Abstract
Alkali–silica reaction (ASR) is a severe concrete deterioration durability issue that has been recognized for over 80 years. With decades of research around the world, the ability to properly prevent ASR in new concrete is still a conundrum. Both North American and Europe have test methods that are similar, but each have their own variations due to some test methods work better in certain regions. Over the years, test methods have been showing improvement, but the ideal job mixture test method is still absent. The ability to link test methods to field concrete has become an important trend in both regions. Moreover, both North American and Europe in recent decades have developed ASR guidelines to help determine aggregate reactivity and proper prevention of ASR. This paper gives an overview and discusses sources of errors and challenges during laboratory testing, and recommendations for improving the reliability of ASR testing are given.