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Effect of Silica Fume on Metakaolin Geopolymers’ Sulfuric Acid Resistance

Vogt, Oliver ; Ukrainczyk, Neven ; Koenders, Eddie (2022)
Effect of Silica Fume on Metakaolin Geopolymers’ Sulfuric Acid Resistance.
In: Materials, 2022, 14 (18)
doi: 10.26083/tuprints-00021307
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Effect of Silica Fume on Metakaolin Geopolymers’ Sulfuric Acid Resistance
Language: English
Date: 2022
Place of Publication: Darmstadt
Year of primary publication: 2022
Publisher: MDPI
Journal or Publication Title: Materials
Volume of the journal: 14
Issue Number: 18
Collation: 26 Seiten
DOI: 10.26083/tuprints-00021307
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Origin: Secondary publication via sponsored Golden Open Access

To demonstrate the importance of the Si/Al ratio in terms of geopolymer mix designs for acid resistance, a metakaolin-based geopolymer was modified by replacing the aforementioned precursor with different percentages of silica fume. Durability tests were performed by exposing geopolymers with varying amounts of silica fume (up to 9%) to sulfuric acid solution (pH 1) over a period of 84 days. Geopolymer samples were analyzed by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX) before and after 7, 14, 28, 56 and 84 days of exposure. To show the time-dependent change of the elemental composition in the corroded layer after sulfuric acid attack, SEM-EDX elemental mappings were conducted and divided into 100 µm segments to generate element-specific depth profiles. The results show that above a critical silica fume content, the erosion of the sample surface by complete dissolution can be prevented and higher amounts of silica fume lead to a significant densification of large (protective) areas of the corroded layer, which delays the progress of corrosion.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-213079
Additional Information:

Keywords: geopolymer; metakaolin; silica fume; sulfuric acid attack; corrosion; durability; SEM-EDX

Classification DDC: 600 Technology, medicine, applied sciences > 600 Technology
Divisions: 13 Department of Civil and Environmental Engineering Sciences > Institute of Construction and Building Materials
Date Deposited: 13 May 2022 12:10
Last Modified: 23 Aug 2022 12:40
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/21307
PPN: 494720115
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