Determination of the elastic properties of amorphous materials: case study of alkali-silica reaction gel
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Date
2013-12-01
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
The gel formed during Brillouin spectroscopy reaction (ASR) can lead to cracking and deterioration of a concrete structure. The elastic properties of the ASR gel using X-ray absorption and Brillouin spectroscopy measurements are reported. X-ray absorption was used to determine the density of the gel as a function of pressure, and the result yields an isothermal bulk modulus of 33 ± 2 GPa. Brillouin spectroscopy was applied to measure isentropic bulk (24.9–34.0 GPa) and shear moduli (8.7–10.1 GPa) of the gel. The range of values obtained is attributed to the variable composition of samples that were collected under field conditions. Results suggested that amorphous silica becomes expanded and compressible as it absorbs water molecules and alkali ions. This could explain high gel migration rates through the complex pore structures in concrete. © 2013, Elsevier Ltd.
Description
Keywords
Elasticity, X-ray diffraction, Gels, Pore structure, Concretes, Silica, Amorphous state, Brillouin effect
Citation
Moon, J., Speziale, S., Meral, C., Kalkan, B., Clark, S. M., & Monteiro, P. J. M. (2013). Determination of the elastic properties of amorphous materials: Case study of alkali-silica reaction gel. Cement and Concrete Research, 54, 55-60. doi:10.1016/j.cemconres.2013.08.012