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

页码：54 / 63

页数：10

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