes made with a binder containing varied amounts of slag, with a w/b ratio ranging from 0.25 to 0.55. The aim of the study was to estimate the k-value as a parameter defined by the w/b ratio and the slag content in the binder. In this approach, the k-value is determined by trial and error in such a way that the deformation of the concrete specimens containing the slag corresponds to the deformation of the reference concrete. As shown by the analysis, the k-value decreases with increasing slag content in the binder.