Studies on electrochemical lithium migration for remediation of Alkali-Silica reaction at macro level in concrete structures
conference paper
Alkali-silica reaction (ASR) is a deleterious mechanism known to affect several concrete structures worldwide. During this process, alkali-ions present in the pore solution react with reactive components of the aggregate particle and, as a result a hygroscopic gel is formed. The produced gel absorbs water from the surrounding cement paste and swells. This process might result in expansion and cracking of the concrete. Lithium ions are known to combine with the alkalisilica gel, forming a non-expansive gel. In fresh mixtures, they may be incorporated by the use of lithium based admixtures. However, in existing concrete structures, the ions need to be transported into the cementitious matrix. The ionic migration seems to be more effective than other transport mechanisms, such as diffusion or absorption, reaching higher penetration depths. Nevertheless, little is known on the transport mechanisms involved or on the effects of lithium migration on ASR. In this paper, a review on current literature on lithium migration as a possible ASR mitigation procedure is presented.
TNO Identifier
466714
ISBN
978-951-38-7899-3
Publisher
VTT Technical Research Centre of Finland
Source title
Proceedings of the Fifth International PhD Student Workshop on Durability of Reinforced Concrete, from Composition to Service Life Design
Editor(s)
Ferreira, R.M.
Gulikers, J.
Andrade, C.
Gulikers, J.
Andrade, C.
Place of publication
Espoo
Pages
50-62
Files
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