Experimental determination of bulk modulus of 14 A tobermorite using high pressure synchrotron X-ray diffraction

Journal Article · Wed Feb 15 00:00:00 EST 2012 · Cement and Concrete Research

DOI:https://doi.org/10.1016/j.cemconres.2011.11.004· OSTI ID:21596958

Oh, Jae Eun ^[1]; Clark, Simon M ^[2]; Wenk, Hans-Rudolf ^[2]

---

1. Department of Civil and Environmental Engineering, University of California, Berkeley, 94720, CA USA (United States)
2. Department of Earth and Planetary Sciences, Maquarie University, Sydney, NSW 2109 (Australia)

Using a diamond anvil cell, 14 A 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 A tobermorite was calculated, K{sub 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 A 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 A tobermorite; and (2) the bulk modulus values of 14 A 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.

• OSTI ID: 21596958
• Journal Information: Cement and Concrete Research, Vol. 42, Issue 2; Other Information: DOI: 10.1016/j.cemconres.2011.11.004; PII: S0008-8846(11)00289-4; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0008-8846
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCIUM SILICATES
COMPRESSION
HYDRATES
LATTICE PARAMETERS
LAYERS
MECHANICAL PROPERTIES
PRESSURE RANGE GIGA PA
WATER
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
COHERENT SCATTERING
DIFFRACTION
HYDROGEN COMPOUNDS
OXYGEN COMPOUNDS
PRESSURE RANGE
SCATTERING
SILICATES
SILICON COMPOUNDS