Sulfuric acid resistance of one-part alkali-activated mortars

One-part alkali-activated (geopolymer) mortars based on three different silica-rich starting materials and sodium aluminate, with and without ground granulated blast furnace slag (GGBFS) addition, were tested regarding sulfuric acid resistance according to DIN 19573:2016-03 (70 days at pH = 1). Corr...

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Bibliographic Details
Published in:Cement and concrete research 2018-07, Vol.109, p.54-63
Main Authors: Sturm, P., Gluth, G.J.G., Jäger, C., Brouwers, H.J.H., Kühne, H.-C.
Format: Article
Language:English
Subjects:
Acid resistance
Alkali activated cement (D)
Alkalies
ALUMINATES
Blast furnace chemistry
Blast furnace slags
BLAST FURNACES
Blast resistance
Calcium sulfate
CALCIUM SULFATES
CEMENTS
Characterization (B)
CHEMICAL ANALYSIS
Chemical attack
Durability (C)
Granulation
High resistance
HYDROGEN 1
Materials durability
MATERIALS SCIENCE
MORTARS
Mortars (material)
NMR spectroscopy
NUCLEAR MAGNETIC RESONANCE
One-part geopolymers
Organic chemistry
Pastes
PH VALUE
Polymers
PRECIPITATION
SCANNING ELECTRON MICROSCOPY
Scientific imaging
SILICA GEL
SILICON 29
Silicon dioxide
SLAGS
Sodium aluminate
SODIUM COMPOUNDS
Spectroscopy (B)
Sulfate resistance
SULFURIC ACID
WATER
Water storage
X-RAY DIFFRACTION
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Description
Summary:One-part alkali-activated (geopolymer) mortars based on three different silica-rich starting materials and sodium aluminate, with and without ground granulated blast furnace slag (GGBFS) addition, were tested regarding sulfuric acid resistance according to DIN 19573:2016-03 (70 days at pH = 1). Corresponding pastes were characterized by XRD, SEM, chemical analysis, 29Si MAS NMR and 1H-29Si CPMAS NMR after water storage and after acid exposure. The mortars exhibited a high resistance against sulfuric acid attack, with the best ones conforming to the requirements of DIN 19573:2016-03. The analytical results showed that this was due to precipitation of silica gel at the acid-mortar interface, which formed a mechanically stable layer that protected the subjacent mortar and thus inhibited further degradation. The addition of GGBFS decreased the acid resistance via formation of expansive calcium sulfate phases.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2018.04.009