Titanium in GGBS-like calcium-magnesium-aluminosilicate glasses: Its role in the glass network, dissolution at alkaline pH and surface layer formation

被引：3

作者：

Blotevogel, Simon ^{[1
]}

Poirier, Mathilde ^{[2
]}

Vantelon, Delphine ^{[3
]}

Chesneau, Erwan ^{[4
]}

Dutoit, Charles E. ^{[5
]}

Montouillout, Valerie ^{[4
]}

Fayon, Franck ^{[4
]}

Kaknics, Judit ^{[6
]}

Landrot, Gautier ^{[3
]}

Saldi, Giuseppe D. ^{[7
]}

Schott, Jacques ^{[7
]}

Vezin, Herve ^{[5
]}

Patapy, Cedric ^{[1
]}

Cyr, Martin ^{[1
]}

机构：

[1] Univ Toulouse, Lab Materiaux & Durabil Construct LMDC, INSA UPS Genie Civil, 135 Ave Rangueil, F-31077 Toulouse, France

[2] Ecocem Mat, Block F1,Eastpoint Business Pk 3, Dublin, Ireland

[3] Synchrotron SOLEIL, Lorme Merisiers, St Aubin BP48, F-91192 Gif Sur Yvette, France

[4] CNRS, Condit Extremes & Materiaux Haute Temp & Irradiat, UPR3079, 1D Ave Rech Sci, F-45071 Orleans, France

[5] Univ Lille, Lab Spect Interact Reactiviteet & Environm LASIRE, CNRS, Lille, France

[6] ArcelorMittal Maizieres Res, Voie Romaine, F-57283 Maizieres Ies Met, France

[7] Univ Toulouse, Geosci Environm Toulouse GET, Observ Midi Pyrenees, CNRS,IRD, 14 Ave E Belin, F-31400 Toulouse, France

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 2022年 / 591卷

关键词：

CMAS; Supplementary cementitious materials (SCM); Gel layer; XAS; Cement; Coordination; Corrosion; Non-bridging oxygen; Ground-granulate blast-furnace slag (GBFS); X-RAY-ABSORPTION; K-EDGE XANES; MQ-MAS NMR; SILICATE-GLASSES; BOROSILICATE GLASSES; NEUTRON-DIFFRACTION; CHEMICAL DURABILITY; TI-COORDINATION; SITE GEOMETRY; ION-EXCHANGE;

D O I：

10.1016/j.jnoncrysol.2022.121708

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Small TiO2 contents in the slag-glass significantly reduce their cementitious reactivity. We investigated the role of Ti in the glass network and its influence on slag-glass dissolution. XANES and EPR analysis showed that 67% of Ti was present as Ti(IV) with about 70% in Ti-[5] and 30% in Ti-[4] coordination, and 33% as Ti(III). The presence of Ti had only a minor impact on initial dissolution rates at pH 11 (R asymptotic to 10(-6) molglass.s(-1).m(-2)). During dissolution, Ti accumulated in an amorphous layer at the glass-surface. Ti-coordination in this layer was 50% Ti-[5] and 50% Ti-[6]. At pH 11, the layer was mainly composed of TiO2 (66 wt%), but intermixed with a hydrotalcite-like phase at pH 13. The loss of cementitious reactivity in the presence of Ti appears to be not only due to stabilization of the glass structure but also to the formation of a Ti-rich surface-layer, that may become passivating.

引用

页数：14

共 76 条

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