Alkali-silica reaction (ASR) continues to be a concrete durability problem despite the many physical and chemical mitigation techniques known to successfully prevent it. The research presented herein tested a new method to limit ASR: aggregate passivation. A lithium silicate layer was created on reactive natural siliceous aggregate surfaces by treating the aggregates in a lithium hydroxide solution prior to use. A 4 M LiOH treatment was found to be superior to a 2 M LiOH treatment in producing a lithium silicate passivation layer and in reducing expansion due to ASR. The use of passivated aggregates greatly reduced expansion in accelerated mortar bar tests compared to nonpassivated aggregates and lithium-based admixtures.
|Original language||English (US)|
|Number of pages||9|
|Journal||ACI MATERIALS JOURNAL|
|State||Published - 2013|
Bibliographical noteKAUST Repository Item: Exported on 2021-09-21
Acknowledged KAUST grant number(s): KUS-11-004021
Acknowledgements: This publication was based on work supported in part by the National Science Foundation (Grant No. CMMI 0448983), King Abdullah University of Science and Technology (KAUST) (Award No. KUS-11-004021), and the first author was supported by the Berkeley Fellowship for Graduate Study.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.