Alkali–silica reaction (ASR) occurs in some concretes between the highly alkaline pore solution and reactive silica components of certain aggregates. An alkali-silica gel forms that may expand over time in the presence of sufficient moisture. This expansion can generate internal stresses that lead to deformation of concrete and, possibly, cracking and structural failure. This brief discusses research which adapts existing CSHub models to allow examination of a potential swelling mechanism for ASR. The researchers’ ultimate aim is to develop a model that explains the reaction from the atomic- to meso- scale. MORE.