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

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 {sup 29}Si 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{sup 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.
Authors:
 [1] ; ;  [1] ;  [2]
  1. Centre for Building Materials (CBM), Technische Universität München, Baumbachstraße 7, 81245 Munich (Germany)
  2. Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II), Technische Universität München, Lichtenbergstraße 1, 85748 Garching (Germany)
Publication Date:
OSTI Identifier:
22220809
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 51; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; CALCIUM SILICATES; FRM-II REACTOR; HYDRATES; HYDRATION; NEUTRON FLUX; NEUTRON REACTIONS; NUCLEAR MAGNETIC RESONANCE; POLYMERIZATION; QUASI-ELASTIC SCATTERING; SILICON 29; SPECIFIC SURFACE AREA; SURFACE AREA; TIME-OF-FLIGHT SPECTROMETERS; X-RAY DIFFRACTION