TY - JOUR
T1 - Sulfuric acid resistance of one-part alkali-activated mortars
AU - Sturm, P.
AU - Gluth, G.J.G.
AU - Jäger, C.
AU - Brouwers, H.J.H.
AU - Kühne, H.C.
PY - 2018/7/1
Y1 - 2018/7/1
N2 - 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.
AB - 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.
KW - Alkali activated cement (D)
KW - Characterization (B)
KW - Durability (C)
KW - One-part geopolymers
KW - Spectroscopy (B)
UR - http://www.scopus.com/inward/record.url?scp=85045555251&partnerID=8YFLogxK
U2 - 10.1016/j.cemconres.2018.04.009
DO - 10.1016/j.cemconres.2018.04.009
M3 - Article
AN - SCOPUS:85045555251
VL - 109
SP - 54
EP - 63
JO - Cement and Concrete Research
JF - Cement and Concrete Research
SN - 0008-8846
ER -