SECTION 704 - MASONRY UNITS
704.01 Clay or Shale Brick Except as modified below, brick sh all conform to the
requirements of one of the following specifications: Type of Brick Specification Sewer, Catch Basin and Manhole AASHTO M 91, Grade MS or SM Building AASHTO M 114, Grade SW
704.02 Brick for Paving Brick for paving shall conform to the requirements of
AASHTO M 114 (C62, Grade SW) for Building brick or shale, with the following modifications:
a.The absorption limits shall be from 5 percent to 12 percent for the average of 5 bricks.
b.The compressive strength shall not be less than 6,000 psi.
c.The modulus of rupture shall not be less than 1,000 psi.
d.The bricks shall be No. 1, water struck type for paving. The bricks shall be 2¼ inches by 3¾ inches by 8 inches with pe rmissible variations not to exceed 1/16 inch in depth, ⅛ inch in width and ¼ inch in length. Before ordering new brick, samples shall be submitted in whole straps to show color range.
704.03 Concrete Masonry Blocks Concrete masonry blocks may be rectangular or
segmented and when specified shall have ends shaped to provide interlock at vertical joints. Solid blocks for catch basins and manholes shall conform to th e requirements of ASTM C 139.
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Source: Standard Specifications — Highways and Bridges, 2020 Edition. Pages 722–722 of 817. View official source ↗