While ASTM standards are not referenced in the definitions, they can provide a reasonable guide to assist in determining inclusion and exclusion.
In general, units complying with the following specs are included: C 90 Loadbearing Concrete Masonry Units, C129 Nonloadbearing Concrete Masonry Units, C744 Prefaced Concrete Units, C1634 Concrete Facing Brick and Other Concrete Masonry Facing Units, C1790 Fly Ash Facing Brick.
In general, units complying with the following specs are excluded: C55 Concrete Building Brick, C139 Catch Basin and Manhole Units, C216 Facing Brick (Solid Masonry Units Made from Clay or Shale), C652 Hollow Brick (Hollow Masonry Units Made from Clay or Shale), C936 Solid Concrete Interlocking Paving Units, C1372 Dry-Cast Segmental Retaining Wall Units, C1623 Manufactured Concrete Masonry Lintels, C1670 Adhered Manufactured Stone Masonry Veneer Units, C1691 Unreinforced Autoclaved Aerated (AAC) Concrete Masonry Units, C1782 Segmental Concrete Paving Slab, C1884 Concrete Ballast Block, C1877 Adhered Concrete Masonry Units.
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