Hierarchy classification:

1. top of the aat hierarchies
2. Activities Facet
3. Processes and Techniques (hierarchy name)
4. [processes and techniques by specific type]
5. physicochemical processes

Anotations

Scope note:

Materials-related distress arising from a simple acid-base reaction between alkali hydroxyl ions in portland cement and siliceous minerals. Found in many aggregates, it results in premature deterioration of concrete structures including bridges, dams, and pavements.