Sulfuric acid resistance of one-part alkali-activated mortars

被引：103
|
作者：
Sturm, P. [1 ]
Gluth, G. J. G. [1 ]
Jager, C. [2 ]
Brouwers, H. J. H. [3 ]
Kuhne, H. -C. [1 ]
机构：
[1] Bundesanstalt Mat Forsch & Prufung BAM, Div Technol Construct Mat 7 4, Unter Eichen 87, D-12205 Berlin, Germany
[2] Bundesanstalt Mat Forsch & Prufung BAM, Div Struct Anal 1 3, Richard Willstatter Str 11, D-12489 Berlin, Germany
[3] Eindhoven Univ Technol, Dept Built Environm, POB 513,Vertigo 6-10, NL-5600 MB Eindhoven, Netherlands
来源：
CEMENT AND CONCRETE RESEARCH | 2018年 / 109卷
关键词：
Alkali activated cement (D); Durability (C); Characterization (B); Spectroscopy (B); One-part geopolymers; NUCLEAR-MAGNETIC-RESONANCE; BLAST-FURNACE SLAG; RICE HUSK ASH; FLY-ASH; ALUMINOSILICATE-HYDRATE; CONCRETE CORROSION; SEWER NETWORKS; ORGANIC-ACID; SILICA-GEL; SI-29; NMR;
D O I：
10.1016/j.cemconres.2018.04.009
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
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, Si-29 MAS NMR and H-1-Si-29 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.
引用
收藏
页码：54 / 63
页数：10
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