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Direct synthesis of a solid calcium-silicate-hydrate (C-S-H)

DOI: 10.1016/j.conbuildmat.2019.06.024 DOI Help

Authors: Riccardo Maddalena (Cardiff University; University Of Strathclyde) , Kefei Li (Tsinghua University) , Philip A. Chater (Diamond Light Source) , Stefan Michalik (Diamond Light Source) , Andrea Hamilton (University of Strathclyde)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Construction And Building Materials , VOL 223 , PAGES 554 - 565

State: Published (Approved)
Published: October 2019
Diamond Proposal Number(s): 12533

Abstract: We present new results on solid (monolithic) synthetic C-S-H made at room temperature from easily obtainable calcium sources (calcium oxide, calcium hydroxide) and nanosilica (w/s = 2) with a 2 minute mixing time. Using synchrotron X-ray diffraction combined with TGA/DSC, 29Si NMR and synchrotron pair distribution function (PDF) data we show that the solid C-S-H is crystallographically similar to the more conventionally made synthetic C-S-H slurry. We show that C-S-H is present after 1 day curing (C/S = 0.81) and no X-ray visible portlandite is present at day 3. PDF data shows that the ordered domain size is 2.5 – 4.5 nm, depending on the fit chosen.

Journal Keywords: Calcium-silicate-hydrate (C-S-H); Characterization; Thermal analysis; X-ray diffraction

Subject Areas: Engineering, Materials

Instruments: I12-JEEP: Joint Engineering, Environmental and Processing , I15-1-X-ray Pair Distribution Function (XPDF)