Where is AAR heading after the 10th International Conference?

A brief overview of research on AAR presented at the 10th AARC is given and new areas of research and future needs are highlighted. Some recent experimental data are presented as examples of details that we would need to understand in order to be able to interpret the effects of parameters such as temperature and chemical environment on the nature of the reactions occurring in the concrete, and on the results of tests carried out to determine the expansion behaviour of aggregates or concrete mixtures. Similar examples are needed for other areas and it appears that understanding AAR and its practical management need further research efforts.