Certain aggregates that are used to make concrete contain amorphous silica. This silica can react with alkalies in the cement paste pore solution and form a gel. This reaction is called alkali-silica reaction (ASR). The gel can expand and put stress on the concrete, potentially contributing to infrastructure failure. In order to understand the mechanisms of ASR and predict the crack formation, it is necessary to collect information on the mechanical properties of the concrete and of the gel. This research brief presents work addressing the mechanical properties of the ASR gel. Read more.