7-17 1 inch 20-55 10-35 ¾ inch 0-15 0-10 3/8 inch 0-5 0-3 No. 200 1.0 max. 1.0 max. 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 wid th 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. SECTION 705 - JOINT MATERIAL 7-18
705.01 Preformed Expansion Joint Filler Preformed expansion j oint filler shall be
non-extruding and resilient bituminous type and shall conform t o the requirements of AASHTO M 213.
705.02 Joint Mortar Joint mortar shall consist of 1 part Port land cement, 2 parts
sand and sufficient water to obtain the required consistency. Mortar shall be used within 30 minutes after its preparation. The cement shall conform to the requirements of Portland cemen t AASHTO M 85, Type II or IIA. The sand shall meet the requirements of the following table: Sieve Designation Percentage by Weight Passing Square Mesh Sieves Joints Thicker Than ½ inch Joints ½ inch or Thinner ⅜ inch 100 - ¼ inch - 100 No. 4 95-100 - No. 8 70-95 85-100 No. 16 45-80 60-90 No. 30 25-55 35-70 No. 50 10-30 15-45 No. 100 2-10 0-15 No. 200 0-5.0 0-5.0 When necessary, material retained on the No. 4 sieve may be rem oved. The sand shall be subjected to the colorimetric test for organ ic impurities, AASHTO T 21, and when a color darker than t he reference standard color solution (laboratory designation Plate III) is produced, the material shall be rejec ted.
705.03 Flexible Watertight Gaskets Flexible gaskets, either r ubber or plastic, shall
conform to ASTM C990. SECTION 706 - NON-METALLIC PIPE
706.02 Reinforced Concrete Pipe This pipe shall conform to th e requirements of
AASHTO M 170M/M 170. Elliptical pipe shall conform to the requ irements of AASHTO M 207M/M 207. Unless otherwise specified, pipe wall design and use of elliptical reinforcement in circular pipe are optional. Pipe arch shall c onform to the requirements of AASHTO M 206M/M 206.
Source: Maine Standard Specifications for Road and Bridge Construction, 2020 Edition. Pages 722–723 of 817.