No intermediate sizes of aggregate shall be removed for other purposes without written consent of the Engineer.

If crushed gravel is used, not less than 50 percent by weight of the material retained on the No. 4 sieve shall be particles having at least one fractured face.

That portion of the composite material passing a No. 4 sieve shall have a sand equivalent of not less than 35, as determined by AASHTO T 176, Alternate Method No. 2.

The aggregate shall show a durability index not less than 35 (coarse and fine) as determined by AASHTO T 210.

The material shall be free of clay balls and adherent films of clay or other matter that would prevent thorough coating with the bituminous material.

703.09 Aggregate for Hot Plant-Mix Bituminous Pavement. The provisions of subsection 703.07(a) and (b) shall apply and (c) shall apply to wearing courses as appropriate. The several aggregate fractions for the mixture shall be sized, graded, and combined in such proportions that the resulting composite blend meets one of the grading requirements of table 703-4 as specified in the bid schedule.

The gradings to be used will be shown in the special provisions, adjusted to reflect variations in aggregate densities.

The ranges apply to aggregates with bulk specific gravity values that are relatively constant throughout a grading band. When such values vary from sieve to sieve, such as with lightweight aggregates, the ranges for each sieve size shall be adjusted to reflect the variations.

703.10 Aggregate for Cold Plant-Mix Bituminous Pavement. The provisions of subsection 703.07(a) and (b) shall apply.

(a) Aggregate for pavement.-The several aggregate fractions for the mixture shall be sized, graded, and combined in such proportions that the resulting composite blends meet the respective grading requirements of Table 703-5, adjusted to reflect variations in aggregate densities.

(b) Aggregate for top dressing.—The material for the top dressing shall consist of dry sand, stone screenings, or slag screenings so graded that at least 95 per cent shall pass the No. 4 sieve and not more than 40 per cent shall pass the No. 50 sieve.

703.11 Aggregate for Road Mix Bituminous Pavement. Aggregates for road mix bituminous pavement construction shall be crushed stone, crushed slag, or crushed or natural gravel which meet the quality requirements of AASHTO M 62 (1974) or M 63 (1974) for the specified gradation, except that the sodium sulfate soundness loss shall not exceed 12 per

cent.

When crushed gravel is used, at least 50 percent by weight of the particles retained on the No. 4 sieve shall have at least one fractured face. Gradation shall conform to Grading F of table 703-4 in subsection 703.09.

TABLE 703-5

Gradation requirements-Cold plant-mix bitumunous pavement
[Percentage by weight passing square mesh sieves, AASHTO T27]

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 (1974).

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 707.03(d).

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

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.

Sieve designation

14-inch.

1-inch...

3/4-inch.

12-inch.

3/8-inch.

No. 4
No. 8

No. 100

TABLE 703-8

Gradation requirements for bituminous surface treatments

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

(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 parties will pass through a sieve having 1⁄4-inch square openings.

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

(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 of 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.

That portion of the material passing a No. 40 sieve 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 blast-furnace 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 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.

*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 1"', under A.

703.20 Aggregate for Emulsified Asphalt Treated Base. Aggregate shall consist of coarse aggregate of crushed gravel, crushed slag or crushed stone, composed of hard, durable particles or fragments and a filler of finely crushed stone, sand, slag or other finely divided mineral matter. The portion of the material retained on a No. 4 sieve shall be known as coarse aggregate, and that portion passing a No. 4 sieve shall be known as the fine aggregate. The material shall meet the requirement of the following grading:

Percentage by weight passing square mesh sieves, AASHTO T 11 and T 27

Spec. Limits
Grading

A

Tolerance
Limits Grading

100

100

100

95-100

0-7

0-2

0-2

If crushed gravel is used, not less than 65 percent by weight of the coarse aggregate particles retained on a No. 4 sieve shall be particles having at least one fractured face. Coarse aggregate shall have a percent of wear of not more than 35 at 500 revolutions, as determined by AASHTO T 96.

The aggregate shall show a durability factor not less than 35 (coarse and fine) as determined by AASHTO T 210 (Production of Plastic Fines in Aggregates).

The material shall be free of clay balls and adherent films of clay or other matter that would prevent thorough coating with bituminous material.

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.

Preformed fillers for joints shall conform to the requirements of AASHTO M 33 (ASTM D 994), AASHTO M 153, AASHTO M 213, 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.

Joint sealer for granite bridge curb shall be a gray colored joint sealing material conforming to Federal Specifications TT-S-227.

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.