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

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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.
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Issue Date
2013-05
Language
English
Article Type
Article
Keywords

C-S-H; COMB-SHAPED SUPERPLASTICIZERS; CEMENTITIOUS SYSTEMS; MODEL; ARCHITECTURE; ADMIXTURE; WATER

Citation

JOURNAL OF COLLOID AND INTERFACE SCIENCE, v.398, pp.67 - 73

ISSN
0021-9797
DOI
10.1016/j.jcis.2013.01.065
URI
http://hdl.handle.net/10203/174769
Appears in Collection
NE-Journal Papers(저널논문)
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