Development of low pH cement systems forming magnesium silicate hydrate (M-S-H)

被引：287

作者：

Zhang, Tingting ^{[1
,2
]}

Cheeseman, C. R. ^{[1
]}

Vandeperre, L. J. ^{[2
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Civil & Environm Engn, London SW7 2AZ, England

[2] Univ London Imperial Coll Sci Technol & Med, Ctr Adv Struct Ceram, Dept Mat, London SW7 2AZ, England

来源：

CEMENT AND CONCRETE RESEARCH | 2011年 / 41卷 / 04期

基金：

英国工程与自然科学研究理事会;

关键词：

Waste management (E); MgO (D); Silica fume (D); pH (A); Hydration (A); WASTE; STABILIZATION; CHEMISTRY; BLENDS; GELS;

D O I：

10.1016/j.cemconres.2011.01.016

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This work aimed to develop novel cement systems for waste encapsulation that would form with a pH of around 10. The approach taken was to investigate the formation of brucite by hydration of a light burned periclase (MgO). Commercially available MgO powders often contain some CaO, and therefore silica fume was added to form C-S-H gel. Identification of the hydrated phases in MgO/silica fume samples showed that brucite formed in substantial quantities as expected. However, brucite reacted with the silica fume to produce a magnesium silicate hydrate (M-S-H) gel phase. After 28 days, the pH of systems rich in MgO tended towards the pH controlled by residual brucite (similar to 10.5), whereas when all brucite reacts with silica fume a cement with an equilibrium pH just below 10 was achieved. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：439 / 442

页数：4

共 21 条

[1]

ALLISON J.D., 1991, MINTEQA2 PRODEFA2 GE

[2] Solution chemistry during cement hydration in the presence of metal hydroxide wastes [J].

Asavapisit, S ;

Fowler, G ;

Cheeseman, CR .

CEMENT AND CONCRETE RESEARCH, 1997, 27 (08) :1249-1260

[3] Overview of waste stabilization with cement [J].

Batchelor, B. .

WASTE MANAGEMENT, 2006, 26 (07) :689-698

[4] The magnesia-silica gel phase in slag cements: alkali (K, Cs) sorption potential of synthetic gels [J].

Brew, DMR ;

Glasser, FP .

CEMENT AND CONCRETE RESEARCH, 2005, 35 (01) :77-83

[5] Synthesis and characterisation of magnesium silicate hydrate gels [J].

Brew, DRM ;

Glasser, FP .

CEMENT AND CONCRETE RESEARCH, 2005, 35 (01) :85-98

[6] Characterisation of environmentally exposed cement-based stabilised/solidified industrial waste [J].

Fitch, JR ;

Cheeseman, CR .

JOURNAL OF HAZARDOUS MATERIALS, 2003, 101 (03) :239-255

[7]

Gustafsson J.P., 2009, VISUAL MINTEQ

[8] RADIOACTIVE WASTE-PORTLAND CEMENT SYSTEMS .1. RADIONUCLIDE DISTRIBUTION [J].

JANTZEN, CM ;

GLASSER, FP ;

LACHOWSKI, EE .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1984, 67 (10) :668-673

[9] RADIOACTIVE WASTE-PORTLAND CEMENT SYSTEMS .2. LEACHING CHARACTERISTICS [J].

JANTZEN, CM .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1984, 67 (10) :674-678

[10] Reactions in cement encapsulated nuclear wastes: need for toolbox of different cement types [J].

Milestone, NB .

ADVANCES IN APPLIED CERAMICS, 2006, 105 (01) :13-20

← 1 2 3 →