Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by function]
6. building materials
7. [masonry and masonry units]
8. masonry units

Additional parents:

1. top of the aat hierarchies
2. Materials Facet
3. Materials
4. materials
5. materials by function
6. building materials
7. construction block

Anotations

Scope note:

Large units of building material made from a mixture of cement and an aggregate, usually 8 x 16 inches and of various thicknesses. A mixture of cement, aggregate, and water is vibrated and compacted in steel molds and then cured in air, steam, or under autoclaving processes. Became a very popular building material beginning in the early 20th century.