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Masonry =
Art and craft of laying masonry units of brick,
concrete block, glass block, structural tile, and
stone. Also construction of units of such
materials as clay, shale, concrete, glass, gypsum,
or stone, set in mortar. The following are
different types of masonry: 1. Hollow masonry-
units in which the voids exceed 25% of the
cross-sectional area; 2. Solid masonry-units in
which the voids do not exceed 25% of the cross-
sectional area at any plane parallel to the bearing
surface; and 3. Modular masonry-units
manufactured to a nominal four-inch module size
or a multiple of four inches.
Mortar =
Plastic mixture of cementitious materials, sand
(aggregate) and water; used as a bed and for
cementing masonry units in place. Also called
mud.
Mortar types:
Type S =
1 part Portland Cement
1/2 part Hydrated Lime
4 1/2 parts sand
or
1 part Type II masonry cement
4 1/2 parts sand
Type M =
1 part Portland Cement
1/4 part Hydrated Lime
3 parts of sand
or
1 part Type II Cement
6 parts sand