New insights into water bonding during early tricalcium silicate hydration with quasielastic neutron scattering

作者：Gutberlet T^*; Hilbig H; Beddoe R E; Lohstroh W

来源：Cement and Concrete Research, 2013, 51: 104-108.

DOI：10.1016/j.cemconres.2013.04.012

• Hydration
• Calcium-Silicate-Hydrate (C-S-H)
• Ca3SiO5
• Quasielastic Neutron Scattering (QENS)

New information on the water bonding during the first 36 h of hydration of tricalcium silicate was obtained using the high neutron flux at the sample position of the time-of-flight spectrometer (TOFTOF), FRM II in Garching, Germany, together with Si-29 NMR and X-ray diffraction measurements. A rapid increase in the amount of constrained water was observed at the beginning of the induction period. This is attributed to the formation of an early C-S-H with a large specific surface area (around 800 m(2)/g). During subsequent hydration, the amount of constrained water, as given by the total surface area of the hydration products, is controlled by (a) the formation of new metastable early C-S-H which increases total surface area and (b) polymerisation processes which reduce total surface area. The relative contribution of these processes varies during hydration.

• 出版日期2013-9