TY - JOUR
T1 - Single-crystal elastic constants of natural ettringite
AU - Speziale, Sergio
AU - Jiang, Fuming
AU - Mao, Zhu
AU - Monteiro, Paulo J. M.
AU - Wenk, Hans-Rudolf
AU - Duffy, Thomas S.
AU - Schilling, Frank R.
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The research was supported in part by the NSF (062464) and the Carnegie-DOE Alliance Center (CDAC). S.S. has been supported by Miller Institute for Basic Research in Science at the University of California at Berkeley during the initial stages of the project. P.J.M.M. and H.R.W. appreciate support from KAUST.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
PY - 2008/7
Y1 - 2008/7
N2 - The single-crystal elastic constants of natural ettringite were determined by Brillouin spectroscopy at ambient conditions. The six non-zero elastic constants of this trigonal mineral are: C11 = 35.1 ± 0.1 GPa, C12 = 21.9 ±0.1 GPa, C13 = 20.0 ± 0.5 GPa, C14 = 0.6 ± 0.2 GPa, C33 = 55 ± 1 GPa, C44 = 11.0 ± 0.2 GPa. The Hill average of the aggregate bulk, shear modulus and the polycrystal Young's modulus and Poisson's ratio are 27.3 ± 0.9 GPa, 9.5 ± 0.8 GPa, 25 ± 2 GPa and 0.34 ± 0.02 respectively. The longitudinal and shear elastic anisotropy are C33/C11 = 0.64 ± 0.01 and C66/C44 =0.60 ± 0.01. The elastic anisotropy in ettringite is connected to its crystallographic structure. Stiff chains of [Al(OH)6]3- octahedra alternating with triplets of Ca2+ in eight-fold coordination run parallel to the c-axis leading to higher stiffness along this direction. The determination of the elastic stiffness tensor can help in the prediction of the early age properties of cement paste when ettringite crystals precipitate and in the modeling of both internal and external sulfate attack when secondary ettringite formation leads to expansion of concrete. © 2008 Elsevier Ltd. All rights reserved.
AB - The single-crystal elastic constants of natural ettringite were determined by Brillouin spectroscopy at ambient conditions. The six non-zero elastic constants of this trigonal mineral are: C11 = 35.1 ± 0.1 GPa, C12 = 21.9 ±0.1 GPa, C13 = 20.0 ± 0.5 GPa, C14 = 0.6 ± 0.2 GPa, C33 = 55 ± 1 GPa, C44 = 11.0 ± 0.2 GPa. The Hill average of the aggregate bulk, shear modulus and the polycrystal Young's modulus and Poisson's ratio are 27.3 ± 0.9 GPa, 9.5 ± 0.8 GPa, 25 ± 2 GPa and 0.34 ± 0.02 respectively. The longitudinal and shear elastic anisotropy are C33/C11 = 0.64 ± 0.01 and C66/C44 =0.60 ± 0.01. The elastic anisotropy in ettringite is connected to its crystallographic structure. Stiff chains of [Al(OH)6]3- octahedra alternating with triplets of Ca2+ in eight-fold coordination run parallel to the c-axis leading to higher stiffness along this direction. The determination of the elastic stiffness tensor can help in the prediction of the early age properties of cement paste when ettringite crystals precipitate and in the modeling of both internal and external sulfate attack when secondary ettringite formation leads to expansion of concrete. © 2008 Elsevier Ltd. All rights reserved.
UR - http://hdl.handle.net/10754/599634
UR - https://linkinghub.elsevier.com/retrieve/pii/S0008884608000471
UR - http://www.scopus.com/inward/record.url?scp=44149083271&partnerID=8YFLogxK
U2 - 10.1016/j.cemconres.2008.02.004
DO - 10.1016/j.cemconres.2008.02.004
M3 - Article
SN - 0008-8846
VL - 38
SP - 885
EP - 889
JO - Cement and Concrete Research
JF - Cement and Concrete Research
IS - 7
ER -