Experimental determination of bulk modulus of 14 angstrom tobermorite using high pressure synchrotron X-ray diffraction
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- Experimental determination of bulk modulus of 14 angstrom tobermorite using high pressure synchrotron X-ray diffraction
- Oh, Jae Eun; Clark, Simon M.; Wenk, Hans-Rudolf; Monteiro, Paulo J. M.
- C-S-H (B); Calcium silicate hydrate; Compression behavior; Diamond-anvil cell; Experimental determination; High pressure; High pressure study; Hydrostatic conditions; In-plane; Interlayer spacings; Structural analogue; Structural defect; Synchrotron x ray diffraction; Tobermorite; Water molecule
- Issue Date
- PERGAMON-ELSEVIER SCIENCE LTD
- CEMENT AND CONCRETE RESEARCH, v.42, no.2, pp.397 - 403
- Using a diamond anvil cell, 14 angstrom tobermorite, a structural analogue of calcium silicate hydrates (C-S-H), was examined by high-pressure synchrotron X-ray diffraction up to 4.8 GPa under hydrostatic conditions. The bulk modulus of 14 angstrom tobermorite was calculated, K-o = 47 GPa. Comparison of the current results with previous high pressure studies on C-S-H(I) indicates that: (1) the compression behavior of the lattice parameters a and b of 14 angstrom tobermorite and C-S-H(I) are very similar, implying that both materials may have very similar Ca-O layers, and also implying that an introduction of structural defects into the Ca-O layers may not substantially change in-plane incompressibility of the ab) plane of 14 angstrom tobermorite: and (2) the bulk modulus values of 14 angstrom tobermorite and C-S-H(I) are dominated by the incompressibility of the lattice parameter c, which is directly related to the interlayer spacing composed of dreierketten silicate chains, interlayer Ca, and water molecules.
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