2.02 BRICK MATERIALS:
A. — Brick shall be sound, hard, and uniformly burned brick, regular and uniform in shape and size, of
compact texture, and satisfactory to the Engineer. Bricks shall comply with ASTM C32, for Grade
SS, hard brick, except that the mean of five tests for absorption shall not exceed 8 percent by
weight.
B. — Rejected brick shall be immediately removed from the work and brick satisfactory to the
Engineer substituted.
C. Mortar shall be composed of portland cement, hydrated lime, and sand in which the volume of sand
shall not exceed three times the sum of the volumes of cement and lime. The proportions of
cement and lime shall be as directed and may vary from 1:1/4 for dense hard-burned brick to
1:3/4 for softer brick. In general, mortar for Grade SS Brick shall be mixed in the volume
proportions of 1:1/2:4-1/2; portland cement to hydrated lime to sand.
D. Cement shall be Type II portland cement as specified for concrete masonry.
E. Hydrated lime shall be Type S conforming to ASTM C207.
F. The sand shall comply with ASTM C144 specifications for "Fine Aggregate," except that all of the
sand shall pass a No. 8 sieve.
2.03 FRAMES, GRATES AND COVERS:
A. Castings shall be of good quality, strong, tough, even-grained cast iron, smooth, free from scale,
lumps, blisters, sandholes, and defects of every nature which would render them unfit for the service
for which they are intended. Contact surfaces of covers and frame seats shall be machined to
prevent rocking of covers.
B. _ Allcastings shall be thoroughly cleaned and may be subject to a careful hammer inspection at the
Engineer's discretion.
C. Castings shall be ASTM A48 Class 30B or better.
D. The surface of the manhole covers shall have a diamond pattern with the cast words
"DRAIN" or "SEWER," whichever 1s appropriate.
E. Manhole frames shall be 6-inch height with 32-inch covers for 30-inch openings, 370 pounds
minimum by EJIW, No. LA326-5-000 or approved equal.
G. Catch basin castings shall be NHDOT Standard 3-sided 8-inch frame with Alternate Grate - Type
B or approved equal.
H. — Catch basin frames set against curbing shall have three flanges only.
2022 Sewer Replacement Project Precast Manholes and Catch Basins
Nashua, NH 02631-4
