7-16 The stone, which shall be similar to railroad ballast, shall m eet the following gradation requirements: Sieve Designation Percentage by Weight Passing Square Mesh Sieves 2½ inch 100 2 inch 95-100 1 inch 0-30 ¾ inch 0-5
703.32 Definitions (ASTM D 2488, Table 1).
Angular: Particles have sharp edges and relatively plane side s with unpolished surfaces Subrounded: Particles have nearly plane sides but have well-ro unded corners and edges Rounded: Particles have smoothly curved sides and no edges
703.33 Stone Ballast Aggregate for stone ballast shall b e clean and graded crushed
stone aggregate with a hard, dense angular particle structure p roviding sharp corners and cubicle fragments with prime c onsideration for drainage efficie ncy. The material retained on the ⅜ inch sieve shall contain n ot more than 5 percent, by weight of flat and elongated particles when performed in accord ance with test method ASTM D 4791, Flat Particles, Elongated Particles, or Flat and E longated Particles in Coarse Aggregate, using a dimensional ratio of 1:5. The material shall have an absorption no greater than 1.5 percent by weight and a bulk specific gravity of 2.60 or greater as determined in accor dance with AASHTO T 85 modified for weight of sample. The material shall not exceed 30 percent loss on ASTM C53 5, Resistance to Degradation of Large-Size Coar se Aggregate by Abrasion and Impa ct in the Los Angeles Machine. The material shall meet the grading requirements of the f ollowing table: Sieve Designation Percentage by Weight Passing Square Mesh Sieves Type 4 Type 4A 2 ½ inch 100 2 inch 100 90-100 1 ½ inch 90-100 60-90 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
Source: Maine Standard Specifications for Road and Bridge Construction, 2020 Edition. Pages 721–722 of 817.