Dense-Graded

A dense-graded mix is a well-graded HMA mixture intended for general use. When properly designed and constructed, a dense-graded mix is relatively impermeable. Dense-graded mixes are generally referred to by their nominal maximum aggregate size. They can further be classified as either fine-graded or coarse-graded. Fine-graded mixes have more fine and sand sized particles than coarse-graded mixes (see Table 1 for definitions of fine- and coarse-graded mixes).

Purpose

Dense-graded mixes are suitable for all pavement layers and for all traffic conditions. They work well for structural, friction, leveling and patching needs.

Materials

Well-graded aggregate, asphalt binder (with or without modifiers), RAP

Mix Design

Superpave, Marshall or Hveem procedures.

Other Information

Particulars about dense-graded HMA are covered by flexible pavement sections in the rest of this Guide.

 

Table 1: Fine- and Coarse-Graded Definitions for Dense-Graded HMA (from NAPA, 2001)
Mixture Nominal Maximum Aggregate Size Coarse-Graded Mix Fine-Graded Mix
37.5 mm (1.5 inches) < 35 % passing the 4.75 mm (No. 4 Sieve) > 35 % passing the 4.75 mm (No. 4 Sieve)
25.0 mm (1.0 inch) < 40 % passing the 4.75 mm (No. 4 Sieve) > 40 % passing the 4.75 mm (No. 4 Sieve)
19.0 mm (0.75 inches) < 35 % passing the 2.36 mm (No. 8 Sieve) > 35 % passing the 2.36 mm (No. 8 Sieve)
12.5 mm (0.5 inches) < 40 % passing the 2.36 mm (No. 8 Sieve) 40 % passing the 2.36 mm (No. 8 Sieve)
9.5 mm (0.375 inches) < 45 % passing the 2.36 mm (No. 8 Sieve) > 45 % passing the 2.36 mm (No. 8 Sieve)