All concrete masonry units shall
comply with ASTM C90-02, as manufactured by Capitol Concrete Products, Co., Topeka, Kansas.
If you want “Lightweight Blocks”
(in this locality commonly known as “Haydite Blocks”),
specify that the aggregate shall meet ASTM C331.
If you want “Normal Weight”
blocks (in this locality commonly known as “Concrete
Blocks”), specify that the aggregate shall meet
For Split Face and/or Colored Block, add that they shall
be manufactured with an integral water repellant, and
the mortar used with them shall contain a water repellant.
When using Split Face and/or Colored
Block add that blocks from two or more cubes shall be
mixed as they are being laid to assure that color and/or
face variations will be divided.