The Alkali-Silica Reaction (ASR) causes expansion and cracking in concrete which can result in structural problems in concrete infrastructure. ASR gel, formed from a chemical reaction between certain minerals in some aggregates and alkalis in concrete pore solution, is commonly viewed as the origin of swelling pressure that causes damage. A better understanding of the ASR reaction and its mechanisms is key to determining solutions that will prolong the life of concrete infrastructure. This brief summarizes an atomistic modeling study that is meant to better connect ASR gel’s chemical composition to its mechanical properties and swelling characteristics. Read more.