Na and Li ion diffusion in modified ASTM C 1260 test by Magnetic Resonance Imaging (MRI)
- MRI Center, Department of Physics, University of New Brunswick, Fredericton, NB (Canada)
- Department of Civil Engineering, University of New Brunswick, Fredericton, NB (Canada)
In the current study, MRI was applied to investigate lithium and sodium ion diffusion in cement paste and mortars containing inert sand and borosilicate glass. Paste and mortars were treated by complying with ASTM C 1260. Lithium and sodium distribution profiles were collected at different ages after different treatments. Results revealed that sodium ions had a greater diffusion rate than lithium ions, suggesting that Na reaches the aggregate particle surface before Li. Results also showed that Na and Li ions had a competitive diffusion process in mortars; soaking in a solution with higher [Li] favored Li diffusion but hindered Na diffusion. In mortars containing glass, a substantial amount of Li was consumed by the formation of ASR products. When [Li] in soaking solution was reduced to 0.37 N, a distinctive Na distribution profile was observed, indicating the free-state Na ions were continuously transformed to solid reaction products by ASR. Hence, in the modified ASTM C 1260 test, [Li] in the storage solution should be controlled at 0.74 N, in order to completely prevent the consumption of Na ions and thus stop ASR.
- OSTI ID:
- 21208380
- Journal Information:
- Cement and Concrete Research, Vol. 38, Issue 12; Other Information: DOI: 10.1016/j.cemconres.2008.06.010; PII: S0008-8846(08)00142-7; Copyright (c) 2008 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
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