Microstructural changes of globules in calcium-silicate-hydrate gels with and without additives determined by small-angle neutron and X-ray scattering

被引：56

作者：

Chiang, Wei-Shan ^{[1
]}

Fratini, Emiliano ^{[2
,3
]}

Ridi, Francesca ^{[2
,3
]}

Lim, Sung-Hwan ^{[4
]}

Yeh, Yi-Qi ^{[5
]}

Baglioni, Piero ^{[2
,3
]}

Choi, Sung-Min ^{[4
]}

Jeng, U-Ser ^{[5
]}

Chen, Sow-Hsin ^{[1
]}

机构：

[1] MIT, Dept Nucl Sci & Engn, Cambridge, MA 02139 USA

[2] Univ Florence, Dept Chem Ugo Schiff, I-50019 Florence, Italy

[3] Univ Florence, CSGI, I-50019 Florence, Italy

[4] Korea Adv Inst Sci & Technol, Dept Nucl & Quantum Engn, Taejon 305701, South Korea

[5] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2013年 / 398卷

关键词：

Calcium-silicate-hydrate; Portland cement; Polycarboxylic ether; Small-angle scattering; Colloid; Fractal structure; C-S-H; COMB-SHAPED SUPERPLASTICIZERS; CEMENT; MODEL; ARCHITECTURE; WATER;

D O I：

10.1016/j.jcis.2013.01.065

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The microstructure of calcium-silicate-hydrate (C-S-H) gel, a major hydrated phase of Ordinary Portland Cement, with and without polycarboxylic ether (PCE) additives is investigated by combined analyses of small-angle X-ray scattering (SAXS) and small-angle neutron scattering (SANS) data. The results show that these comb-shaped polymers tend to increase the size of the disk-like globules but have little influence on the thickness of the water and calcium silicate layers within the globules. As a result, the fractal packing of the globules becomes more open in the range of a few hundred nanometers, in the sense that the mass fractal dimension diminishes, since the PCE adsorption on the globules increases the repulsive force between and polydispersity of the C-S-H units. Moreover, scanning electron microscope (SEM) study of the synthesized C-S-H gels in the micrometer range shows that the PCEs depress the formation of fibrils while enhancing the foil-like morphology. (C) 2013 Elsevier Inc. All rights reserved.

引用

页码：67 / 73

页数：7

共 21 条

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