Determination of the elastic properties of amorphous materials: Case study of alkali–silica reaction gel |
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| Affiliation: | 1. Civil Engineering Program, Department of Mechanical Engineering, State University of New York at Stony Brook, NY 11794, USA;2. Deutsches GeoForschungsZentrum GFZ, Telegrafenberg, 14473 Potsdam, Germany;3. Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720, USA;4. Department of Civil Enginnering, Middle East Technical University, 06800 Ankara, Turkey;5. Advanced Light Source, Lawrence Berkeley Laboratory, Berkeley, CA 20015, USA;6. Department of Earth and Planetary Sciences, Macquarie University, North Ryde, NSW 2109, Australia;1. Dept. of Civil Engineering Science, University of Johannesburg, Auckland Park Kingsway Campus, P.O. Box 524, Auckland Park 2006, Johannesburg, South Africa;2. Dept. of Civil Engineering, University of Toronto, 35 St. George St., Toronto, ON M5S 1A4, Canada |
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| Abstract: | The gel formed during alkali–silica 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. |
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