Pennsylvania Publication 408 — Specifications — Section 482

481.1 481.4 (b) AGGREGATE

481.1DESCRIPTION —This work is two applications of asphalt material, each immediately followed by an

application of precoated aggregate.

481.2MATERIAL —

(a)Asphalt Precoated Material . Section 471.2(a)

(b)Asphalt Material. Section 471.2(b)

(c)Coarse Aggregate. Section 480.2(b)

(d)Preparation of Precoated Aggregate. Section 471.2(d)

481.3CONSTRUCTION —Section 480.3

481.4MEASUREMENT AND PAYMENT —

(a)Area Basis . Square Yard

(b)Material Used Basis.

1.Coarse Aggregate. Square Yard

The unit price includes the asphalt precoating material.

2.Asphalt Material. Gallon

482.1 482.2(e)

482.1DESCRIPTION —This work is construction of a n emulsified asphalt slurry seal course of the type

designated.

482.2MATERIAL —

(a)Emulsified Asphalt Material. Emulsified Asphalt, Class SS -1h, or CSS-1h, Section 702.

(b)Fine Aggregate. Section 703.1

Provide aggregate with the SRL designation in the Contract Item. Supply the aggregate from an acceptable source for use in wearing courses. The Contractor may supply an aggregate or aggregate blend with an SRL equal to or better than in the Contract Item. Blends are 50% by weight of each aggregate. Mix aggregates by an approved method.

(c)Filler. Section 703.1(c)1

(d)Water. Section 720.2, and free from harmful soluble salts. If water exceeds 150 ppm (9 grains)

hardness, lower to below 150 ppm (9 grains) by adding water softener.

(e)Mixture Composition. Design and test the slurry seal mixture according to ASTM D3910 .

Provide fine aggregate, asphalt emulsion, water, and, if required, filler conforming to the Representative directed composition by weight percentages that are within the limits of Table A.

TABLE A Composition by Weight Percentages Combined Aggregate Gradations

Percentages by Weight Passing Sieve Type I Type II Type III

3/8-inch 100 100 100 No. 4 100 90 - 100 70 - 90 No. 8 90 - 100 65 - 90 45 - 70 No. 16 65 - 90 45 - 70 28 - 50 No. 30 40 - 60 30 - 50 19 - 34 No. 50 25 - 42 18 - 30 12 - 25 No. 100 15 - 30 10 - 21 7 - 18 No. 200 10 - 20 5 - 15 5 - 15

Asphalt Residue Percent by Weight of Dry Aggregate 10.0 - 16.0 7.5 - 13.5 6.5 - 12.0

1.Type I. Use to seal cracks, fill voids, and correct surface erosion. Apply dry aggregate at a rate

from 6 pounds per square yard to 10 pounds per square yard.

2.Type II. Use to fill surface voids, correct severe surface erosion conditions, and provide a minimum

wearing surface. Apply dry aggregate at a rate of 10 pounds per square yard to 15 pounds per square yard.

3.Type III. Use to provide a ne

Source: Pennsylvania Department of Transportation Specifications, 2026 Edition. Pages 333–337 of 1,522.

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481 ASPHALT SURFACE TREATMENT USING PRECOATED AGGREGATE

483 POLYMER-MODIFIED EMULSIFIED ASPHALT PAVING SYSTEM (MICRO SURFACING)