The basic building block of calcium-silicate-hydrate (C-S-H) gel, which is the major hydration product of a commercial Portland cement paste, is usually referred as "globule" in the Jennings' colloidal model-II developed for C-S-H. The detailed nanostructure of the globule is so far not given quantitatively. In this paper, we determine the structural parameters of the building block with good accuracy by small-angle neutron scattering technique probing an extended interval of the scattering vector, Q from 0.015-1.0 angstrom(-1). In this Q-range an interlamellar peak at 0.65-0.80 angstrom(-1) is present, shifting as a function of the water content present in the C-S-H gel. This additional feature enables us to confirm the presence of a lamellar structure and determine the thicknesses of both the water and the hydrated calcium silicate layers respectively proper of the C-S-H globules.
Microstructure Determination of Calcium-Silicate-Hydrate Globules by Small-Angle Neutron Scattering / W. S. Chiang;E. Fratini;P. Baglioni;D. Z. Liu;S. H. Chen. - In: JOURNAL OF PHYSICAL CHEMISTRY. C. - ISSN 1932-7447. - STAMPA. - 116:(2012), pp. 5055-5061. [10.1021/jp300745g]
Microstructure Determination of Calcium-Silicate-Hydrate Globules by Small-Angle Neutron Scattering
FRATINI, EMILIANO;BAGLIONI, PIERO;
2012
Abstract
The basic building block of calcium-silicate-hydrate (C-S-H) gel, which is the major hydration product of a commercial Portland cement paste, is usually referred as "globule" in the Jennings' colloidal model-II developed for C-S-H. The detailed nanostructure of the globule is so far not given quantitatively. In this paper, we determine the structural parameters of the building block with good accuracy by small-angle neutron scattering technique probing an extended interval of the scattering vector, Q from 0.015-1.0 angstrom(-1). In this Q-range an interlamellar peak at 0.65-0.80 angstrom(-1) is present, shifting as a function of the water content present in the C-S-H gel. This additional feature enables us to confirm the presence of a lamellar structure and determine the thicknesses of both the water and the hydrated calcium silicate layers respectively proper of the C-S-H globules.I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.