903 MASONRY PRODUCTS

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903.01 SEWER BRICK.
M 91, Grade SMUnified Soil Classification System term for Silt, with a standard size of 2-1/4 x 3-3/4 x 8 in.
903.02 MANHOLE BRICK.
M 91, Grade MS.
903.03 BUILDING BRICK.
M 114, Grade SW.
903.04 HOLLOW CONCRETE MASONRY BLOCK.
C 90, Grade N, Type I, normal weight.
903.05 SOLID CONCRETE MASONRY BLOCK.
C 139.
903.06 MORTAR FOR MASONRY.
Composed in accordance with one of the following:
(a) One part portland or blended cement and three parts mortar sand by dry loose volume and hydrated lime not to exceed 20 percent of the cement by weight.
(b) One part masonry cement and three parts mortar sand by dry loose volume.
(c) Prepared bag mixes consisting of masonry cement and mortar sand. The prepared mixes shall produce a minimum compressive strength of 500 psi in seven days when tested using the applicable procedures specified in C 91.
Materials for mortar shall meet the following:
Mortar Sand       901.01
Portland Cement       902.03
Blended Cement       902.04
Masonry Cement       902.05
Water       921.01
Lime       921.03