703.13 Aggregate for Cover Coats, Surface Treatments, and Bituminous Preservative Treatment. Cover aggregate for type 2 seal coat shall consist of sand or fine screenings, reasonably free from dirt or organic matter.

Aggregates for type 3 seal coat, surface treatments, or bituminous preservative treatment shall be crushed stone, crushed slag, or crushed or natural gravel. Only one type of aggregate shall be used on the project unless alternative types are approved. Aggregates shall meet the quality requirements of AASHTO M 78.

When tested in accordance with AASHTO T 182, (ASTM D 1664) aggregate shall have a retained bituminous film above 95 percent. Aggregates which do not meet this requirement may be used for bituminous surface treatments and seal coats provided an approved chemical additive or wetting agent is used to provide a water resistant film.

Lightweight aggregate, if required or permitted by the special provisions, shall meet the pertinent requirements of AASHTO M 195.

When crushed gravel is used, not less than 50 percent by weight of the particles retained on the No. 4 sieve (4.75 mm) shall have at least one fractured face. Aggregates shall meet the gradation requirements called for in the bid schedule.

Table 703-7.—Gradation requirements for cover coats

[Percentage by weight passing square mesh sieves AASHTO T 27]

703.14 Blotter. Aggregate for blotter material shall conform to the gradation requirements of AASHTO M 43, (ASTM D 448) Size No. 10. The aggregate shall be free from vegetable or other deleterious material.

703.15 Filler. Filler material for bituminous bases or pavements shall meet the requirements of AASHTO M 17.

703.16 Bed Course Material.

(a) Bed course material for sidewalks, paved waterways, and curbing shall consist of cinders, sand, slag, gravel, crushed stone or other approved material of such gradation that all particles will pass through a sieve having 1⁄2-inch (12.5 mm) square openings.

(b) Bed course material for slope protection shall be a porous, free

Table 703.8.-Gradation requirements for bituminous
surface treatments

[Percentage by weight passing square mesh sieves, AASHTO T 27]

Grading designation with corresponding size No. from
AASHTO M 43 (ASTM D 448)

Sieve designation

A(No. 5) B(No. 6) C(No. 7) D(No. 8) E(No. 9) F(No.9

draining material consisting of sand, gravel, cinders, slag, crushed stone or other approved free-draining material. This material shall be uniformly graded and of such size that 100 per cent of the material will pass through a sieve having 11⁄2 inch (37.5 mm) square openings.

703.17 Sheathing Material. Sheathing material shall conform to either (a) or (b) below.

(a) Sound, durable particles of gravel, slag, or crushed stone meeting the following gradation:

Sieve

3-inch (75 mm)
No. 4 (4.75 mm).

No. 200 (75 μm).

Percent by weight passing

100
0-10

0-2

(b) Clean noncementitious sand meeting the requirements of subsection 703.01(b).

703.18 Aggregates for Subgrade Modification. The material shall consist of hard, durable particles or fragments of slag, stone, or gravel, screened or crushed to the required size and grading. The material shall be visually free from vegetable matter and lumps or balls of clay and shall meet the requirements for one of the gradings given in table 703-10, whichever is called for in the bid schedule.

Table 703-10.-Grading requirements-Aggregate for subgrade

That portion of the material passing a No. 40 sieve (425 μm) shall have a plasticity index of not over 6, as determined by AASHTO T 90. Crushed slag shall consist of clean, tough, durable pieces of blastfurnace slag, reasonably uniform in density and quality and reasonably free from glassy pieces.

703.19 Aggregates for salt stabilization. Aggregates for salt stabilized base courses shall consist of hard durable particles or fragments of slag, stone or gravel, screened or crushed to the required size and grading.

That portion of the material passing a No. 40 (425 μm) sieve shall have a plasticity index of not over 6, as determined by AASHTO T–90. The material shall be visually free from vegetable matter or lumps or balls of clay and shall meet the requirements for one of the gradings given in table 703-11 as called for in the bid schedule.

Table 703-11.-Grading requirements for aggregates for salt stabilized base course

*Gradation varies with top size of material and should be based on size of largest material used. For instance, if largest size is 2", gradation should be under heading B; if I", under A."

Section 704.-MASONRY UNITS

704.01 Clay or Shale Brick. Brick shall conform to the requirements of one of the following specifications:

Sewer Brick-AASHTO M 91, Grade SM.

Sewer Brick-ASTM C 32, Grade SM.

Building Brick-AASHTO M 114, Grade SW, or ASTM C 62,
Grade SW

The grade will be shown on the plans or in the special provisions. 704.02 Concrete Brick. Concrete brick shall conform to the requirements of ASTM C 55, Grade A.

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 shall conform with the requirements of ASTM C 139 or ASTM C 145, grade as specified. Hollow blocks shall conform to the requirements of ASTM C 90, grade as specified.

Dimensions and tolerances shall be as individually specified on the plans.

Section 705.—JOINT MATERIALS

705.01 Joint Fillers. Poured filler for joints shall conform to the requirements of AASHTO M 173 (ASTM D 1190).

Preformed fillers for joints shall conform to the requirements of AASHTO M 33 (ASTM D 994), AASHTO M 153 (ASTM D 1752), AASHTO M 213 (ASTM D 1751), AASHTO M 220, as specified, and shall be punched to admit the dowels where called for on the plans. The filler for each joint shall be furnished in a single piece for the depth and width required for the joint unless otherwise authorized by the Engineer. When the use of more than one piece is authorized for a joint, the abutting ends shall be fastened securely, and held accurately to shape, by stapling or other positive fastening satisfactory to the Engineer.

705.02 Joint Mortar. Pipe joint mortar shall consist of one part portland cement and two parts approved sand with water as necessary to obtain the required consistency. Portland cement and sand shall conform respectively to subsections 701.01 and 703.01(a). If shown in the special provisions, air entrainment shall be provided. Mortar shall be used within 30 minutes after its preparation.

705.03 Rubber Gaskets. Ring gaskets for rigid pipe shall conform to the requirements of AASHTO M-198. Continuous flat gaskets for flexible metal pipe shall conform to the requirements of ASTM D 1056 with grade SCE 41 used for bands with projections, or flat bands and