The Presence of Ettringite in Concrete Affected by alkali‐silica Reaction and its Potential use as Recycled Aggregate

The backscattered electron imaging, energy dispersive x-ray analysis, and x-ray mapping are helpful tools to identify the type of aggregate used in concrete and the presence of alkali-silica reaction products. The study shows the presence of crystalline ettringite in the air voids of the concrete. The formed ettringite is believed to have no direct effect on the deterioration as they form in an empty space without causing swelling pressure on the concrete.