The basics to the most advanced and important details about Alkali-Silica Reactivity (ASR) are highlighted in this book. These specific details, organized in alphabetical order, are illustrated and explained. The ultimate objective of this book is to function as an educational tool that not only tells, but shows the story of ASR and how it has become one of the primary mechanisms of premature concrete failure.The educational information in the book is geared towards real-world/field concrete applications. The fundamental mechanisms of ASR will be showcased: aggregate interface interactions, soluble alkalis, the type of tests used to measure the impact of ASR. This book focuses on novel technologies including, additives and admixtures for ASR mitigation that ensure a higher resistance to chemical and physical attack for a longer concrete service-life. The aim of this book is to give the Contractors, Concrete Practitioners, Architects, and Engineers information to help them make better-informed decisions on ASR mitigation in concrete.