Preprint Article Version 1 This version is not peer-reviewed

A Study on the Sulfate Resistance of Alkali Activated FA Based Geopolymer and GGBFS Blended Mortar with Various Sulfate Types

Version 1 : Received: 5 November 2018 / Approved: 8 November 2018 / Online: 8 November 2018 (07:52:29 CET)

How to cite: Cho, Y.; Park, K.; Jung, S.; Chung, Y. A Study on the Sulfate Resistance of Alkali Activated FA Based Geopolymer and GGBFS Blended Mortar with Various Sulfate Types. Preprints 2018, 2018110190 (doi: 10.20944/preprints201811.0190.v1). Cho, Y.; Park, K.; Jung, S.; Chung, Y. A Study on the Sulfate Resistance of Alkali Activated FA Based Geopolymer and GGBFS Blended Mortar with Various Sulfate Types. Preprints 2018, 2018110190 (doi: 10.20944/preprints201811.0190.v1).

Abstract

In this study, the changes in mass, compressive strength and length were analyzed to investigate sulfate resistance according to ground granulated blast furnace slag (GGBFS) blending ratio and type of sulfate solution. All alkali activated mortars showed excellent sulfate resistance when immersed in sodium sulfate (Na2SO4) solution. However, when immersed in magnesium sulfate (MgSO4) solution, different sulfate resistance results were obtained depending on the presence of GGBFS. Alkali activated GGBFS blended mortars showed a tendency to increase mass, increase length and decrease compressive strength when immersed in magnesium sulfate solution, but the alkali activated FA mortars did not show any significant difference depending on the types of sulfate solution. The deterioration of alkali activated GGBFS blended mortars in the immersion of magnesium sulfate solution was confirmed by the decomposition of C-S-H which is the reaction product by magnesium ion and the formation of gypsum (CaSO4·2H2O) and brucite (Mg(OH)2).

Subject Areas

alkali activated materials; fly ash; ground granulated blast furnace slag; sulfate resistance; cation accompanying sulfate

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