Attachment 3 Aggregate Specs.pdf

PART 2.2

AGGREGATES FOR GRANULAR BASES AND SURFACING

GENERAL REQUIREMENTS

The material shall conform to the specifications for the particular material required by the contract. The material shall be sound durable particles of ledge rock, gravel, recycled concrete pavement (RCA) removed from within the project limits, and sand. The material may include limited amounts of fine soil particles, but shall be free of vegetation or organic debris, paper, metal, glass, and other foreign material.

SPECIFIC REQUIREMENTS

Aggregates for granular bases and surfacing shall conform to the requirements of Table 1.

TABLE 1

REQUIREMENT

Subbase

Gravel

Cushion

Aggregate Base

Course

Limestone Ledge Rock

Gravel

Surfacing

Pit

Run

Granular Bridge End

Backfill Base Course

Gravel Cushion

Sieve Percent Passing

6 inch 100

2 inch 100

1 inch 70-100 100 100 100 100 100

3/4 inch 80-100 80-100 80-100 80-100 100 80-100

1/2 inch 68-91 68-91 68-90 68-90 68-91

#4 30-70 46-70 46-70 42-70 42-70 50-78 0-60 38-70

#8 22-62 34-58 34-58 29-53 29-53 37-67 28-58

#40 10-35 13-35 13-35 10-28 10-28 13-35 10-35

#200 0.0-15.0 3.0-12.0 3.0-12.0 3.0-12.0 3.0-12.0 4.0-15.0 0-20.0 0.0-5.0

Other Properties

Liquid Limit (max) 25 25 25 25 25

Plasticity Index 0-6 0-6 0-6 0-3 0-3 4-12 0-6

LA Abrasion Loss (maximum) 50 40 40 40 40 40 40

Crushed Particles (minimum) +#4 Sieve

30% 1-CF

Foot Notes *2 *1 *2 ' *3

*1 The fraction passing the #200 sieve shall not be greater than 2/3 of the fraction passing the #40 sieve. In no case shall the upper limit specified for the #200 sieve be exceeded.

*2 Requirements apply to ledge rock other than limestone ledge rock.

*3 Acceptance of pit run will be by visual inspection. The Engineer may require a sieve analysis to verify the material meets the specified gradation. Independent Assurance will not be required.

Adapted from the 2015 South Dakota DOT Standard Specifications for Roads and Bridges, Section 882.