Masonry Magazine July 1978 Page. 15
Concrete Masonry Unit Shapes
Concrete masonry units are available in a wide variety of shapes and sizes to accommodate various construction needs. The use of 6-inch and 8-inch high units is larger than with 3-core units, facilitating placement of steel and grout. Shapes have been developed which make for ease of construction of reinforced walls where the vertical steel is put into position prior to masonry units being laid. These, and other shapes frequently used are shown in the figures that follow. Many of the shapes shown are also manufactured in 4-inch heights, with split or scarred or sculptured faces, and of slump block. Local manufacturers should be consulted as to availability of units.
Figure 5. Double open-end unit or "H" block
This unit was developed for use where fully grouted walls are used. Units are laid up with mortar on horizontal bed joints only; bevelled ends of adjacent units are butted together and grout flows into the recess formed to lock the units together thus eliminating the need for mortared head joints.
Figure 6. Bond-beam unit for use with block shown in Figure 5
This unit can also be used to build the entire wall instead of confining its use to bond-beam courses.
Figure 7. Lintel block
For use in reinforced concrete masonry walls to span over window and door openings. These units are manufactured with heights of 8 inches and 16 inches to accommodate short and long spans.
Figure 8. Block for use where clean-out openings are needed (high-lift grouting)
Scores, or grooves, are cast on the inside of face shells so that portions of the face shells can be easily knocked-out.