Intrinsic differences in atomic ordering of calcium (alumino)silicate hydrates in conventional and alkali-activated cements

被引：68

作者：

White, Claire E. ^{[1
,2
,3
,4
]}

Daemen, Luke L. ^{[3
]}

Hartl, Monika ^{[3
]}

Page, Katharine ^{[3
]}

机构：

[1] Princeton Univ, Dept Civil & Environm Engn, Princeton, NJ 08544 USA

[2] Princeton Univ, Andlinger Ctr Energy & Environm, Princeton, NJ 08544 USA

[3] Los Alamos Natl Lab, Manuel Lujan Jr Neutron Scattering Ctr, Los Alamos, NM 87545 USA

[4] Los Alamos Natl Lab, Los Alamos, NM USA

来源：

CEMENT AND CONCRETE RESEARCH | 2015年 / 67卷

关键词：

X-ray diffraction (B); Calcium-silicate-hydrate (C-S-H) (B); Amorphous material (B); Alkali-activated cement; Portland cement (D); C-S-H; SODIUM ALUMINOSILICATE; CRYSTAL-STRUCTURE; SILICATE-HYDRATE; LOCAL-STRUCTURE; SLAG; METAKAOLIN; GEOPOLYMER; EVOLUTION; KINETICS;

D O I：

10.1016/j.cemconres.2014.08.006

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The atomic structures of calcium silicate hydrate (C-S-H) and calcium (-sodium) aluminosilicate hydrate (C-(N)-A-S-H) gels, and their presence in conventional and blended cement systems, have been the topic of significant debate over recent decades. Previous investigations have revealed that synthetic C-S-H gel is nanocrystalline and due to the chemical similarities between ordinary Portland cement (OPC)-based systems and low-CO2 alkali-activated slags, researchers have inferred that the atomic ordering in alkali-activated slag is the same as in OPC-slag cements. Here, X-ray total scattering is used to determine the local bonding environment and nanostructure of C(-A)-S-H gels present in hydrated tricalcium silicate (C3S), blended C3S-slag and alkali-activated slag, revealing the large intrinsic differences in the extent of nanoscale ordering between C-S-H derived from C3S and alkali-activated slag systems, which may have a significant influence on thermodynamic stability, and material properties at higher length scales, including long term durability of alkali-activated cements. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：66 / 73

页数：8

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